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Zou H, Lai H, Wu W, Cheng R, Lu Y, Peng X. Rapid molecular identification of Rana dybowskii by species-specific primers. Anal Biochem 2024; 692:115548. [PMID: 38697593 DOI: 10.1016/j.ab.2024.115548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 04/09/2024] [Accepted: 04/24/2024] [Indexed: 05/05/2024]
Abstract
Oviductus Ranae is the dried oviduct from Rana dybowskii, a forest frog species with medicinal, tonic, and cosmetic properties. Due to the high price and resource shortage, counterfeit varieties of Oviductus Ranae often appear in the market. However, traditional identification methods cannot accurately differentiate between Oviductus Ranae and its adulterants. In this study, a rapid molecular identification method has been established. The method involves extracting genomic DNA in just 30 s using filter paper purification, species-specific rapid polymerase chain reaction (PCR) amplification, and finally, fluorescence detection of the products. It can accurately identify Oviductus Ranae and its three common adulterants in about 30 min, making the process simple, fast, and highly specific.
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Affiliation(s)
- Heyuan Zou
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, 510006, China.
| | - Huili Lai
- School of Nursing, Guangdong Food and Drug Vocational College, Guangzhou, 510520, China
| | - Wenru Wu
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, 510006, China.
| | - Ruiying Cheng
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, 510006, China
| | - Yaru Lu
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, 510006, China
| | - Xiaoqi Peng
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, 510006, China
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Jia YH, Sun YX, Gao LL, Sun Y, Deng ZP, Li JG, Zhao B, Ji BT. A highly selective and sensitive rhodamine B-based chemosensor for Sn 4+ in water-bearing and biomaging and biosensing in zebrafish. Spectrochim Acta A Mol Biomol Spectrosc 2024; 317:124385. [PMID: 38714005 DOI: 10.1016/j.saa.2024.124385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 04/10/2024] [Accepted: 04/28/2024] [Indexed: 05/09/2024]
Abstract
A novel colorimetric-fluorescent dual-mode chemosensor (JT5) based on rhodamine B has been produced for monitoring Sn4+ in the DMSO/H2O (4:1, v/v) medium. It has high sensitivity, a low detection limit, a short response time (1 s) and high stability, and can still be maintained after two weeks with the red dual fluorescence/ colorimetric response. Enhancement of red fluorescence (591 nm) and red colorimetric (567 nm) response of JT5 by Sn4+ addition. The electrostatic potential of the sensor JT5 molecule was simulated to speculate on the sensing mechanism, and the IR, mass spectrometry and 1H NMR titration were utilized to further demonstrate that JT5 was coordinated to Sn4+ with a 1:1 type, the rhodamine spironolactam ring of JT5 opens up to form a penta-membered ring with Sn4+, meanwhile, its system may have chelation enhanced fluorescence (CHEF) effect. In addition, theoretical calculations were carried out to give the energy gaps of JT5 and [JT5 + Sn4+] as well as to simulate the electronic properties of the maximal absorption peaks. Notably, the sensor JT5 was successfully applied to monitoring Sn4+ in zebrafish, and the JT5-loaded filter paper provided a solid-state platform for detecting Sn4+ by both naked eye and fluorescent methods. In summary, this work contributes to monitoring Sn4+ in organisms and solid-state materials and promotes understanding of Sn4+ functions in biological systems, environments, and solid-state materials.
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Affiliation(s)
- Yue-Hui Jia
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
| | - Yin-Xia Sun
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Lu-Lu Gao
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
| | - Yu Sun
- Experimental Teaching Department of Northwest Minzu University, Lanzhou 730030, China
| | - Zhe-Peng Deng
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Jin-Guo Li
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
| | - Biao Zhao
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
| | - Bo-Tao Ji
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
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Blessborn D, Kaewkhao N, Tarning J. A high-throughput LC-MS/MS assay for piperaquine from dried blood spots: Improving malaria treatment in resource-limited settings. J Mass Spectrom Adv Clin Lab 2024; 31:19-26. [PMID: 38229676 PMCID: PMC10789632 DOI: 10.1016/j.jmsacl.2023.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 12/04/2023] [Accepted: 12/21/2023] [Indexed: 01/18/2024] Open
Abstract
Background Malaria is a parasitic disease that affects many of the poorest economies, resulting in approximately 241 million clinical episodes and 627,000 deaths annually. Piperaquine, when administered with dihydroartemisinin, is an effective drug against the disease. Drug concentration measurements taken on day 7 after treatment initiation have been shown to be a good predictor of therapeutic success with piperaquine. A simple capillary blood collection technique, where blood is dried onto filter paper, is especially suitable for drug studies in remote areas or resource-limited settings or when taking samples from children, toddlers, and infants. Methods Three 3.2 mm discs were punched out from a dried blood spot (DBS) and then extracted in a 96-well plate using solid phase extraction on a fully automated liquid handling system. The analysis was performed using LC-MS/MS with a calibration range of 3 - 1000 ng/mL. Results The recovery rate was approximately 54-72 %, and the relative standard deviation was below 9 % for low, middle and high quality control levels. The LC-MS/MS quantification limit of 3 ng/mL is sensitive enough to detect piperaquine for up to 4-8 weeks after drug administration, which is crucial when evaluating recrudescence and drug resistance development. While different hematocrit levels can affect DBS drug measurements, the effect was minimal for piperaquine. Conclusion A sensitive LC-MS/MS method, in combination with fully automated extraction in a 96-well plate format, was developed and validated for the quantification of piperaquine in DBS. The assay was implemented in a bioanalytical laboratory for processing large-scale clinical trial samples.
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Affiliation(s)
- Daniel Blessborn
- Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | - Natpapat Kaewkhao
- Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Joel Tarning
- Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
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Nguemnang Kamdem C, Soubgwi Fogue P, Zebaze Tiofack AA, Mezajou Mewamba E, Tekeu Mengoue LE, Womeni MH, Simo G. Assessment of the capacity of Whatman filter papers as support to store stools for the molecular diagnostic testing of soil-transmitted helminthiasis. J Microbiol Methods 2023; 213:106824. [PMID: 37717625 DOI: 10.1016/j.mimet.2023.106824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 09/12/2023] [Accepted: 09/14/2023] [Indexed: 09/19/2023]
Abstract
Storage of stools for the detection of soil-transmitted helminths (STH) remains challenging for the molecular diagnostic testing of STH infections. This study aimed to overcome this challenge by assessing the capacity of Whatman filter papers to store stools for the molecular detection of STHs. Stool samples were collected from school-aged children of soil-transmitted helminthiasis endemic areas of Cameroon and then, analysed using Kato Katz technique. For this study, 128 and 40 stool samples respectively with and without STH eggs were analysed. From each sample, 10, 20, 40 and 80 mg of stool were weighted and spread on 6 grades of Whatman filter papers that were stored at room temperature from one to ten weeks. DNA was extracted from spread stool using CTAB based-method. The amount of stool to spread on filter papers and the grade of filter paper offering good storage were determined by amplifying specific DNA fragments of Ascaris lumbricoides. The capacity of filter papers to store stool samples for several weeks before the molecular detection of STH species was assessed by amplifying specific DNA fragments of different STHs. The amplification rates of A. lumbricoides were significantly higher (P < 0.0001) for 10 and 20 mg of stored stools. Stools spread on Whatman paper grade 2 yielded the highest amplification rate of 100% for A. lumbricoides, T. trichiura and hookworm. PCR revealed STH infections in all the 128 spread stools carrying STH eggs. It also revealed Necator americanus and Ancylostoma duodenale respectively in 10 and 13 of 15 spread stools contained hookworm eggs. PCR confirmed the co-infections of these hookworm species as well as that of A. lumbricoides and Trichuris trichiura in 7 spread stools. Out of 40 stools without STH eggs, PCR revealed that 5 (12.5%) and 9 (22.5%) had respectively A. lumbricoides and T. trichiura infections. The amplification rate of each STH species was 100% from one to 8 weeks and decreased to 86.7% after 10 weeks of storage. This study highlighted the capacity of filter papers to store stools for the molecular detection of STHs. Storing stools on these papers will enable to monitor and evaluate control programs and ensure post-elimination surveillance.
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Affiliation(s)
- Cyrille Nguemnang Kamdem
- Molecular Parasitology and Entomology Unit, Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Pythagore Soubgwi Fogue
- Molecular Parasitology and Entomology Unit, Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Auvaker Arnol Zebaze Tiofack
- Molecular Parasitology and Entomology Unit, Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Estelle Mezajou Mewamba
- Molecular Parasitology and Entomology Unit, Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Loic Edmond Tekeu Mengoue
- Molecular Parasitology and Entomology Unit, Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Macaire Hilaire Womeni
- Unité de Recherche de Biochimie, des plantes Médicinales, des Sciences alimentaires et Nutrition, University of Dschang, Dschang, Cameroon
| | - Gustave Simo
- Molecular Parasitology and Entomology Unit, Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon.
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Luo C, Liu J, Yang J, Xie X, Yu W, Chen H. Minimizing the variables of voiding spot assay for comparison between laboratories. PeerJ 2023; 11:e15420. [PMID: 37250709 PMCID: PMC10215753 DOI: 10.7717/peerj.15420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 04/25/2023] [Indexed: 05/31/2023] Open
Abstract
The voiding spot assay (VSA) is increasingly being adopted as a standard method for assessing mouse urinary function. However, VSA outcomes are highly sensitive to housing environment and procedural parameters. Many variables exist among laboratories, including analytical software, type of daily housing cage, transportation, and the time of the day. Some of these variables, such as the time of VSA and analytical software, have been shown to result in inconsistency and incomparability of data. In this study, we evaluated whether the results of VSA can be compared across laboratories by minimizing these variables. We found that analytical tools between Fiji and MATLAB are in good agreement in the quantification of VSA parameters, especially primary voiding spot (PVS) parameters. Unexpectedly, we found that mice housed in different daily home cages did not alter voiding patterns in a standard VSA cage. Nonetheless, we still recommend acclimation when performing VSA in unfamiliar cages. Notably, mice are highly sensitive to transportation and the time in the morning versus afternoon, which can induce significant changes in voiding patterns. Therefore, a standardized period among laboratories and allowing 2-3 days of rest for mice acclimation after transportation are necessary for VSA. Finally, we performed VSA using identical procedural parameters in two laboratories from two geographical locations to compare the results of VSA and concluded that it is possible to generate limited comparable VSA data, such as PVS volume.
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Affiliation(s)
- Chuang Luo
- The School of Basic Medical Sciences, Southwest Medical University, Luzhou, China
| | - Juan Liu
- The School of Basic Medical Sciences, Southwest Medical University, Luzhou, China
| | - Jiali Yang
- The School of Basic Medical Sciences, Southwest Medical University, Luzhou, China
| | - Xiang Xie
- The School of Basic Medical Sciences, Southwest Medical University, Luzhou, China
- Public Center of Experimental Technology, Model Animal and Human Disease Research of Luzhou Key Laboratory, Southwest Medical University, Luzhou, China
| | - Weiqun Yu
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
| | - Huan Chen
- The School of Basic Medical Sciences, Southwest Medical University, Luzhou, China
- Nucleic Acid Medicine of Luzhou Key Laboratory, Southwest Medical University, Luzhou, China
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Bailon N, Ramos E, Alvarado K, Bernaola L, Wilson J, Montoya R, Valencia T, Evans CA, Datta S. A controlled evaluation of filter paper use during staining of sputum smears for tuberculosis microscopy. Wellcome Open Res 2023; 8:171. [PMID: 37766850 PMCID: PMC10521092 DOI: 10.12688/wellcomeopenres.18827.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/07/2023] [Indexed: 09/29/2023] Open
Abstract
Background: Some sputum smear microscopy protocols recommend placing filter paper over sputum smears during staining for Mycobacterium tuberculosis (TB) . We found no published evidence assessing whether this is beneficial. We aimed to evaluate the effect of filter paper on sputum smear microscopy results. Methods: Sputum samples were collected from 30 patients with confirmed pulmonary TB and 4 healthy control participants. From each sputum sample, six smears (204 smears in total) were prepared for staining with Ziehl-Neelsen (ZN), auramine or viability staining with fluorescein diacetate (FDA). Half of the slides subjected to each staining protocol were randomly selected to have Whatman grade 3 filter paper placed over the dried smears prior to stain application and removed prior to stain washing. The counts of acid-fast bacilli (AFB) and precipitates per 100 high-power microscopy fields of view, and the proportion of smear that appeared to have been washed away were recorded. Statistical analysis used a linear regression model adjusted by staining technique with a random effects term to correct for between-sample variability. Results: The inclusion of filter paper in the staining protocol significantly decreased microscopy positivity independent of staining with ZN, auramine or FDA (p=0.01). Consistent with this finding, there were lower smear grades in slides stained using filter paper versus without (p=0.04), and filter paper use reduced AFB counts by 0.28 logarithms (95% confidence intervals, CI=0.018, 0.54, p=0.04) independent of staining technique. In all analyses, auramine was consistently more sensitive with higher AFB counts versus ZN (p=0.001), whereas FDA had lower sensitivity and lower AFB counts (p<0.0001). Filter paper use was not associated with the presence of any precipitate (p=0.5) or the probability of any smear washing away (p=0.6) during the staining process. Conclusions: Filter paper reduced the sensitivity of AFB microscopy and had no detectable beneficial effects so is not recommended.
