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Zhang Y, Liang H, Wang X, Yu Y, Cao Y, Guo M, Lin B. Phosphorus Modulated Peroxidase-Like Activity of Carbon Dots for Colorimetric Detection of Acid Phosphatase. Appl Spectrosc 2024:37028241238246. [PMID: 38529537 DOI: 10.1177/00037028241238246] [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] [Indexed: 03/27/2024]
Abstract
The precise regulation of nanoenzyme activity is of great significance for application to biosensing analysis. Herein, the peroxidase-like activity of carbon dots was effectively modulated by doping phosphorus, which was successfully employed for sensitive, selective detection of acid phosphatase (ACP). Phosphorus-doped carbon dots (P-CDs) with excellent peroxidase-like activity were synthesized by a one-pot hydrothermal method, and the catalytic activity could be easily modulated by controlling the additional amount of precursor phytic acid. P-CDs could effectively catalyze the oxidation of colorless 3,3',5,5'-tetramethylbenzidine (TMB) to blue TMB oxidation products in the presence of hydrogen peroxide. While ACP was able to catalyze the hydrolysis of L-ascorbyl-2-phosphate trisodium salt (AAP) to produce ascorbic acid (AA), which inhibited the peroxidase-like activity of P-CDs, by combining P-CDs nanoenzymes and ACP-catalyzed hydrolysis the colorimetric method was established for ACP detection. The absorbance variation showed a good linear relationship with ACP concentration in the range of 0.4-4.0 mU/mL with a limit of detection at 0.12 mU/mL. In addition, the method was successfully applied to detect ACP in human serum samples with recoveries in the range of 98.7-101.6%. The work provides an effective strategy for regulating nanoenzymes activity and a low-cost detection technique for ACP.
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Affiliation(s)
- Yongmei Zhang
- Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, School of Chemistry, South China Normal University, Guangzhou, Guangdong, China
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Yildirim K, Atas C, Tanyel Akcit E, Licina M, Koyuncu Ozyurt O, Gun MA, Simsek E, Coban AY. Nitrate Reductase Assay for Rapid Determination of Methicillin-Resistant Staphylococcus aureus Clinical Isolates. Lab Med 2024; 55:174-178. [PMID: 37352501 DOI: 10.1093/labmed/lmad056] [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: 06/25/2023] Open
Abstract
OBJECTIVE To evaluate the performance of nitrate reductase assay (NRA), a rapid, colorimetric method for the determination of methicillin resistance in Staphylococcus aureus isolates obtained from the culture collection of the Akdeniz University Hospital Central Laboratory, Antalya, Türkiye. MATERIALS AND METHODS Identification for all 290 S aureus isolates at the species level was performed via matrix-assisted laser desorption/ionization-time of flight. Isolates were tested with NRA for methicillin resistance. The cefoxitin broth microdilution (BMD) method recommended by the Clinical and Laboratory Standards Institute was used as the reference method in the study. S aureus ATCC 29213 and S aureus ATCC 43300 strains were used for quality control. RESULTS According to Food and Drug Administration criteria, the category agreement between NRA and BMD was found to be 100%. The essential agreement between both methods was determined to be 96.20%. There is no minor, major, or extremely major discrepancy between both methods. CONCLUSION The results show that NRA is a rapid, practical, and reliable colorimetric method for detecting MRSA.