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Affiliation(s)
- Nataly Bailon
- IFHAD: Innovation For Health And Development, Universidad Peruana Cayetano Heredia LID 416, Lima, Peru
- IPSYD: Innovacion Por la Salud Y el Desarollo, Asociación Benéfica Prisma, Lima, Peru
| | - Eric Ramos
- IFHAD: Innovation For Health And Development, Universidad Peruana Cayetano Heredia LID 416, Lima, Peru
- IPSYD: Innovacion Por la Salud Y el Desarollo, Asociación Benéfica Prisma, Lima, Peru
| | - Keren Alvarado
- IFHAD: Innovation For Health And Development, Universidad Peruana Cayetano Heredia LID 416, Lima, Peru
- IPSYD: Innovacion Por la Salud Y el Desarollo, Asociación Benéfica Prisma, Lima, Peru
| | - Lenin Bernaola
- IFHAD: Innovation For Health And Development, Universidad Peruana Cayetano Heredia LID 416, Lima, Peru
- IPSYD: Innovacion Por la Salud Y el Desarollo, Asociación Benéfica Prisma, Lima, Peru
| | - James Wilson
- IFHAD: Innovation For Health And Development, Universidad Peruana Cayetano Heredia LID 416, Lima, Peru
- IPSYD: Innovacion Por la Salud Y el Desarollo, Asociación Benéfica Prisma, Lima, Peru
| | - Rosario Montoya
- IFHAD: Innovation For Health And Development, Universidad Peruana Cayetano Heredia LID 416, Lima, Peru
- IPSYD: Innovacion Por la Salud Y el Desarollo, Asociación Benéfica Prisma, Lima, Peru
| | - Teresa Valencia
- IFHAD: Innovation For Health And Development, Universidad Peruana Cayetano Heredia LID 416, Lima, Peru
- IPSYD: Innovacion Por la Salud Y el Desarollo, Asociación Benéfica Prisma, Lima, Peru
| | - Carlton A Evans
- IFHAD: Innovation For Health And Development, Universidad Peruana Cayetano Heredia LID 416, Lima, Peru
- IPSYD: Innovacion Por la Salud Y el Desarollo, Asociación Benéfica Prisma, Lima, Peru
- IFHAD: Innovation For Health And Development, Department of Infectious Disease, Imperial College London, London, W12 0NN, UK
| | - Sumona Datta
- IFHAD: Innovation For Health And Development, Universidad Peruana Cayetano Heredia LID 416, Lima, Peru
- IPSYD: Innovacion Por la Salud Y el Desarollo, Asociación Benéfica Prisma, Lima, Peru
- Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, UK
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Hou M, Li N, Tian X, Yu Q, Hinestroza JP, Kong X. Preparation of SERS active filter paper for filtration and detection of pesticides residue from complex sample. Spectrochim Acta A Mol Biomol Spectrosc 2023; 285:121860. [PMID: 36137503 DOI: 10.1016/j.saa.2022.121860] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 08/24/2022] [Accepted: 09/04/2022] [Indexed: 06/16/2023]
Abstract
The selectivity is needed mostly in SERS sensing because analytes of interest are commonly present in a complex mixture containing particles and impurities, which hinder the interactions between the laser and analyte being detected. In this manuscript, we describe our efforts developing a simple and instant. method to prepare a filter paper SERS sensor. Colloidal Ag nanoparticles were immobilized on one side of filter paper via an in-situ growth method. The fabrication process of the sensor could be finished in several minutes, and no special facility needed. The filter paper SERS sensor demonstrated a spectra uniformity with a 7.0 % point-by-point signal deviation. And the filter function of the sensor could effectively filter out interferences from samples in 1 min, that allowing the direct detection of thiram in ketchup by SERS with detection limit of 93 ppb. Furthermore, we used a Quick Easy Cheap Effective Rugged and Safe (QuEChERS) sample preparation method to detect malachite green (MG) in soil with a sensitivity as low as 0.01 ppm without any sample pre-treatment or purification. A SERS filter paper may open a new avenue for rapid testing of food quality during manufacturing as well as fast detection of potential contaminants in a myriad of substrates.
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Affiliation(s)
- Min Hou
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, PR China
| | - Ning Li
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, PR China; Engineering Training Centre, Liaoning Petrochemical University, Fushun, Liaoning 113001, PR China
| | - Xiaoran Tian
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, PR China
| | - Qian Yu
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, PR China
| | - Juan-P Hinestroza
- Department of Fiber Science and Apparel Design, Cornell University, Ithaca, NY 14853, USA
| | - Xianming Kong
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, PR China.
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Jain B, Jain R, Jha RR, Ghosh A, Basu D, Abourehab MAS, Bajaj A, Chauhan V, Kaur S, Sharma S. Cellulose paper sorptive extraction (CPSE): A simple and affordable microextraction method for analysis of basic drugs in blood as a proof of concept. J Chromatogr B Analyt Technol Biomed Life Sci 2023; 1214:123551. [PMID: 36459855 DOI: 10.1016/j.jchromb.2022.123551] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 11/11/2022] [Accepted: 11/23/2022] [Indexed: 11/29/2022]
Abstract
Aiming towards simplifying sample preparation procedure, the present work explores use of unmodified laboratory filter paper as sorbent for extraction of nine basic drugs (five antidepressants, four benzodiazepines, and ketamine) from human blood samples and their analysis by gas chromatography-mass spectrometry (GC-MS). The procedure termed as cellulose paper sorptive extraction (CPSE) is straightforward. It involves adsorption of target analytes from deproteinized diluted blood samples on the unmodified cellulose paper followed by elution into 2 mL of methanol. Multivariate optimization, consisting of Placket-Burman design (PBD) and central composite design (CCD), was used to screen and optimize significant factors for CPSE. The proposed method follows the principles of green analytical chemistry (GAC), as the unmodified filter paper used as the sorbent is inexpensive and biodegradable. The technique is easy to perform and requires only 2 mL of MeOH during the entire extraction procedure. Under the optimized conditions, the limit of detection and quantification for the target analytes were estimated to be in the range of 0.003-0.035 and 0.010-0.117 µg mL-1, respectively. In contrast, the relative standard deviations were consistently below 10 %. The calibration curves were linear in the range of 0.015-2 µg mL-1 with a coefficient of determination (R2) in the range of 0.995-0.999.Satisfactory recoveries ranging from 87 to 99 % was achieved. As proof of concept, the analysis of nine drugs in blood samples from the patients was performed to demonstrate the potential application of the proposed method.
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9
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Cosgrove DJ, Hepler NK, Wagner ER, Durachko DM. Biomechanical Weakening of Paper and Plant Cell Walls by Bacterial Expansins. Methods Mol Biol 2023; 2657:79-88. [PMID: 37149523 DOI: 10.1007/978-1-0716-3151-5_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Expansins are proteins that loosen plant cell walls but lack enzymatic activity. Here we describe two protocols tailored to measure the biomechanical activity of bacterial expansin. The first assay relies on the weakening of filter paper by expansin. The second assay is based on induction of creep (long-term, irreversible extension) of plant cell wall samples.
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Affiliation(s)
- Daniel J Cosgrove
- Department of Biology, Pennsylvania State University, University Park, PA, USA.
| | - Nathan K Hepler
- Department of Biology, Pennsylvania State University, University Park, PA, USA
| | - Edward R Wagner
- Department of Biology, Pennsylvania State University, University Park, PA, USA
| | - Daniel M Durachko
- Department of Biology, Pennsylvania State University, University Park, PA, USA
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10
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Li S, Li B, Li X, Liu C, Qi X, Gu Y, Lin B, Sun L, Chen L, Han B, Guo J, Huang Y, Wu S, Ren L, Wang J, Bai J, Ma J, Yao M, Liu P. An ultrasensitive and rapid "sample-to-answer" microsystem for on-site monitoring of SARS-CoV-2 in aerosols using "in situ" tetra-primer recombinase polymerase amplification. Biosens Bioelectron 2023; 219:114816. [PMID: 36327559 PMCID: PMC9610180 DOI: 10.1016/j.bios.2022.114816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 09/22/2022] [Accepted: 10/12/2022] [Indexed: 11/09/2022]
Abstract
Airborne transmissibility of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has highlighted the urgent need for aerosol monitoring of SARS-CoV-2 to prevent sporadic outbreaks of COVID-19. The inadequate sensitivity of conventional methods and the lack of an on-site detection system limited the practical SARS-CoV-2 monitoring of aerosols in public spaces. We have developed a novel SARS-CoV-2-in-aerosol monitoring system (SIAMs) which consists of multiple portable cyclone samplers for collecting aerosols from several venues and a sensitive "sample-to-answer" microsystem employing an integrated cartridge for the analysis of SARS-CoV-2 in aerosols (iCASA) near the sampling site. By seamlessly combining viral RNA extraction based on a chitosan-modified quartz filter and "in situ" tetra-primer recombinase polymerase amplification (tpRPA) into an integrated microfluidic cartridge, iCASA can provide an ultra-high sensitivity of 20 copies/mL, which is nearly one order of magnitude greater than that of the commercial kit, and a short turnaround time of 25 min. By testing various clinical samples of nasopharyngeal swabs, saliva, and exhaled breath condensates obtained from 23 COVID-19 patients, we demonstrate that the positive rate of our system was 3.3 times higher than those of the conventional method. Combining with multiple portable cyclone samplers, we detected 52.2% (12/23) of the aerosol samples, six times higher than that of the commercial kit, collected from the isolation wards of COVID-19 patients, demonstrating the excellent performance of our system for SARS-CoV-2-in-aerosol monitoring. We envision the broad application of our microsystem in aerosol monitoring for fighting the COVID-19 pandemic.
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Affiliation(s)
- Shanglin Li
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Bao Li
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Xinyue Li
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
| | - Ce Liu
- School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, China
| | - Xiao Qi
- Center for Disease Control and Prevention of Chaoyang District of Beijing, Beijing, 100021, China
| | - Yin Gu
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, 100094, China
| | - Baobao Lin
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Lingli Sun
- Center for Disease Control and Prevention of Chaoyang District of Beijing, Beijing, 100021, China
| | - Lan Chen
- NHC Key Laboratory of Systems Biology of Pathogens and Christophe Mérieux Laboratory, Institute of Pathogen Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China; Key Laboratory of Respiratory Disease Pathogenomics, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Bingqian Han
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Jiazhen Guo
- Beijing Ditan Hospital, Capital Medical University, Beijing, 100015, China
| | - Yanyi Huang
- Biomedical Pioneering Innovation Center (BIOPIC), School of Life Sciences, Peking University, Beijing, 100871, China
| | - Shuangsheng Wu
- Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Diseases Prevention and Control, Beijing, 100013, China
| | - Lili Ren
- NHC Key Laboratory of Systems Biology of Pathogens and Christophe Mérieux Laboratory, Institute of Pathogen Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China; Key Laboratory of Respiratory Disease Pathogenomics, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Jianbin Wang
- School of Life Sciences, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Jingwei Bai
- School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, China.
| | - Jianxin Ma
- Center for Disease Control and Prevention of Chaoyang District of Beijing, Beijing, 100021, China.
| | - Maosheng Yao
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China.
| | - Peng Liu
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China.
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11
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Baird S, Clinton Frazee C, Garg U. Quantitation of Phenylalanine in Dried Blood Spot Using Liquid Chromatography Tandem Mass Spectrometry for Monitoring of Patients with Phenylketonuria (PKU). Methods Mol Biol 2022; 2546:391-399. [PMID: 36127606 DOI: 10.1007/978-1-0716-2565-1_34] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Newborn screening for phenylketonuria (PKU) is performed by analysis of phenylalanine in dried blood spot (DBS). Once diagnosed by a definitive method, a patient's dietary control is performed by repeated analysis of phenylalanine in venous blood or DBS. Since venipuncture is time consuming, painful, and may often be difficult to achieve in newborns, the use of DBS for analysis of phenylalanine is becoming a preferred method for dietary monitoring of patients with PKU. Using a lancet, patients or their guardians collect finger capillary blood on an approved filter paper. Once collected, the filter paper with DBS is sent to the laboratory for phenylalanine analysis. In the laboratory, phenylalanine is extracted from the DBS using organic solvents. Here, we describe an LC-MS/MS method for the analysis of phenylalanine from DBS with an approximation to serum levels.
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Affiliation(s)
- Serena Baird
- Department of Pathology and Laboratory Medicine, Children's Mercy Hospital, Kansas City, MO, USA
| | - C Clinton Frazee
- Department of Pathology and Laboratory Medicine, Children's Mercy Hospital, Kansas City, MO, USA
| | - Uttam Garg
- Department of Pathology and Laboratory Medicine, Children's Mercy Hospital, Kansas City, MO, USA.
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12
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Ball EH, Basilone NT. Filter paper disks as a matrix for manipulation of recombinant proteins. Anal Biochem 2022; 655:114841. [PMID: 35961400 DOI: 10.1016/j.ab.2022.114841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/19/2022] [Accepted: 07/29/2022] [Indexed: 11/16/2022]
Abstract
Filter paper provides an excellent matrix for retention of proteins containing a cellulose binding domain. To use this capability for manipulating recombinant fusion proteins, binding and elution parameters were explored and procedures developed for small scale purification, modification and assay. Proteins were tagged with the cellulose binding domain from the Clostridium thermocellum CipB gene via a cleavable linker. Filter paper disks of 6 mm diameter were able to bind up to 80 μg protein although there was a substantial dependence on molecular size. Different means of introducing fusion proteins to the disks allow either binding within 20 min from microliter volumes or slower binding from milliliter volumes. Elution with protease in small volumes yielded greater than 10 μg amounts with concentrations in the 1-2 mg/ml range. To demonstrate their utility, disks were used for small scale protein purification, covalent modification of protein, immunoprecipitation, and in a binding assay. These versatile methods allow parallel processing of multiple samples and may find many uses when only small amounts of protein are needed.
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Affiliation(s)
- Eric H Ball
- Department of Biochemistry, University of Western Ontario London, Ontario, N6G 3C3, Canada.
| | - Nicoletta T Basilone
- Department of Biochemistry, University of Western Ontario London, Ontario, N6G 3C3, Canada
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13
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Chia RW, Lee JY, Cha J. Comment on the paper 'Soil microplastic pollution under different land uses in tropics, southwestern China'. Chemosphere 2022; 298:134289. [PMID: 35283144 DOI: 10.1016/j.chemosphere.2022.134289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/03/2022] [Accepted: 03/07/2022] [Indexed: 06/14/2023]
Abstract
Research on soil microplastics is currently at an early stage, and there is no widely approved sampling protocol. Even so, any basic research should minimize errors to ensure that they are not amplified in future research. This paper examines some weaknesses of the original research paper 'Soil microplastic pollution under different land uses in tropics, southwestern China' recently published in this journal. The authors neglected to report the equipment used for soil sampling and did not use field blank samples. There is also a soil layer that was incorrectly named. The type and pore size of filter paper used for filtration during pre-analytical soil sample preparation is very important. In this paper the nature of the filter paper used, and its larger pore sizes are questionable by today's scientists. In addition, the authors in the original paper also overlooked reporting the statistical package used for statical analysis and ensuring if all data sets obey normality, homogeneity, and equality before running the one-way ANOVA test. This statistical step is widely considered mandatory, especially in the soil science community. So, this makes it difficult to trust the results documented. Furthermore, in the original paper, the needle and stereo microscope instruments used to sort microplastic-like materials prior to proper analysis are not reliable.
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Affiliation(s)
- Rogers Wainkwa Chia
- Department of Geology, Kangwon National University, Chuncheon, 24341, Republic of Korea; Research Institute for Earth Resources, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Jin-Yong Lee
- Department of Geology, Kangwon National University, Chuncheon, 24341, Republic of Korea; Research on Microplastics in Groundwater (RMPG), Kangwon National University, Chuncheon, 24341, Republic of Korea.
| | - Jihye Cha
- Department of Geology, Kangwon National University, Chuncheon, 24341, Republic of Korea; Research on Microplastics in Groundwater (RMPG), Kangwon National University, Chuncheon, 24341, Republic of Korea
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14
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Liu H, Zhang Y, Huang L, Wang M. A colorimetric gas-sensitive array sensor using filter paper for the analysis of fish freshness. Food Chem 2022; 377:132029. [PMID: 35032853 DOI: 10.1016/j.foodchem.2021.132029] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 12/29/2021] [Accepted: 12/31/2021] [Indexed: 11/19/2022]
Abstract
We developed a colorimetric array sensor using filter paper (FPCAS) to detect fish freshness. After 16 common indicators sensitive to trimethylamine, aldehydes, and sulfides were screened, they were further sensitized and dotted on filter paper to prepare FPCAS. The results revealed that FPCAS was beneficial in the later detection of fish storage. When we used FPCAS to detect the freshness of bass stored at 30 °C, total discriminant accuracy was 100%, and cross-validation accuracy was 63.5%. When detecting the freshness of bass stored at 4 °C, the total discriminant accuracy reached 100%, and cross validation accuracy was 93.3%. Therefore, FPCAS can distinguish fish freshness under commercial cold storage conditions. In addition, the indicators and filter paper used for FPCAS are low-cost. Consequently, FPCAS is a good freshness indicator of meat and fish.
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Affiliation(s)
- Haiying Liu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi Jiangsu, People's Republic of China; School of Food Science and Technology, Jiangnan University, Wuxi Jiangsu, People's Republic of China.
| | - Yiran Zhang
- School of Food Science and Technology, Jiangnan University, Wuxi Jiangsu, People's Republic of China
| | - Lu Huang
- School of Food Science and Technology, Jiangnan University, Wuxi Jiangsu, People's Republic of China
| | - Mengyao Wang
- School of Food Science and Technology, Jiangnan University, Wuxi Jiangsu, People's Republic of China
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15
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Wang Q, Sun N, Kunzke T, Buck A, Shen J, Prade VM, Stöckl B, Wang J, Feuchtinger A, Walch A. A simple preparation step to remove excess liquid lipids in white adipose tissue enabling improved detection of metabolites via MALDI-FTICR imaging MS. Histochem Cell Biol 2022; 157:595-605. [PMID: 35391562 PMCID: PMC9114030 DOI: 10.1007/s00418-022-02088-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/09/2022] [Indexed: 11/10/2022]
Abstract
Matrix-assisted laser desorption ionization (MALDI) Fourier transform ion cyclotron resonance (FTICR) imaging mass spectrometry (MS) is a powerful technology used to analyze metabolites in various tissues. However, it faces significant challenges in studying adipose tissues. Poor matrix distribution and crystallization caused by excess liquid lipids on the surface of tissue sections hamper m/z species detection, an adverse effect that particularly presents in lipid-rich white adipose tissue (WAT). In this study, we integrated a simple and low-cost preparation step into the existing MALDI-FTICR imaging MS pipeline. The new method—referred to as filter paper application—is characterized by an easy sample handling and high reproducibility. The aforementioned filter paper is placed onto the tissue prior to matrix application in order to remove the layer of excess liquid lipids. Consequently, MALDI-FTICR imaging MS detection was significantly improved, resulting in a higher number of detected m/z species and higher ion intensities. After analyzing various durations of filter paper application, 30 s was found to be optimal, resulting in the detection of more than 3700 m/z species. Apart from the most common lipids found in WAT, other molecules involved in various metabolic pathways were detected, including nucleotides, carbohydrates, and amino acids. Our study is the first to propose a solution to a specific limitation of MALDI-FTICR imaging MS in investigating lipid-rich WAT. The filter paper approach can be performed quickly and is particularly effective for achieving uniform matrix distribution on fresh frozen WAT while maintaining tissue integrity. It thus helps to gain insight into the metabolism in WAT.
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Affiliation(s)
- Qian Wang
- Research Unit Analytical Pathology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764, Neuherberg, Germany
| | - Na Sun
- Research Unit Analytical Pathology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764, Neuherberg, Germany
| | - Thomas Kunzke
- Research Unit Analytical Pathology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764, Neuherberg, Germany
| | - Achim Buck
- Research Unit Analytical Pathology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764, Neuherberg, Germany
| | - Jian Shen
- Research Unit Analytical Pathology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764, Neuherberg, Germany
| | - Verena M Prade
- Research Unit Analytical Pathology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764, Neuherberg, Germany
| | - Barbara Stöckl
- Research Unit Analytical Pathology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764, Neuherberg, Germany
| | - Jun Wang
- Research Unit Analytical Pathology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764, Neuherberg, Germany
| | - Annette Feuchtinger
- Research Unit Analytical Pathology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764, Neuherberg, Germany
| | - Axel Walch
- Research Unit Analytical Pathology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764, Neuherberg, Germany.
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16
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Hansson H, Saidi Q, Alifrangis M. Preservation and Extraction of Malaria Parasite DNA from Dried Blood Spots. Methods Mol Biol 2022; 2470:27-36. [PMID: 35881336 DOI: 10.1007/978-1-0716-2189-9_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Molecular studies related to diagnosis and research rely on collection of blood samples and extraction of high-quality DNA. In Africa, where the populations carried 94% of the total burden of cases and deaths due to malaria in 2019, collection of samples is often challenged by remote study areas and lack of a cold chain to transport and store samples. Collection of blood on filter paper is a technique that is less invasive and has simpler requirements regarding training of staff, storage, and transport of samples than collection of venous blood samples. Dried blood spots (DBS) are therefore commonly used in many research projects. However, DNA quality can be affected by duration and conditions of storage. The quality of the DNA for molecular analyses also depends on a DNA extraction methodology that provides high-quality DNA with high purity and yield. Several protocols for DNA extraction have been described, and many comparative studies have analyzed and optimized the different methodologies to find an alternative to the more costly commercial extraction kits. This chapter describes recommendations for storage and preservation of DBS, and a Chelex-based protocol for extraction of DNA from DBS.
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Affiliation(s)
- Helle Hansson
- Centre for Medical Parasitology, Department of Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark.
- Department of Infectious Diseases, Copenhagen University Hospital, Copenhagen N, Denmark.
| | - Queen Saidi
- Centre for Medical Parasitology, Department of Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark
- Department of Infectious Diseases, Copenhagen University Hospital, Copenhagen N, Denmark
- Kilimanjaro Clinical Research Institute, Moshi, Tanzania
| | - Michael Alifrangis
- Centre for Medical Parasitology, Department of Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark
- Department of Infectious Diseases, Copenhagen University Hospital, Copenhagen N, Denmark
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17
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Cao M, Liu X, Wang W, Gao M, Yang H. Bifunctional two-dimensional copper-aluminum modified filter paper composite for efficient tetracycline removal: Synergy of adsorption and reusability by degradation. Chemosphere 2022; 287:132031. [PMID: 34492408 DOI: 10.1016/j.chemosphere.2021.132031] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 08/09/2021] [Accepted: 08/24/2021] [Indexed: 05/05/2023]
Abstract
Herein, bifunctional two-dimensional copper-aluminum modified filter paper composite (2D-Cu/Al-C) was successfully prepared by simple calcination and showed ultrahigh adsorption performance and degradation potential. The adsorption removal of TC on 2D-Cu/Al-C all exceeded 92.2% under solution conditions of 10-200 mg/L TC, 100 mg/L 2D-Cu/Al-C, pH 8 and 298 K. The pseudo-second-order kinetic and Langmuir models better fitted the kinetic and isotherm data via spontaneous and exothermic process, and the maximum capacity of the 2D-Cu/Al-C was 2391.78 mg/g. Additionally, 2D-Cu/Al-C showed desired specific adsorption for TC (TC: 98.7%, norfloxacin: 5.8%, sulfamethoxazole: 2.1%, and ciprofloxacin: 1.8%) and it could effectively adsorbed TC even in the binary system (various coexisting ions or natural organic matter). After TC adsorbed on adsorbent was mineralized into CO2 and H2O by adding peroxydisulfate to generate high electrode potential radical in another limited systems, the 2D-Cu/Al-C still had ∼89.12% on TC removal (initial concentration of 50 mg/L) after five experimental cycles. Zeta potential, FT-IR and XPS results indicated that the multi-adsorption mechanism, including electrostatic interactions, complexation, and H-bonds, played a vital role in the fast and efficient adsorption process. Thus, the way of combining adsorption and regeneration via degradation are green, non-polluting strategy which are expected to be applied for water purification in future environmental remediation.
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Affiliation(s)
- Mengbo Cao
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi, China
| | - Xun Liu
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi, China
| | - Wei Wang
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi, China
| | - Ming Gao
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi, China
| | - Hongbing Yang
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi, China.
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18
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Valoppi F, Lassila P, Salmi A, Haeggström E. Automated image analysis method for oil-release test of lipid-based materials. MethodsX 2021; 8:101447. [PMID: 34434858 PMCID: PMC8374682 DOI: 10.1016/j.mex.2021.101447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 07/08/2021] [Indexed: 11/12/2022] Open
Abstract
We present an automated method to determine oil release from lipid-based materials. Oil-release tests can provide information regarding the ability to retain oil within the structuring network of lipid-based materials. This test provides a first insight into the stability of these materials and their possible applications in food, cosmetic, and pharmaceutical products. The method presented features a simple setup comprising a camera that automatically captures images of the evolution of the oil stain released from lipid-based materials placed on a filter paper. Image postprocessing is performed with two custom-made scripts developed for the freeware application ImageJ. The scripts allow direct calculation of the oil-stain area from all images stored in a folder returning as output numerical values in a table. This method was shown to be:inexpensive, as the employed tools and equipment are available in most laboratories both in academia and industry, self-running, as the method automatically captures images at predefined time intervals for a certain time span, practical, as manual-image analysis is unnecessary (200 images can be automatically analyzed in 3 min).
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Affiliation(s)
- Fabio Valoppi
- Electronics Research Laboratory, Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2, PO Box 64, Helsinki 00014, Finland.,Department of Food and Nutrition, University of Helsinki, Agnes Sjöbergin katu 2, PO Box 66, Helsinki 00014, Finland.,Faculty of Agriculture and Forestry, Helsinki Institute of Sustainability Science, University of Helsinki, Helsinki 00014, Finland
| | - Petri Lassila
- Electronics Research Laboratory, Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2, PO Box 64, Helsinki 00014, Finland
| | - Ari Salmi
- Electronics Research Laboratory, Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2, PO Box 64, Helsinki 00014, Finland
| | - Edward Haeggström
- Electronics Research Laboratory, Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2, PO Box 64, Helsinki 00014, Finland
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19
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Beyerl J, Rubio-Acero R, Castelletti N, Paunovic I, Kroidl I, Khan ZN, Bakuli A, Tautz A, Oft J, Hoelscher M, Wieser A. A dried blood spot protocol for high throughput analysis of SARS-CoV-2 serology based on the Roche Elecsys anti-N assay. EBioMedicine 2021; 70:103502. [PMID: 34333234 PMCID: PMC8320407 DOI: 10.1016/j.ebiom.2021.103502] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 07/12/2021] [Accepted: 07/12/2021] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Since 2020 SARS-CoV-2 spreads pandemically, infecting more than 119 million people, causing >2·6 million fatalities. Symptoms of SARS-CoV-2 infection vary greatly, ranging from asymptomatic to fatal. Different populations react differently to the disease, making it very hard to track the spread of the infection in a population. Measuring specific anti-SARS-CoV-2 antibodies is an important tool to assess the spread of the infection or successful vaccinations. To achieve sufficient sample numbers, alternatives to venous blood sampling are needed not requiring medical personnel or cold-chains. Dried-blood-spots (DBS) on filter-cards have been used for different studies, but not routinely for serology. METHODS We developed a semi-automated protocol using self-sampled DBS for SARS-CoV-2 serology. It was validated in a cohort of matched DBS and venous-blood samples (n = 1710). Feasibility is demonstrated with two large serosurveys with 10247 company employees and a population cohort of 4465 participants. FINDINGS Sensitivity and specificity reached 99·20% and 98·65%, respectively. Providing written instructions and video tutorials, 99·87% (4465/4471) of the unsupervised home sampling DBS cards could be analysed. INTERPRETATION DBS-sampling is a valid and highly reliable tool for large scale serosurveys. We demonstrate feasibility and accuracy with a large validation cohort including unsupervised home sampling. This protocol might be of big importance for surveillance in resource-limited settings, providing low-cost highly accurate serology data. FUNDING Provided by Bavarian State Ministry of Science and the Arts, LMU University-Hospital; Helmholtz-Centre-Munich, German Ministry for Education and Research (project01KI20271); University of Bonn; University of Bielefeld; the Medical Biodefense Research Program of Bundeswehr-Medical-Service; Euroimmun, RocheDiagnostics provided discounted kits and machines.