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Affiliation(s)
- Kubra Yildirim
- Akdeniz University Tuberculosis Research Center, Antalya, Türkiye
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Akdeniz University, Antalya, Türkiye
| | - Cemilenur Atas
- Department of Medical Biotechnology, Institute of Health Sciences, Akdeniz University, Antalya, Türkiye
| | - Esra Tanyel Akcit
- Akdeniz University Tuberculosis Research Center, Antalya, Türkiye
- Department of Medical Biotechnology, Institute of Health Sciences, Akdeniz University, Antalya, Türkiye
| | - Majda Licina
- Department of Medical Biotechnology, Institute of Health Sciences, Akdeniz University, Antalya, Türkiye
| | | | | | - Ece Simsek
- Akdeniz University Tuberculosis Research Center, Antalya, Türkiye
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Akdeniz University, Antalya, Türkiye
- Department of Medical Microbiology, Akdeniz University, Antalya, Türkiye
| | - Ahmet Yilmaz Coban
- Akdeniz University Tuberculosis Research Center, Antalya, Türkiye
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Akdeniz University, Antalya, Türkiye
- Department of Medical Microbiology, Akdeniz University, Antalya, Türkiye
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Sasaki T, Tahara S, Morikawa M, Igarashi T, Sadamasu Y, Ushiyama K, Yamajima Y, Kobayashi C. [Improvement of Nitrite Analysis Method in Food Products]. Shokuhin Eiseigaku Zasshi 2023; 64:21-28. [PMID: 36858588 DOI: 10.3358/shokueishi.64.21] [Citation(s) in RCA: 1] [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] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
The conventional analysis method has problems with extraction efficiency, operability, and reproducibility. In this study, we attempted to solve these problems and improve the analytical method to obtain sufficient extraction efficiency and good operability and accuracy. The conventional method was able to get sufficient extraction in dried meat products, where the extraction efficiency of the conventional method was low, by increasing the concentration of sodium hydroxide solution at the time of homogenization. Suction filtration after adding the defoaming agent was added allowed for accurate volume adjustment. The turbidity of the extract caused by insufficient addition of zinc acetate solution was removed by increasing the amount of zinc acetate solution that was added. Turbidity caused by starch was removed by adding pancreatin. The RSD of the quantitative values was improved by adding sodium hydroxide solution and 80-90℃ water and immediately homogenizing. Furthermore, by changing the dilution factor of the extract solution in the colorimetric method, the inhibition of coloration by reducing substances was suppressed, and more accurate quantitative values could be obtained than with the conventional method. The recovery rate was 78.5-105% (RSD 0.7-5.8%), which was a good result. This method was considered to be a useful analytical method that can contribute to improving the inspection accuracy of nitrite ion analysis.
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Jiang J, Li Y, Liu L, Chen L, Zhao J, Streb C, Song YF. First Ultrathin Pure Polyoxometalate 2D Material as a Peroxidase-Mimicking Catalyst for Detecting Oxidative Stress Biomarkers. ACS Appl Mater Interfaces 2023; 15:1486-1494. [PMID: 36578107 DOI: 10.1021/acsami.2c15579] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Although two-dimensional (2D) materials with ultrathin geometry and extraordinary electrical attributes have attracted substantial concern, exploiting new-type 2D materials is still a great challenge. In this work, an unprecedented single-layer pure polyoxometalate (POM) 2D material (2D-1) was prepared by ultrasonically exfoliating a one-dimensional (1D)-chain heterometallic crystalline germanotungstate Na4[Ho(H2O)6]2[Fe4(H2O)2(pic)6Ge2W20O72]·16H2O (1) (Hpic = picolinic acid). The 1D polymeric chain of 1 is assembled from particular {Ge2W20}-based [Fe4(H2O)2(pic)6Ge2W20O72]10- segments through bridging [Ho(H2O)6]3+ cations. 2D-1 is formed by π-π interaction driving force among adjacent 1D polymeric chains of 1. Also, the peroxidase-mimicking properties of 2D-1 toward detecting H2O2 were evaluated and good detection result was observed with a limit of detection (LOD) of 58 nM. Density functional theory (DFT) calculation further confirms that 2D-1 displays outstanding catalytic activity and active sites are located on Fe centers and Hpic ligands. Under the catalysis of uricase, uric acid can be transformed to allantoin and H2O2, and then, H2O2 oxidizes TMB to its blue ox-TMB in the presence of 2D-1 as a catalyst. Then, we utilized this cascade reaction to detect uric acid, which also exhibits prominent results. This research opens a door to prepare ultrathin pure POM 2D materials and broadens the scope of potential applications of POMs in biology and iatrology.