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Affiliation(s)
- Jessica Beyerl
- Division of Infectious Diseases and Tropical Medicine, University Hospital, Ludwig-Maximilians-Universität (LMU) Munich, Munich 80802, Germany
| | - Raquel Rubio-Acero
- Division of Infectious Diseases and Tropical Medicine, University Hospital, Ludwig-Maximilians-Universität (LMU) Munich, Munich 80802, Germany
| | - Noemi Castelletti
- Division of Infectious Diseases and Tropical Medicine, University Hospital, Ludwig-Maximilians-Universität (LMU) Munich, Munich 80802, Germany
| | - Ivana Paunovic
- Division of Infectious Diseases and Tropical Medicine, University Hospital, Ludwig-Maximilians-Universität (LMU) Munich, Munich 80802, Germany
| | - Inge Kroidl
- Division of Infectious Diseases and Tropical Medicine, University Hospital, Ludwig-Maximilians-Universität (LMU) Munich, Munich 80802, Germany
| | - Zohaib N Khan
- Division of Infectious Diseases and Tropical Medicine, University Hospital, Ludwig-Maximilians-Universität (LMU) Munich, Munich 80802, Germany
| | - Abhishek Bakuli
- Division of Infectious Diseases and Tropical Medicine, University Hospital, Ludwig-Maximilians-Universität (LMU) Munich, Munich 80802, Germany
| | - Andreas Tautz
- Corporate Health Management / Department Occupational Health; DPDHL Group, Bonn 53113, Germany
| | - Judith Oft
- Center for International Health (CIH), University Hospital, LMU Munich, Munich 80336, Germany
| | - Michael Hoelscher
- Division of Infectious Diseases and Tropical Medicine, University Hospital, Ludwig-Maximilians-Universität (LMU) Munich, Munich 80802, Germany; German Center for Infection Research (DZIF), Partner Site Munich, Germany; Center for International Health (CIH), University Hospital, LMU Munich, Munich 80336, Germany
| | - Andreas Wieser
- Division of Infectious Diseases and Tropical Medicine, University Hospital, Ludwig-Maximilians-Universität (LMU) Munich, Munich 80802, Germany; German Center for Infection Research (DZIF), Partner Site Munich, Germany.
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20
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Carneiro MS, Crispim MN, Wink PL, Barth AL. Evaluation of filter paper to transport inactivated bacteria to detect carbapenem resistance genes by multiplex real-time PCR using high-resolution melting. Braz J Microbiol 2021; 52:1353-6. [PMID: 34213734 DOI: 10.1007/s42770-021-00530-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 05/12/2021] [Indexed: 12/31/2022] Open
Abstract
Infections caused by resistant microorganisms are a complex global public health challenge, and the way to combat the increase of resistance is the development of more modern and faster techniques for resistance detection. This study aimed to evaluate the transport of inactivated bacteria impregnated in a filter paper disk to detect carbapenem resistance genes by multiplex real-time PCR (qPCR) using high-resolution melting (HRM). A total of 88 isolates of 10 different species of Enterobacterales harboring well-characterized carbapenem resistance genes were evaluated. A full 10-µL loop of fresh growth of bacteria were impregnated in a filter paper disk, which was left at room temperature for 2 days in order to simulate the time spent in transportation. Bacterial inactivation was performed with 70% ethanol at 15 min. Afterwards, the DNA was extracted from the paper disks for further analysis by qPCR HRM. The time of 15 min in 70% ethanol was enough to inactivate all the isolates tested. It was possible to correctly identify the presence of the carbapenem resistance gene by HRM qPCR in 87 isolates (98.87%) that were transported in the filter paper disks. Our results indicated that it is possible to use filter paper to transport inactivated bacteria and to identify carbapenem resistance genes by qPCR HRM. This alternative tends to facilitate the access to this technology by many laboratories which do not have the qPCR equipment.
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21
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Díaz-Liñán MC, Lucena R, Cárdenas S, López-Lorente AI. Unmodified cellulose filter paper, a sustainable and affordable sorbent for the isolation of biogenic amines from beer samples. J Chromatogr A 2021; 1651:462297. [PMID: 34111676 DOI: 10.1016/j.chroma.2021.462297] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 05/18/2021] [Accepted: 05/25/2021] [Indexed: 02/06/2023]
Abstract
While current trends in Green Analytical Chemistry aim at reducing or simplifying sample treatment, food usually comprises complex matrices where direct analysis is not possible in most cases. In this context, sample treatment plays a pivotal role. Biogenic amines are naturally formed in many foodstuffs due to the action of microorganisms, while their presence has been associated with adverse health effects. In this work, the extraction of seven biogenic amines (cadaverine, histamine, phenylethylamine, putrescine, spermidine, spermine, and tyramine) from beer samples has been simplified using laboratory filter paper as sorbent without any further modification. The analysis of the eluates by direct infusion mass spectrometry reduces the time of analysis, increasing the sample throughput. This simple but effective method enabled the determination of the analytes with limits of detection as low as 0.06 mg L-1 and relative standard deviations better than 11.9%. The suitability of the method has been assessed by analyzing eight different types of beers by the standard addition method.
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22
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Pedrão PG, de Carvalho AC, Possati-Resende JC, de Paula Cury F, Campanella NC, de Oliveira CM, Tavares Guerreiro Fregnani JH. DNA Recovery Using Ethanol-Based Liquid Medium from FTA Card-Stored Samples for HPV Detection. Acta Cytol 2021; 65:264-271. [PMID: 33951624 DOI: 10.1159/000515913] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 03/09/2021] [Indexed: 01/22/2023]
Abstract
INTRODUCTION Alternative methods of dry storage and transportation may be a viable alternative to the use of liquid storage medium for cervical samples, especially for screening programs in places with few resources. OBJECTIVE The objective of this study is to verify the viability and efficacy of human papillomavirus DNA (HPV-DNA) detection in cervical cell samples collected and stored on a Flinders Technology Associates (FTA) card (Whatman Indicating FTA® Elute Micro Card) and subsequently recovered in ethanol-based liquid medium and to compare the results to those obtained using samples stored directly in ethanol-based liquid medium. STUDY DESIGN Thirty-four women submitted to ETZ (excision of the transformation zone of the cervix) were included in this study. Before ETZ, 2 samples of exfoliated cervical cells were collected from each woman by a doctor and stored in ethanol-based liquid medium and on an FTA card. DNA recovery from FTA samples was performed using ethanol-based liquid medium. Detection of HPV-DNA in the samples was performed using the Cobas® 4800 HPV Test Platform. RESULTS AND CONCLUSIONS The HPV-DNA detection positivity rates were 70.6% for the samples collected directly in liquid medium and 64.7% for the samples stored on the FTA card, with high detection accuracy in the DNA samples recovered from the FTA card (area under the curve = 0.958; 95% confidence interval = 0.890-1.000). The concordance between the results obtained using the 2 storage media was 94.1% (Kappa = 0.866). These preliminary results suggest that collection of cervical material on an FTA card may be an alternative to storage in liquid medium since the liquid medium has some limitations. In addition, DNA recovery from the card using ethanol-based liquid medium streamlines the workflow in the laboratory and reduces the cost associated with reagents, thereby facilitating access to the HPV test in places with few resources and potentially improving cervical cancer screening.
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Affiliation(s)
- Priscila Grecca Pedrão
- Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, São Paulo, Brazil
| | | | | | | | - Nathália C Campanella
- Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, São Paulo, Brazil
| | - Cristina Mendes de Oliveira
- Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, São Paulo, Brazil
- DASA Laboratories, São Paulo, Brazil
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Mouri K, Shimizu K. Stability of chimpanzee (Pan troglodytes) urinary reproductive hormones during long-term preservation on filter paper. Primates 2021; 62:289-96. [PMID: 32955646 DOI: 10.1007/s10329-020-00864-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Accepted: 09/07/2020] [Indexed: 10/23/2022]
Abstract
Urine contains multiple water-soluble hormones, which are valuable non-invasive biomarkers for the monitoring of reproductive status and health. An effective method for drying urine on filter paper was previously developed to preserve wildlife urine samples where electrical equipment was not available for this; however, the stability of samples preserved in this way remains to be verified. Here, we developed and validated a method to elute multiple water-soluble reproductive hormones from filter paper that had been stored for an extended period of time. Aliquots of urine from chimpanzees were adsorbed on filter papers, air dried and stored for 1 year at room temperature. Estrone-3-conjugate (E1C), pregnanediol-3-glucuronide (PdG), estriol-3-glucuronide (E3G), and chorionic gonadotropin (CG) were eluted into deionized water from the filter papers and measured using enzyme immunoassays (EIAs). The mean recoveries of E1C, PdG, and creatinine from filter papers stored for 1 year were 69.5%, 128.7%, and 83.8%, respectively. The profiles of E1C and PdG from preserved filter papers significantly correlated with those derived from a direct analysis of the frozen urine of menstruating chimpanzees. We detected E3G and CG from 1-year-old filter papers for urine collected during early pregnancy, but the recovery of E3G was low and CG profiles did not correlate with those of the original frozen urine samples. The method proposed here for the elution and measurement of reproductive hormones in urine preserved for a long period of time on filter paper provides a practical and simple way to monitor the reproductive status of chimpanzees. We propose that this method can also be utilized in field studies of other wild nonhuman primates.
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Karadas O, Mese G, Ozcivici E. Low magnitude high frequency vibrations expedite the osteogenesis of bone marrow stem cells on paper based 3D scaffolds. Biomed Eng Lett 2020; 10:431-441. [PMID: 32850178 PMCID: PMC7438393 DOI: 10.1007/s13534-020-00161-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 06/12/2020] [Accepted: 06/27/2020] [Indexed: 01/08/2023] Open
Abstract
Anabolic effects of low magnitude high frequency (LMHF) vibrations on bone tissue were consistently shown in the literature in vivo, however in vitro efforts to elucidate underlying mechanisms are generally limited to 2D cell culture studies. Three dimensional cell culture platforms better mimic the natural microenvironment and biological processes usually differ in 3D compared to 2D culture. In this study, we used laboratory grade filter paper as a scaffold material for studying the effects of LHMF vibrations on osteogenesis of bone marrow mesenchymal stem cells in a 3D system. LMHF vibrations were applied 15 min/day at 0.1 g acceleration and 90 Hz frequency for 21 days to residing cells under quiescent and osteogenic conditions. mRNA expression analysis was performed for alkaline phosphatase (ALP) and osteocalcin (OCN) genes, Alizarin red S staining was performed for mineral nodule formation and infrared spectroscopy was performed for determination of extracellular matrix composition. The highest osteocalcin expression, mineral nodule formation and the phosphate bands arising from the inorganic phase was observed for the cells incubated in osteogenic induction medium with vibration. Our results showed that filter paper can be used as a model scaffold system for studying the effects of mechanical loads on cells, and LMHF vibrations induced the osteogenic differentiation of stem cells.
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Affiliation(s)
- Ozge Karadas
- Department of Bioengineering, Rm A210, Izmir Institute of Technology, Urla, Izmir, 35430 Turkey
| | - Gulistan Mese
- Department of Molecular Biology and Genetics, Izmir Institute of Technology, Urla, Izmir, Turkey
| | - Engin Ozcivici
- Department of Bioengineering, Rm A210, Izmir Institute of Technology, Urla, Izmir, 35430 Turkey
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Zhang F, Pei X, Zhai K, Wang C, Bai Y, Zhang B, Wang Y, Tan Y, Xu K, Wang P. Starch-based nanospheres modified filter paper for o/w emulsions separation and contaminants removal. Int J Biol Macromol 2020; 162:1118-1126. [PMID: 32599252 DOI: 10.1016/j.ijbiomac.2020.06.233] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 06/10/2020] [Accepted: 06/24/2020] [Indexed: 12/27/2022]
Abstract
There is a pressing need around the world to develop novel functional biodegradable materials to separate oil/water mixtures and emulsions completely. Recently, superhydrophilicity and underwater superoleophobicity materials have been attracted attention due to their high efficiency in oil/water separation. However, it is still a challenge to prepare materials that combine oil/water separation and water purification in an environment-friendly way. In this work, biodegradable starch-based nanospheres (SNPs) coated filter paper was prepared in a low-cost, simple, and environmentally friendly manner. The SNPs coating could not only help to change the wettability of the substrate material but also build the hierarchical micro and nano structures which are conducive to separation and purification process. After modification by coating SNPs, the filter paper exhibited excellent performance in a wide range of oil/water mixtures or emulsions separation and the wettability of the filter paper could be regulated by adjusting the pH value. The modified filter paper presented good recyclability after several separation process. Furthermore, the as-prepared filter paper could also remove water-soluble contaminants during the oil/water separation process, thus realizing to combine separation and purification process in one single step. This biodegradable starch-based separating material with good separation performance, stability and recyclability has significant application potential in practical separation and purification process.
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Affiliation(s)
- Fan Zhang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; University of Science and Technology of China, Hefei 230026, PR China
| | - Xiaopeng Pei
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; University of Science and Technology of China, Hefei 230026, PR China
| | - Kankan Zhai
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; University of Science and Technology of China, Hefei 230026, PR China
| | - Chao Wang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; University of Science and Technology of China, Hefei 230026, PR China
| | - Yungang Bai
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
| | - Baichao Zhang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
| | - Yinchuan Wang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
| | - Ying Tan
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, PR China.
| | - Kun Xu
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.
| | - Pixin Wang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; University of Science and Technology of China, Hefei 230026, PR China
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Kubota K, Tomitaka Y. Large-Scale Inoculation and Evaluation Methods for Attenuated Plant Viruses. Methods Mol Biol 2019; 2028:261-72. [PMID: 31228120 DOI: 10.1007/978-1-4939-9635-3_15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
Cross-protection is a phenomenon in which a plant that is infected with a virus becomes immune to a secondary infection by the same or related viruses. Although molecular mechanisms underlying this phenomenon are not completely understood, cross-protection induced by an attenuated strain with mild symptoms has been successfully used to prevent damage by more severe strains. In the development and selection of an effective attenuated strain among candidate isolates, evaluating their infectivity and efficiency of cross-protection is important. We describe two protocols to check the infection efficiency and distribution in a plant based on immunostaining results. In addition, a practical inoculation method that uses a spray gun to apply attenuated viruses to a large number of seedlings is presented.
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Carneiro MS, Fracasso A, Lovison OVA, Barreto F, Barth AL. Evaluation of filter paper as a means to transport inactivated bacteria for identification using the MALDI-TOF MS system. J Microbiol Methods 2020; 171:105863. [PMID: 32035115 DOI: 10.1016/j.mimet.2020.105863] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 02/04/2020] [Accepted: 02/04/2020] [Indexed: 11/24/2022]
Abstract
A novel approach to transport inactivated bacteria in filter paper for identification in the MALDI-TOF MS was evaluated. Seventy four bacterial isolates were evaluated and the approach presented sensitivity of 97.3% and specificity of 100%. Inactivated bacteria in filter paper are a safer alternative to transport bacteria for MALDI-TOF MS identification.
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Affiliation(s)
- M S Carneiro
- Laboratório de Pesquisa em Resistência Bacteriana (LABRESIS), Centro De Pesquisa Experimental (CPE), Hospital de Clínicas de Porto Alegre (HCPA), R. Ramiro Barcelos, 2350, CEP 90035-903 Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Ciências Farmacêuticas (PPGCF), Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Ipiranga 2752, Porto Alegre, Brazil
| | - A Fracasso
- Laboratório de Pesquisa em Resistência Bacteriana (LABRESIS), Centro De Pesquisa Experimental (CPE), Hospital de Clínicas de Porto Alegre (HCPA), R. Ramiro Barcelos, 2350, CEP 90035-903 Porto Alegre, RS, Brazil
| | - O V A Lovison
- Laboratório de Pesquisa em Resistência Bacteriana (LABRESIS), Centro De Pesquisa Experimental (CPE), Hospital de Clínicas de Porto Alegre (HCPA), R. Ramiro Barcelos, 2350, CEP 90035-903 Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Ciências Farmacêuticas (PPGCF), Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Ipiranga 2752, Porto Alegre, Brazil
| | - F Barreto
- Laboratórios Federais de Defesa Agropecuária (LFDA), Estr. Ponta Grossa, 3036 - Ponta Grossa, CEP 91780-580 Porto Alegre, RS, Brazil
| | - A L Barth
- Laboratório de Pesquisa em Resistência Bacteriana (LABRESIS), Centro De Pesquisa Experimental (CPE), Hospital de Clínicas de Porto Alegre (HCPA), R. Ramiro Barcelos, 2350, CEP 90035-903 Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Ciências Farmacêuticas (PPGCF), Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Ipiranga 2752, Porto Alegre, Brazil.
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Werner D, Gassner AL, Marti J, Christen S, Wyss P, Weyermann C. Comparison of three collection methods for the sodium rhodizonate detection of gunshot residues on hands. Sci Justice 2020; 60:63-71. [PMID: 31924290 DOI: 10.1016/j.scijus.2019.09.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 08/05/2019] [Accepted: 09/15/2019] [Indexed: 11/28/2022]
Abstract
The aim of this study was to compare three gunshot residue (GSR) collection methods used in conjunction with chemographic detection applied by different regional Swiss police services. The specimens were collected from the hands of a shooter with either filter paper (Filter method) or adhesive foil. The adhesive foil was then either applied against photographic paper during visualisation (AF Photo method) or coated with a layer of polyvinyl alcohol (AF PVAL method). The experiments involved two conditions of the examined hands, i.e. dry and humidified. The residues were revealed using the sodium rhodizonate test (SRT). Preliminary tests assessing the possibility of conducting a confirmatory Scanning Electron Microscopy coupled to Energy Dispersive X-ray spectroscopy (SEM/EDX) analysis after the chemographic test were performed on a number of specimens by cutting positive spots and mounting them on stubs. Obtained results were compared in terms of effectiveness - number of positive spots, time requirements, quality of subsequent SEM-EDX analysis, ease of use and cost. The Filter method generally yielded a high-quality detection with both dry and humidified hands, as well as a simple, quick and efficient confirmation by SEM/EDX. The AF Photo performed well on dry hands, but not on humidified hands. The AF PVAL method performance was lower compared to the other methods in both examined conditions of the hands. The SEM/EDX analysis showed that the Filter and AF PVAL method provided satisfactory results when a sufficient carbon coating thickness was applied to the cuttings. It was also observed that the thinner the PVAL layer, the better the quality of the spectra and obtained images in SEM/EDX. Furthermore, the surface of the photographic paper did not seem to be conductive, even after the application of a thick layer of carbon. In conclusion, the Filter method gave the best overall results, but its application required slightly more time and expertise than the two other methods.
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Affiliation(s)
- Denis Werner
- Ecole des Sciences Criminelles, University of Lausanne, Lausanne, Switzerland.
| | - Anne-Laure Gassner
- Ecole des Sciences Criminelles, University of Lausanne, Lausanne, Switzerland
| | - Jorina Marti
- Ecole des Sciences Criminelles, University of Lausanne, Lausanne, Switzerland
| | | | - Philipp Wyss
- Zurich Forensic Science Institute, Zürich, Switzerland
| | - Céline Weyermann
- Ecole des Sciences Criminelles, University of Lausanne, Lausanne, Switzerland
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Monroe MN, Nikonowicz RC, Grande-Allen KJ. Heterogeneous multi-laminar tissue constructs as a platform to evaluate aortic valve matrix-dependent pathogenicity. Acta Biomater 2019; 97:420-427. [PMID: 31362141 DOI: 10.1016/j.actbio.2019.07.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 07/19/2019] [Accepted: 07/25/2019] [Indexed: 12/18/2022]
Abstract
Designing and constructing controlled in vitro cell culture platforms is imperative toward pinpointing factors that contribute to the development of calcific aortic valve disease. A 3D, laminar, filter paper-based cell culture system that was previously established as a method of analyzing valvular interstitial cell migration and protein expression was adapted here for studying the impact of specific extracellular matrix proteins on cellular viability and calcification proclivity. Hydrogels incorporating hyaluronan and collagen I, two prevalent valvular extracellular matrix proteins with altered pathological production, were designed with similar mechanics to parse out effects of the individual proteins on cell behavior. Laminar constructs containing varying combinations of discrete layers of collagen and hyaluronan were assembled to mimic native and pathological valve compositions. Proteinaceous and genetic expression patterns pertaining to cell viability and calcific potential were quantified via fluorescent imaging. A significant dose-dependency was observed, with increased collagen content associated with decreased viability and increased calcific phenotype. These results suggest that extracellular composition is influential in calcific aortic valve disease progression and will be key toward development of future tissue-engineered or pharmaceutical calcific aortic valve treatments. STATEMENT OF SIGNIFICANCE: Calcific aortic valve disease (CAVD), a widespread heart valve disorder, is characterized by fibrotic leaflet thickening and calcific nodule formation. This pathological remodeling is an active process mediated by the valvular interstitial cells (VICs). Currently, the only treatment available is surgical replacement of the valve - a procedure associated with significant long-term risk and morbidity. Development of effective alternate therapies is hindered by our poor understanding of CAVD etiology. Previous work has implicated the composition and mechanics of the extracellular matrix in the progression of CAVD. These individual factors and their magnitude of influence have not been extensively explored - particularly in 3D systems. Here, we have bridged this gap in understanding through the employment of a heterogeneous 3D filter-paper culture system.
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Wang F, Pi J, Li JY, Song F, Feng R, Wang XL, Wang YZ. Highly-efficient separation of oil and water enabled by a silica nanoparticle coating with pH-triggered tunable surface wettability. J Colloid Interface Sci 2019; 557:65-75. [PMID: 31514094 DOI: 10.1016/j.jcis.2019.08.114] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Revised: 08/30/2019] [Accepted: 08/31/2019] [Indexed: 11/29/2022]
Abstract
Environmentally switched superwetting surfaces that can be used for separating various oil/water mixtures are of particular interest due to the increasing difficulty and complexity in oily wastewater treatment. Here, a novel fluorine-free pH-responsive coating is prepared by surface modification of SiO2 nanoparticles with dimethyloctadecyl [3-(trimethoxysilyl) propyl] ammonium chloride and (N, N-dimethyl-3-aminopropyl) trimethoxysilane. With the assistance of polyethylene imine as a binder, such coating can be used for different porous substrates, e. g. cotton fabric and filter paper, to develop separation materials having tunable superhydrophilicity/superhydrophobicity and high antibacterial property. Due to the well-controlled surface wettability upon the pH variation, the as-prepared materials can effectively separate various types of oil/water mixtures with efficiency higher than 99.9%, including the layered oil/water mixture, water-in-oil emulsions and oil-in-water emulsions stabilized by different types of surfactants. Additionally, the materials can resist strong acid/base solutions and various organic solvents as well as 50-cycle mechanical abrasion and 120-cycle tape-peeling without losing anti-wetting performance. Featuring the tunable surface wettability, chemical/mechanical robustness, and antibacterial activity, such coating holds promising applications for treating various oil/water mixtures in harsh and biological-contamination conditions.
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Affiliation(s)
- Fang Wang
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Jing Pi
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Jing-Yu Li
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Fei Song
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Rui Feng
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiu-Li Wang
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Yu-Zhong Wang
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China.
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Zhang C, You T, Yang N, Gao Y, Jiang L, Yin P. Hydrophobic paper-based SERS platform for direct-droplet quantitative determination of melamine. Food Chem 2019; 287:363-368. [PMID: 30857711 DOI: 10.1016/j.foodchem.2019.02.094] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 02/19/2019] [Accepted: 02/21/2019] [Indexed: 11/27/2022]
Abstract
A novel hydrophobic-SERS substrate platform based on silver nanoparticles (AgNPs) functionalized commercially available filter paper was reported. Compared with conventional substrates, not only could this novel SERS substrate meet the requirements of simple and large-scale preparation, but also realized direct droplet-detection with reusable property. In this work, the fabrication, physical characterization, and SERS sensitivity of the substrates to spot-on food determination were studied. The experimental results show the method exhibited high reproducibility with less than 9% spot-to-spot variation in Raman intensity. Furthermore, the method was successfully applied to detect melamine in diluted milk with the instrument detection limit (IDL) down to 1 ppm in a linear correlation (1 ppm-1000 ppm). In addition, this SERS substrate could also be applied successfully in other fields, such as the determination of pesticide (thiram) and dye (malachite green) in real environment.
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Affiliation(s)
- Chenmeng Zhang
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China
| | - Tingting You
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China
| | - Nan Yang
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China
| | - Yukun Gao
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China
| | - Li Jiang
- College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China.
| | - Penggang Yin
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China.
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Abstract
Arne Tiselius' moving boundary electrophoresis method was still in general use in 1951 when this personal history begins, although zonal electrophoresis with a variety of supporting media (e.g., filter paper or starch grains) was beginning to replace it. This chapter is an account of 10 years of experiments carried out by the author during which molecular sieving gel electrophoresis was developed and common genetic variants of two proteins, haptoglobin and transferrin, were discovered in normal individuals. Most of the figures are images of pages from the author's laboratory notebooks, which are still available, so that some of the excitement of the time and the humorous moments are perhaps apparent. Alkaline gels, acidic gels with and without denaturants, vertical gels, two-dimensional gels and gels with differences in starch concentration are presented. The subtle details that can be discerned in these various gels played an indispensable role in determining the nature of the change in the haptoglobin gene (Hp) that leads to the polymeric series characteristic of Hp 2/Hp 2 homozygotes. Where possible the names of scientific friends who made this saga of gel electrophoresis so memorable and enjoyable are gratefully included.
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Karadas O, Mese G, Ozcivici E. Cytotoxic Tolerance of Healthy and Cancerous Bone Cells to Anti-microbial Phenolic Compounds Depend on Culture Conditions. Appl Biochem Biotechnol 2019; 188:514-26. [PMID: 30536030 DOI: 10.1007/s12010-018-02934-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 11/30/2018] [Indexed: 12/15/2022]
Abstract
Carnosol and carnosic acid are polyphenolic compounds found in rosemary and sage with known anti-oxidant, anti-inflammatory, and anti-microbial properties. Here, we addressed the potential use of carnosol and carnosic acid for in vitro bone tissue engineering applications, specifically depending on their cytotoxic effects on bone marrow stromal and stem cells, and osteosarcoma cells in monolayer and 3D cultures. Carnosol and carnosic acid displayed a bacteriostatic effect on Gram-positive bacteria, especially on S. aureus. The viability results indicated that bone marrow stromal cells and bone marrow stem cells were more tolerant to the presence of carnosol compared to osteosarcoma cells. 3D culture conditions increased this tolerance further for healthy cells, while not affecting the cytotoxic potential of carnosol for osteosarcoma cells. Carnosic acid was found to be more cytotoxic for all cell types used in the study. Results suggest that phenolic compounds might have potential use as anti-microbial and anti-carcinogenic agents for bone tissue engineering with further optimization for controlled release.
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Ibarra-González I, Cruz-Bautista I, Bello-Chavolla OY, Vela-Amieva M, Pallares-Méndez R, Ruiz de Santiago Y Nevarez D, Salas-Tapia MF, Rosas-Flota X, González-Acevedo M, Palacios-Peñaloza A, Morales-Esponda M, Aguilar-Salinas CA, Del Bosque-Plata L. Optimization of kidney dysfunction prediction in diabetic kidney disease using targeted metabolomics. Acta Diabetol 2018; 55:1151-1161. [PMID: 30173364 DOI: 10.1007/s00592-018-1213-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 08/09/2018] [Indexed: 01/05/2023]
Abstract
AIMS Metabolomics have been used to evaluate the role of small molecules in human disease. However, the cost and complexity of the methodology and interpretation of findings have limited the transference of knowledge to clinical practice. Here, we apply a targeted metabolomics approach using samples blotted in filter paper to develop clinical-metabolomics models to detect kidney dysfunction in diabetic kidney disease (DKD). METHODS We included healthy controls and subjects with type 2 diabetes (T2D) with and without DKD and investigated the association between metabolite concentrations in blood and urine with eGFR and albuminuria. We also evaluated performance of clinical, biochemical and metabolomic models to improve kidney dysfunction prediction in DKD. RESULTS Using clinical-metabolomics models, we identified associations of decreased eGFR with body mass index (BMI), uric acid and C10:2 levels; albuminuria was associated to years of T2D duration, A1C, uric acid, creatinine, protein intake and serum C0, C10:2 and urinary C12:1 levels. DKD was associated with age, A1C, uric acid, BMI, serum C0, C10:2, C8:1 and urinary C12:1. Inclusion of metabolomics increased the predictive and informative capacity of models composed of clinical variables by decreasing Akaike's information criterion, and was replicated both in training and validation datasets. CONCLUSIONS Targeted metabolomics using blotted samples in filter paper is a simple, low-cost approach to identify outcomes associated with DKD; the inclusion of metabolomics improves predictive capacity of clinical models to identify kidney dysfunction and DKD-related outcomes.
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Affiliation(s)
- Isabel Ibarra-González
- Unidad de Genética de la Nutrición, Instituto de Investigaciones Biomédicas, UNAM-Instituto Nacional de Pediatría, Mexico City, Mexico
- Laboratorio de Errores Innatos del Metabolismo y Tamiz, Instituto Nacional de Pediatría, Mexico City, Mexico
| | - Ivette Cruz-Bautista
- Unidad de Investigación en Enfermedades Metabólicas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
- Departamento de Endocrinología y Metabolismo, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
- Tecnológico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Monterrey, NL, Mexico
| | - Omar Yaxmehen Bello-Chavolla
- Unidad de Investigación en Enfermedades Metabólicas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
- MD/PhD (PECEM) Program, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Marcela Vela-Amieva
- Laboratorio de Errores Innatos del Metabolismo y Tamiz, Instituto Nacional de Pediatría, Mexico City, Mexico
| | - Rigoberto Pallares-Méndez
- Unidad de Investigación en Enfermedades Metabólicas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Diana Ruiz de Santiago Y Nevarez
- Unidad de Investigación en Enfermedades Metabólicas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - María Fernanda Salas-Tapia
- Unidad de Investigación en Enfermedades Metabólicas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Ximena Rosas-Flota
- Unidad de Investigación en Enfermedades Metabólicas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Mayela González-Acevedo
- Unidad de Investigación en Enfermedades Metabólicas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Adriana Palacios-Peñaloza
- Unidad de Investigación en Enfermedades Metabólicas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Mario Morales-Esponda
- Unidad de Investigación en Enfermedades Metabólicas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Carlos Alberto Aguilar-Salinas
- Unidad de Investigación en Enfermedades Metabólicas, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
- Departamento de Endocrinología y Metabolismo, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
- Tecnológico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Monterrey, NL, Mexico
| | - Laura Del Bosque-Plata
- Laboratorio de Nutrigenética y Nutrigenómica, Instituto Nacional de Medicina Genómica, Periférico Sur No. 4809, Col. Arenal Tepepan, 14610, Mexico City, Mexico.
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Huits R, Van Den Bossche D, Eggermont K, Lotgering E, Feyens AM, Potters I, Jacobs J, Van Esbroeck M, Cnops L, Bottieau E. Incidence of Zika virus infection in a prospective cohort of Belgian travellers to the Americas in 2016. Int J Infect Dis 2018; 78:39-43. [PMID: 30368020 DOI: 10.1016/j.ijid.2018.10.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Revised: 10/15/2018] [Accepted: 10/19/2018] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND The incidence rate of Zika virus (ZIKV) infection in travellers from non-endemic areas to the Americas during the ZIKV outbreak in 2016 is unknown. METHODS Belgian adults who planned to travel to South America, Central America, and the Caribbean were recruited prospectively to study the incidence and characteristics of ZIKV. Demographic data and sera were collected at baseline. Participants were trained to collect capillary blood on filter paper (BFP). When ill during travel, the participants completed a questionnaire and they sampled BFP for post-hoc analysis. All symptomatic participants were screened for ZIKV using ZIKV-specific RT-PCR on serum or urine, or BFP, and antibody detection assays (ELISA). Follow-up sera of asymptomatic travellers, obtained at least 20 days post travel, were tested by ZIKV ELISA only. All positive ELISA results were subject to confirmation by virus neutralization testing (VNT). RESULTS Forty-nine participants completed follow-up: 38 women and 11 men, with a median age of 32 years (range 19-64 years). Travel destinations were countries in South America (n=20), Central America (n=24), and the Caribbean (n=5). The total travel duration was 67.8 person-months. Illness was reported by 24 participants (49.0%). ZIKV infection was confirmed in nine cases, by RT-PCR (n=5) and by VNT (n=4). Only one of nine ZIKV cases (11.1%) was asymptomatic. The ZIKV incidence rate was 17.0% (95% confidence interval 7.8-32.2%) per month of travel. CONCLUSIONS The ZIKV incidence rate in adult travellers from non-endemic countries to the epidemic territories during the 2016 outbreak was high. Asymptomatic ZIKV infection was rare in this population.
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Affiliation(s)
- Ralph Huits
- Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium.
| | | | - Kaat Eggermont
- Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Erica Lotgering
- Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Anne-Marie Feyens
- Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Idzi Potters
- Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Jan Jacobs
- Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium; Department of Microbiology and Immunology, University of Leuven, Leuven, Belgium
| | - Marjan Van Esbroeck
- Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Lieselotte Cnops
- Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Emmanuel Bottieau
- Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
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Wang Q, Liu Y, Bai Y, Yao S, Wei Z, Zhang M, Wang L, Wang L. Superhydrophobic SERS substrates based on silver dendrite-decorated filter paper for trace detection of nitenpyram. Anal Chim Acta 2018; 1049:170-178. [PMID: 30612648 DOI: 10.1016/j.aca.2018.10.039] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 08/26/2018] [Accepted: 10/18/2018] [Indexed: 01/22/2023]
Abstract
In the present work, highly sensitive Raman detection of nitenpyram using superhydrophobic filter paper as substrates is introduced. The process is simple, and efficient. By sequentially coating silver dendrites and Octyltrimethoxysilane (OTMOS) on filter paper, we produced highly active surface-enhanced Raman scattering (SERS) substrates which show advancing and receding water contact angles of θA/θR = 159°/156°. Nitenpyram, a type of pesticides popularly used in agriculture, can be easily detected with the detection limit as low as 1 nM using the superhydrophobic filter paper as SERS substrates, which validates their use in Raman applications.
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Affiliation(s)
- Qinzhi Wang
- School of Chemistry and Chemical Engineering, Advanced Institute of Engineering Science for Intelligent Manufacturing, Guangzhou University, Guangzhou, 510006, China; College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Yingnan Liu
- College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Yaowen Bai
- College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Siyu Yao
- College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Zijie Wei
- College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Min Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Liming Wang
- School of Chemistry and Chemical Engineering, Advanced Institute of Engineering Science for Intelligent Manufacturing, Guangzhou University, Guangzhou, 510006, China.
| | - Li Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China.
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Leekrajang M, Sae-Ung P, Vilaivan T, Hoven VP. Filter paper grafted with epoxide-based copolymer brushes for activation-free peptide nucleic acid conjugation and its application for colorimetric DNA detection. Colloids Surf B Biointerfaces 2018; 173:851-859. [PMID: 30551301 DOI: 10.1016/j.colsurfb.2018.09.067] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 09/07/2018] [Accepted: 09/26/2018] [Indexed: 12/13/2022]
Abstract
Epoxide-bearing filter paper was first prepared by surface-initiated reversible addition-fragmentation chain transfer (RAFT) copolymerization of glycidyl methacrylate (GMA) and poly(ethylene glycol)methacrylate (PEGMA). Without the need for activation step, the capture peptide nucleic acid (PNA) probes carrying a C-terminal lysine modification can be directly immobilized on the surface-grafted poly[glycidyl methacrylate-ran-poly(ethylene glycol)methacrylate] (P(GMA-ran-PEGMA)) through ring-opening of epoxide groups in the GMA repeating units by amino groups in the PNA's structure. The success of P(GMA-ran-PEGMA) grafting on the filter paper and subsequent PNA immobilization was confirmed by fluorescence microscopy, Fourier transform-infrared spectroscopy and X-ray photoelectron spectroscopy. Colorimetric detection with signal amplification upon DNA hybridization relies on sandwich-hybridization assay employing another biotinylated PNA strand as a reporter probe together with streptavidin-horseradish peroxidase conjugate (SA-HRP) and o-phenylenediamine (OPD) substrate. It was found that increasing ionic strength during the DNA hybridization step by addition of NaCl can increase the signal intensity, which can be visualized by naked eye. The sensing platform showed the best performance in preventing non-specific adsorption from the non-complementary DNA and discriminating between complementary and single-mismatched targets of at least 50 fmol without the requirement for stringent hybridization or washing condition. This superior ability to suppress non-specific adsorption of non-target DNA as well as other non-DNA components may be explained as a result of hydrophilic PEGMA repeating units in the surface-grafted copolymer.
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Affiliation(s)
- Malinee Leekrajang
- Program in Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Pornpen Sae-Ung
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Tirayut Vilaivan
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Voravee P Hoven
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand; Center of Excellence in Materials and Bio-interfaces, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
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38
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Jain S, Bhanjana G, Heydarifard S, Dilbaghi N, Nazhad MM, Kumar V, Kim KH, Kumar S. Enhanced antibacterial profile of nanoparticle impregnated cellulose foam filter paper for drinking water filtration. Carbohydr Polym 2018; 202:219-26. [PMID: 30286995 DOI: 10.1016/j.carbpol.2018.08.130] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 08/23/2018] [Accepted: 08/24/2018] [Indexed: 01/22/2023]
Abstract
Filtration is a promising water treatment method to purify drinking water. To develop highly efficient drinking water filter paper, water-resistant cellulose foam paper with a high wet strength property was fabricated using diverse metal oxide (e.g., copper oxide (CuO), zinc oxide (ZnO), and silver oxide (Ag2O)) nanoparticles. These nanoparticles were synthesized using the hydrothermal reaction method. Their morphological structures were studied using a field emission scanning electron microscope (FESEM). The presence of coated nanoparticles on the cellulose foam filter was verified by energy dispersive X-ray spectroscopy (EDX) methods. The antibacterial performance of different types of modified cellulose foam filters was studied against E. coli, P. aeruginosa, B. subtilis, and B. cereus strains using the zone of inhibition test. The antibacterial profile of the cellulose foam filter impregnated with Ag2O nanoparticles, when tested against different types of bacteria, exhibited higher antibacterial activity than the cellulose foam filter impregnated with ZnO and CuO nanoparticles.
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Al-Kappany YM, Abbas IE, Devleesschauwer B, Dorny P, Jennes M, Cox E. Seroprevalence of anti-Toxoplasma gondii antibodies in Egyptian sheep and goats. BMC Vet Res 2018; 14:120. [PMID: 29606142 PMCID: PMC5879817 DOI: 10.1186/s12917-018-1440-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 03/21/2018] [Indexed: 12/04/2022] Open
Abstract
Background Toxoplasmosis is a zoonotic disease that affects a wide range of animals, including small ruminants. Sheep and goats are considered as biological indicators for the contamination of the environment with Toxoplasma gondii oocysts. In addition, in countries such as Egypt, where sheep and goat meat is frequently consumed, T. gondii infection in small ruminants may also pose a public health risk. To establish baseline estimates of the prevalence of T. gondii infection in Egyptian small ruminants, we used an indirect immunofluorescence assay (IFA) and an enzyme-linked immunosorbent assay (ELISA) to assess the seroprevalence in 398 sheep from four Egyptian governorates (Cairo, Giza, Dakahlia and Sharkia) and in 100 goats from Dakahlia. The positive and negative agreements of both tests were calculated and the true prevalence was estimated using a Bayesian approach. Results The true prevalence of antibodies to T. gondii as determined by both tests was higher in Egyptian goats (62%) than in sheep for each province (between 4.1 and 26%). Sheep slaughtered at the Cairo abattoir had the lowest true prevalence (4.1%), while true prevalences in Dakahlia, Giza and Sharkia governorates (26%, 23% and 12%, respectively) were substantially higher. Conclusions The high prevalence of antibodies to T. gondii may indicate an important role of goat and sheep in the transmission of human toxoplasmosis in Egypt, given the habit of eating undercooked grilled mutton.
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Affiliation(s)
- Yara M Al-Kappany
- Parasitology Department, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Ibrahim E Abbas
- Parasitology Department, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Brecht Devleesschauwer
- Department of Public Health and Surveillance, Scientific Institute of Public Health (WIV-ISP), Rue Juliette Wytsmanstraat 14, 1050, Brussels, Belgium.
| | - Pierre Dorny
- Laboratory of Parasitology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.,Department of Biomedical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Malgorzata Jennes
- Laboratory of Immunology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - Eric Cox
- Laboratory of Immunology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
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Khan MS, Misra SK, Dighe K, Wang Z, Schwartz-Duval AS, Sar D, Pan D. Electrically-receptive and thermally-responsive paper-based sensor chip for rapid detection of bacterial cells. Biosens Bioelectron 2018; 110:132-140. [PMID: 29605712 DOI: 10.1016/j.bios.2018.03.044] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 03/19/2018] [Indexed: 01/15/2023]
Abstract
Although significant technological advancements have been made in the development of analytical biosensor chips for detecting bacterial strains (E. coli, S. Mutans and B. Subtilis), critical requirements i.e. limit of detection (LOD), fast time of response, ultra-sensitivity with high reproducibility and good shelf-life with robust sensing capability have yet to be met within a single sensor chip. In order to achieve these criteria, we present an electrically-receptive thermally-responsive (ER-TR) sensor chip comprised of simple filter paper used as substrate coated with composite of poly(N-isopropylacrylamide) polymer (PNIPAm) - graphene nanoplatelet (GR) followed by evaporation of Au electrodes for capturing both Gram-positive (S. mutans and B. subtilis) and Gram-negative (E. coli) bacterial cells in real-time. Autoclave water, tap water, lake water and milk samples were tested with ER-TR chip with and without bacterial strains at varying concentration range 101-105 cells/mL. The sensor was integrated with in-house built printed circuit board (PCB) to transmit/receive electrical signals. The interaction of E. coli, S. mutans and B. subtilis cells with fibers of PNIPAm-GR resulted in a change of electrical resistance and the readout was monitored wirelessly in real-time using MATLAB algorithm. Finally, prepared ER-TR chip exhibited the reproducibility of 85-97% with shelf-life of up to four weeks after testing with lake water sample.
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Affiliation(s)
- Muhammad S Khan
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA; Biomedical Research Center, Carle Foundation Hospital, Urbana, IL, USA
| | - Santosh K Misra
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA; Biomedical Research Center, Carle Foundation Hospital, Urbana, IL, USA.
| | - Ketan Dighe
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA; Biomedical Research Center, Carle Foundation Hospital, Urbana, IL, USA
| | - Zhen Wang
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA; Biomedical Research Center, Carle Foundation Hospital, Urbana, IL, USA
| | - Aaron S Schwartz-Duval
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA; Biomedical Research Center, Carle Foundation Hospital, Urbana, IL, USA
| | - Dinabandhu Sar
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA; Biomedical Research Center, Carle Foundation Hospital, Urbana, IL, USA
| | - Dipanjan Pan
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA; Biomedical Research Center, Carle Foundation Hospital, Urbana, IL, USA; Beckman Institute for Advanced Science & Technology, University of Illinois at Urbana-Champaign, IL, USA; Department of Materials Science and Engineering, University of Illinois-Urbana Champaign, IL, USA; Carle Illinois College of Medicine, Urbana, IL 61801, USA.
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Candy K, Nicolas P, Andriantsoanirina V, Izri A, Durand R. In vitro efficacy of five essential oils against Pediculus humanus capitis. Parasitol Res 2017; 117:603-609. [PMID: 29264717 DOI: 10.1007/s00436-017-5722-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 12/12/2017] [Indexed: 11/29/2022]
Abstract
Treatment of head lice has relied mainly on the use of topical insecticides. Today, conventional topical pediculicides have suffered considerable loss of activity worldwide. There is increasing interest in the use of natural products such as essential oils for head louse control, and many of them are now incorporated into various over-the-counter products presented as pediculicides, often without proper evaluation. The aim of the present study was to assess the in vitro efficacy of five essential oils against adults of Pediculus humanus capitis using a contact filter paper toxicity bioassay. The chemical composition of the essential oils from wild bergamot, clove, lavender, tea tree, and Yunnan verbena was analyzed by gas chromatography-mass spectrometry. All treatments and controls were replicated three times on separate occasions over a period of 11 months. In all, 1239 living lice were collected from the scalp of 51 subjects, aged from 1 to 69 years. Clove oil, diluted either in coco oil or sunflower oil, demonstrated the best adulticidal activity, reaching > 90% mortality within 2 h in lice submitted to a 30-min contact. Yunnan verbena oil diluted in coco oil showed also a significant efficacy. Other essential oils showed a lower efficacy. The oil's major component(s) differed according to the tested oils and appeared chemically diverse. In the case of clove oil, the eugenol appeared as the main component. This study confirmed the potential interest of some of the essential oils tested, but not all, as products to include possibly in a pediculicidal formulation.
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Affiliation(s)
- Kerdalidec Candy
- Parasitology-Mycology Department, AP-HP, Avicenne Hospital, Bobigny, France.,UMR 190, Unité des virus émergents, Faculté de Médecine-Timone, Université Aix-Marseille, Marseille, France
| | - Patrick Nicolas
- Unit of Pharmacology, AP-HP, Avicenne Hospital, Bobigny, France
| | | | - Arezki Izri
- Parasitology-Mycology Department, AP-HP, Avicenne Hospital, Bobigny, France.,UMR 190, Unité des virus émergents, Faculté de Médecine-Timone, Université Aix-Marseille, Marseille, France.,UFR SMBH, Université Paris 13, Bobigny, France
| | - Rémy Durand
- Parasitology-Mycology Department, AP-HP, Avicenne Hospital, Bobigny, France. .,UFR SMBH, Université Paris 13, Bobigny, France. .,UMR216, Mère et enfant face aux infections tropicales, Faculté des Sciences Pharmaceutiques et Biologiques, Université Paris Descartes, Paris, France. .,Laboratoire de Parasitologie-Mycologie, Hôpital Avicenne, 125 rue de Stalingrad, 93009, Bobigny, France.
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Dastogeer KMG, Li H, Sivasithamparam K, Jones MGK, Wylie SJ. A simple and rapid in vitro test for large-scale screening of fungal endophytes from drought-adapted Australian wild plants for conferring water deprivation tolerance and growth promotion in Nicotiana benthamiana seedlings. Arch Microbiol 2017; 199:1357-1370. [PMID: 28733885 DOI: 10.1007/s00203-017-1411-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 06/13/2017] [Accepted: 07/14/2017] [Indexed: 10/19/2022]
Abstract
Some fungal endophytes confer novel phenotypes and enhance existing ones in plants, including tolerance to water deprivation stress. A range of fungal endophytes was isolated from wild Nicotiana plants growing in arid parts of northern Australia. These were screened for ability to enhance water deprivation stress tolerance by inoculating seedlings of the model plant N. benthamiana in two in vitro tests. Sixty-eight endophyte isolates were co-cultivated with N. benthamiana seedlings on either damp filter paper or on agar medium before being subjected to water deprivation. Seventeen isolates were selected for further testing under water deprivation conditions in a sand-based test in a glasshouse. Only two fungal isolates, Cladosporium cladosporioides (E-162) and an unknown fungus (E-284), significantly enhanced seedling tolerance to moisture deprivation consistently in both in vitro and sand-based tests. Although a strongly significant correlation was observed between any two screening methods, the result of filter paper test was more strongly reflected (r = 0.757, p < 0.001) in results of the glasshouse test, indicating its relative suitability over the agar-based test. In another experiment, the same 17 isolates carried forward to the sand-based test used in the glasshouse screening test were inoculated to N. benthamiana plants in pots in a nutrient-limiting environment to test their influence on growth promotion. Isolates related to C. cladosporioides, Fusarium equiseti, and Thozetella sp. promoted seedling growth by increasing shoot length and biomass. The fungal isolate E-162 (C. cladosporioides) significantly enhanced moisture deprivation tolerance as well as promoted seedling growth.
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Affiliation(s)
- Khondoker M G Dastogeer
- Plant Biotechnology Group, Plant Virology, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, 6150, Australia
- Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
| | - Hua Li
- Plant Biotechnology Group, Plant Virology, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, 6150, Australia
| | - Krishnapillai Sivasithamparam
- Plant Biotechnology Group, Plant Virology, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, 6150, Australia
| | - Michael G K Jones
- Plant Biotechnology Group, Plant Virology, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, 6150, Australia
| | - Stephen J Wylie
- Plant Biotechnology Group, Plant Virology, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, 6150, Australia.
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Shi R, Panthee DR. A novel plant DNA extraction method using filter paper-based 96-well spin plate. Planta 2017; 246:579-584. [PMID: 28707084 DOI: 10.1007/s00425-017-2743-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 07/10/2017] [Indexed: 06/07/2023]
Abstract
A simple, low cost and safe method using homemade filter paper-based 96-well spin plates and homemade solutions was developed for high throughput plant DNA extraction to use in molecular marker analysis. A low cost and safe method was developed for high throughput extraction of plant DNA for molecular marker analysis. In this method, we describe a simple way to prepare 96-well spin plate using filter paper, a plant material product for DNA binding. Such filter paper-based spin plate can combine with homemade non-toxic buffers for high throughput extraction of plant DNA. We confirmed that filter paper is an efficient solid-phase DNA binding material and comparable to silicon-based glass fiber filters adopted in commercial DNA extraction kits, and that plant DNA extracted by this method can be readily used as template for PCR. The efficacy of this method was also fully demonstrated by molecular marker analysis in segregating populations of tomato. Due to greatly reduced expense compared to commercial kits, this method is of great value for small labs with limited resources.
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Affiliation(s)
- Rui Shi
- Department of Horticultural Science, North Carolina State University, Mountain Horticultural Crops Research and Extension Center, 455 Research Drive, Mills River, NC, 28759, USA
| | - Dilip R Panthee
- Department of Horticultural Science, North Carolina State University, Mountain Horticultural Crops Research and Extension Center, 455 Research Drive, Mills River, NC, 28759, USA.
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Wei W, Huang Q. Rapid fabrication of silver nanoparticle-coated filter paper as SERS substrate for low-abundance molecules detection. Spectrochim Acta A Mol Biomol Spectrosc 2017; 179:211-215. [PMID: 28249235 DOI: 10.1016/j.saa.2017.02.052] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 02/22/2017] [Accepted: 02/22/2017] [Indexed: 06/06/2023]
Abstract
Silver nanoparticles (Ag NPs) were fabricated on the fibers of the filter paper by the reaction between silver nitrate (AgNO3) and hydrazine hydrate (N2H4·H2O). By using the Ag NPs-coated paper, the limit of detection as low as 10-11M for Rhodamine B (RhB) and 10-10M for crystal violet (CV) was achieved. Moreover, the uniformity, reproducibility and stability of the Ag NPs-coated paper were also involved. Meanwhile, the detection of 10-4-10-6M moxifloxacin in deionized water and tap water was also carried out successfully by using the paper-based substrates. The fabrication process is easy to handle, cost-efficient and the as-prepared paper-based SERS substrate is ideal for rapid and simple detection of low-abundance molecules.
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Affiliation(s)
- Wenxian Wei
- Testing Center, Yangzhou University, Yangzhou City, Jiangsu 225009, China.
| | - Qingli Huang
- Testing Center, Yangzhou University, Yangzhou City, Jiangsu 225009, China
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Bolais PF, Vignoles P, Pereira PF, Keim R, Aroussi A, Ismail K, Dardé ML, Amendoeira MR, Mercier A. Toxoplasma gondii survey in cats from two environments of the city of Rio de Janeiro, Brazil by Modified Agglutination Test on sera and filter-paper. Parasit Vectors 2017; 10:88. [PMID: 28212681 PMCID: PMC5316176 DOI: 10.1186/s13071-017-2017-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 02/07/2017] [Indexed: 11/10/2022] Open
Abstract
Background Toxoplasma gondii is a protozoan with a worldwide distribution, in warm-blood animals, including humans. Local conditions and environmental disturbances may influence transmission dynamics of a zoonotic agent. This study evaluates the epidemiology of T. gondii based on toxoplasmosis prevalence in two populations of cats living in distinct urbanization conditions in Rio de Janeiro, Brazil. Methods Among 372 domestic cats sampled, 265 were from a public shelter located downtown Rio and 107 from a relatively preserved wild environment in a residential area. Sera and eluates from dried blood spots were tested for detection of IgG antibodies against T. gondii by modified agglutination test (MAT). Results Antibodies to T. gondii were detected in 32/265 (12.08%) animals from the public shelter and in 4/107 (3.74%) cats from the residential area. Identical results were observed for sera and eluates. Conclusions Filter paper provides a reliable accurate alternative storage option when conditions of sample collection and transportation in the field are unfavorable. The significantly lower prevalence in the residential area is discussed in terms of environmental, biological and behavioral features.
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Affiliation(s)
- Paula F Bolais
- Univ. Limoges, INSERM UMR-S 1094 Tropical Neuroepidemiology, Institute of Neuroepidemiology and Tropical Neurology, 2 Rue du Dr. Marcland, Limoges, 87025, France. .,Toxoplasmosis and other Protozoosis Laboratory of Oswaldo Cruz Institute, Av. Brasil 4365, Rio de Janeiro, 21045-900, Brazil.
| | - Philippe Vignoles
- Univ. Limoges, INSERM UMR-S 1094 Tropical Neuroepidemiology, Institute of Neuroepidemiology and Tropical Neurology, 2 Rue du Dr. Marcland, Limoges, 87025, France
| | - Pamela F Pereira
- Toxoplasmosis and other Protozoosis Laboratory of Oswaldo Cruz Institute, Av. Brasil 4365, Rio de Janeiro, 21045-900, Brazil
| | - Rafael Keim
- Quatro Elementos Veterinary Medicine and Environmental consulting, Rua Coronel Moreira Cesar, 211 Bl. 2/502, Niteroi, 24.230-052, Brazil
| | - Abdelkrim Aroussi
- Univ. Limoges, INSERM UMR-S 1094 Tropical Neuroepidemiology, Institute of Neuroepidemiology and Tropical Neurology, 2 Rue du Dr. Marcland, Limoges, 87025, France
| | - Khadja Ismail
- Univ. Limoges, INSERM UMR-S 1094 Tropical Neuroepidemiology, Institute of Neuroepidemiology and Tropical Neurology, 2 Rue du Dr. Marcland, Limoges, 87025, France
| | - Marie-Laure Dardé
- Univ. Limoges, INSERM UMR-S 1094 Tropical Neuroepidemiology, Institute of Neuroepidemiology and Tropical Neurology, 2 Rue du Dr. Marcland, Limoges, 87025, France
| | - Maria Regina Amendoeira
- Toxoplasmosis and other Protozoosis Laboratory of Oswaldo Cruz Institute, Av. Brasil 4365, Rio de Janeiro, 21045-900, Brazil
| | - Aurélien Mercier
- Univ. Limoges, INSERM UMR-S 1094 Tropical Neuroepidemiology, Institute of Neuroepidemiology and Tropical Neurology, 2 Rue du Dr. Marcland, Limoges, 87025, France
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Abstract
Expansins are proteins that loosen plant cell walls but lack enzymatic activity. Here, we describe two protocols tailored to measure the biomechanical activity of bacterial expansin. The first assay relies on weakening of filter paper by expansin. The second assay is based on induction of creep (long-term, irreversible extension) of plant cell wall samples.
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Affiliation(s)
- Daniel J Cosgrove
- Department of Biology, Pennsylvania State University, 350A Frear North Bldg., University Park, PA, 16802, USA.
| | - Nathan K Hepler
- Department of Biology, Pennsylvania State University, 350A Frear North Bldg., University Park, PA, 16802, USA
| | - Edward R Wagner
- Department of Biology, Pennsylvania State University, 350A Frear North Bldg., University Park, PA, 16802, USA
| | - Daniel M Durachko
- Department of Biology, Pennsylvania State University, 350A Frear North Bldg., University Park, PA, 16802, USA
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Su L, Yang L, Huang S, Li Y, Su X, Wang F, Bo C, Wang ET, Song A. Variation in the Gut Microbiota of Termites (Tsaitermes ampliceps) Against Different Diets. Appl Biochem Biotechnol 2016; 181:32-47. [PMID: 27457759 DOI: 10.1007/s12010-016-2197-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 07/13/2016] [Indexed: 11/29/2022]
Abstract
Termites are well recognized for their thriving on recalcitrant lignocellulosic diets through nutritional symbioses with gut-dwelling microbiota; however, the effects of diet changes on termite gut microbiota are poorly understood, especially for the lower termites. In this study, we employed high-throughput 454 pyrosequencing of 16S V1-V3 amplicons to compare gut microbiotas of Tsaitermes ampliceps fed with lignin-rich and lignin-poor cellulose diets after a 2-week-feeding period. As a result, the majority of bacterial taxa were shared across the treatments with different diets, but their relative abundances were modified. In particular, the relative abundance was reduced for Spirochaetes and it was increased for Proteobacteria and Bacteroides by feeding the lignin-poor diet. The evenness of gut microbiota exhibited a significant difference in response to the diet type (filter paper diets < corn stover diets < wood diets), while their richness was constant, which may be related to the lower recalcitrance of this biomass to degradation. These results have important implications for sampling and analysis strategies to probe the lignocellulose degradation features of termite gut microbiota and suggest that the dietary lignocellulose composition could cause shifting rapidly in the termite gut microbiota.
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Affiliation(s)
- Lijuan Su
- College of Life Sciences, Henan Agricultural University, Zhengzhou, Henan, 450002, China
| | - Lele Yang
- College of Life Sciences, Henan Agricultural University, Zhengzhou, Henan, 450002, China
| | - Shi Huang
- BioEnergy Genome Center, CAS Key Laboratory of Biofuels and Shandong Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong, 266101, China
| | - Yan Li
- College of Life Sciences, Henan Agricultural University, Zhengzhou, Henan, 450002, China
| | - Xiaoquan Su
- BioEnergy Genome Center, CAS Key Laboratory of Biofuels and Shandong Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong, 266101, China
| | - Fengqin Wang
- College of Life Sciences, Henan Agricultural University, Zhengzhou, Henan, 450002, China
- Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Zhengzhou, Henan, 450002, China
| | - Cunpei Bo
- BioEnergy Genome Center, CAS Key Laboratory of Biofuels and Shandong Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong, 266101, China
| | - En Tao Wang
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, 11340, México D.F., Mexico.
| | - Andong Song
- College of Life Sciences, Henan Agricultural University, Zhengzhou, Henan, 450002, China.
- Key Laboratory of Enzyme Engineering of Agricultural Microbiology, Ministry of Agriculture, Zhengzhou, Henan, 450002, China.
- , No. 93, Nongye Road, Zhengzhou, Henan Province, China.
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Pollock AJ, Allen DB, Wiebe D, Eickhoff J, MacDonald M, Baker M. Development of filter paper hemoglobin A1c assay applicable to newborn screening. Clin Chim Acta 2016; 457:24-6. [PMID: 27016455 DOI: 10.1016/j.cca.2016.03.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Revised: 03/18/2016] [Accepted: 03/18/2016] [Indexed: 01/12/2023]
Abstract
PURPOSE Gestational diabetes influences risk for future metabolic disease including type 2 diabetes. Hemoglobin A1c (HbA1c) measurement assesses hemoglobin A glycosylation, and could theoretically be used as a test to estimate gestational glucose exposure. HbA1c assay on dried blood spots (DBS) is needed before potential application to statewide newborn screening (NBS) population studies. The study aimed to establish a reliable method to measure HbA1c on NBS DBS specimens. De-identified blood was used to generate trials to evaluate stability of HbA1c in DBS, optimal elution time, and stability of eluted blood. RESULTS Analysis of DBS stability HbA1c measurements from 3 to 6days after collection overestimated HbA1c values by a bias factor between 0.83 and 0.87. Sixty minutes of elution time produced maximal reproducibility and minimal bias of results. Within assay standard deviation: 0.058; average bias: -0.02%. Stability of eluted blood did not vary significantly between days 0-2 after DBS elution. CONCLUSIONS Measurement of HbA1c levels on DBS from human blood is feasible. Results suggest new method using DBS to measure HbA1c level with the following characteristics: optimal time for sample analysis 3-6days after collection, elution time of 60min and eluted blood analysis within 2days of elution. Measurement of neonatal HbA1c could provide insight regarding the infant's in utero exposure to glucose.
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Affiliation(s)
- Allison J Pollock
- University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792, USA.
| | - David B Allen
- University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792, USA
| | - Donald Wiebe
- University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792, USA
| | - Jens Eickhoff
- University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792, USA
| | - Michael MacDonald
- University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792, USA
| | - Mei Baker
- University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792, USA; Wisconsin State Laboratory of Hygiene, 2601 Agriculture Dr, Madison, WI 53718, USA
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Kinoshita K, Kuze N, Kobayashi T, Miyakawa E, Narita H, Inoue-Murayama M, Idani G, Tsenkova R. Detection of urinary estrogen conjugates and creatinine using near infrared spectroscopy in Bornean orangutans (Pongo Pygmaeus). Primates 2015; 57:51-9. [PMID: 26561334 DOI: 10.1007/s10329-015-0501-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Accepted: 10/16/2015] [Indexed: 11/28/2022]
Abstract
For promoting in situ conservation, it is important to estimate the density distribution of fertile individuals, and there is a need for developing an easy monitoring method to discriminate between physiological states. To date, physiological state has generally been determined by measuring hormone concentration using radioimmunoassay or enzyme immunoassay (EIA) methods. However, these methods have rarely been applied in situ because of the requirements for a large amount of reagent, instruments, and a radioactive isotope. In addition, the proper storage of the sample (including urine and feces) on site until analysis is difficult. On the other hand, near infrared (NIR) spectroscopy requires no reagent and enables rapid measurement. In the present study, we attempted urinary NIR spectroscopy to determine the estrogen levels of orangutans in Japanese zoos and in the Danum Valley Conservation Area, Sabah, Malaysia. Reflectance NIR spectra were obtained from urine stored using a filter paper. Filter paper is easy to use to store dried urine, even in the wild. Urinary estrogen and creatinine concentrations measured by EIA were used as the reference data of partial least square (PLS) regression of urinary NIR spectra. High accuracies (R(2) > 0.68) were obtained in both estrogen and creatinine regression models. In addition, the PLS regressions in both standards showed higher accuracies (R(2) > 0.70). Therefore, the present study demonstrates that urinary NIR spectra have the potential to estimate the estrogen and creatinine concentrations.
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Affiliation(s)
- Kodzue Kinoshita
- Primate Research Institute, Kyoto University, 41-2 Kanrin, Inuyama, Aichi, 484-8506, Japan.
| | - Noko Kuze
- Japan Society for the Promotion of Science, Kojimachi Business Center Building, 5-3-1 Kojimachi, Chiyoda, Tokyo, 102-0083, Japan.,The National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki, 305-0005, Japan
| | - Toshio Kobayashi
- Zoorasia Yokohama Zoological Gardens, 1175-1 Kami-Shirane, Yokohama, Kanagawa, 241-0001, Japan
| | - Etsuko Miyakawa
- Zoorasia Yokohama Zoological Gardens, 1175-1 Kami-Shirane, Yokohama, Kanagawa, 241-0001, Japan.,Yokohama-city Kanazawa Zoo, 5-15-1 Kamariyahigashi, Kanazawa, Yokohama, Kanagawa, 236-0042, Japan
| | - Hiromitsu Narita
- Kushiro City Zoo, 11 Shimonini-shibetsu, Akan, Kushiro, Hokkaido, 085-0204, Japan
| | - Miho Inoue-Murayama
- Wildlife Research Center, Kyoto University, 2-24 Tanaka-Sekiden, Sakyo, Kyoto, 606-8203, Japan
| | - Gen'ichi Idani
- Wildlife Research Center, Kyoto University, 2-24 Tanaka-Sekiden, Sakyo, Kyoto, 606-8203, Japan
| | - Roumiana Tsenkova
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe, Hyogo, 657-8501, Japan
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50
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Chen Q, Bao H, Zhang L, Chen G. Far infrared-assisted encapsulation of filter paper strips in poly(methyl methacrylate) for proteolysis. Electrophoresis 2015; 37:493-7. [PMID: 26389537 DOI: 10.1002/elps.201500358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 09/13/2015] [Accepted: 09/14/2015] [Indexed: 11/10/2022]
Abstract
Filter paper strips were enclosed between two poly(methyl methacrylate) plates to fabricate paper-packed channel microchips under pressure in the presence of far infrared irradiation. After the enclosed paper strip was oxidized by periodate, trypsin was covalently immobilized in them to fabricate microfluidic proteolysis bioreactor. The feasibility and performance of the unique bioreactor were demonstrated by digesting BSA and lysozyme. The results were comparable to those of conventional in-solution proteolysis while the digestion time was significantly reduced to ∼18 s. The suitability of the microfluidic paper-based bioreactors to complex proteins was demonstrated by digesting human serum.
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Affiliation(s)
- Qiwen Chen
- Department of Pharmaceutical Analysis, School of Pharmacy, Fudan University, Shanghai, P. R. China
| | - Huimin Bao
- Department of Pharmaceutical Analysis, School of Pharmacy, Fudan University, Shanghai, P. R. China
| | - Luyan Zhang
- Department of Pharmaceutical Analysis, School of Pharmacy, Fudan University, Shanghai, P. R. China
| | - Gang Chen
- Department of Pharmaceutical Analysis, School of Pharmacy, Fudan University, Shanghai, P. R. China
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