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Affiliation(s)
- Jun Jiang
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, China
| | - Yanzhou Li
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, China
| | - Lulu Liu
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, China
| | - Lijuan Chen
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, China
| | - Junwei Zhao
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, China
| | - Carsten Streb
- Institute of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Yu-Fei Song
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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Yao D, Bi H, Gong H, Lai H, Lu S. Determination of Pb 2+ by Colorimetric Method Based on Catalytic Amplification of Ag Nanoparticles Supported by Covalent Organic Frameworks. Nanomaterials (Basel) 2022; 12:2866. [PMID: 36014731 PMCID: PMC9414748 DOI: 10.3390/nano12162866] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/13/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
In this paper, covalent organic frameworks (COFs) are prepared by solvothermal synthesis using 1,3,5-benzenetricarboxaldehyde and benzidine as ligands. Then, using COFs as a template, AgCOFs with high catalytic activity is prepared by in situ loading silver nanoparticles (AgNC) on the surface of COFs by sodium borohydride reduction method. AgCOFs are characterized by TEM, SEM, FTIR and XRD. At the same time, the catalytic ability of AgCOFs for trisodium citrate-AgNO3 nanosilver reaction is studied. The results show that AgCOFs can catalyze the reaction of trisodium citrate-AgNO3 to generate silver nanoparticles (AgNPs). The solution color of the system gradually changes from colorless to yellow, and the absorbance value increases. Based on the catalytic reaction of AgCOFs and the regulation effect of nucleic acid aptamer reaction on AgCOFs, a new "on-off-on" colorimetric analysis platform is constructed and applied to the detection of trace Pb2+ in water samples. This analytical platform is simple, sensitive and selective. Finally, the catalytic mechanism of the system is discussed to verify the feasibility of constructing a colorimetric analysis platform.
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Rohani Bastami T, Bayat M, Paolesse R. Naked-Eye Detection of Morphine by Au@Ag Nanoparticles-Based Colorimetric Chemosensors. Sensors (Basel) 2022; 22:s22052072. [PMID: 35271219 PMCID: PMC8914838 DOI: 10.3390/s22052072] [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: 12/31/2021] [Revised: 02/18/2022] [Accepted: 03/04/2022] [Indexed: 05/12/2023]
Abstract
In this study, we report a novel and facile colorimetric assay based on silver citrate-coated Au@Ag nanoparticles (Au@AgNPs) as a chemosensor for the naked-eye detection of morphine (MOR). The developed optical sensing approach relied on the aggregation of Au@Ag NPs upon exposure to morphine, which led to an evident color variation from light-yellow to brown. Au@Ag NPs have been prepared by two different protocols, using high- and low-power ultrasonic irradiation. The sonochemical method was essential for the sensing properties of the resulting nanoparticles. This facile sensing method has several advantages including excellent stability, selectivity, prompt detection, and cost-effectiveness.
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Affiliation(s)
- Tahereh Rohani Bastami
- Department of Chemical Engineering and Energy, Quchan University of Technology, Quchan 94771-67335, Iran;
- Correspondence: (T.R.B.); (R.P.)
| | - Mansour Bayat
- Department of Chemical Engineering and Energy, Quchan University of Technology, Quchan 94771-67335, Iran;
| | - Roberto Paolesse
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via Della Ricerca Scientifica 1, 00133 Rome, Italy
- Correspondence: (T.R.B.); (R.P.)
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Yanagisawa H, Sasaki K, Sasaki Y, Omata A, Ichino R, Fujimaki S. Photometric Screening of Tetrabromobisphenol A in Resin Using Iron(III) Nitrate/Hexacyanoferrate(III) Mixture as a Colorimetric Reagent. ANAL SCI 2021; 37:1815-1819. [PMID: 34148922 DOI: 10.2116/analsci.21n021] [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: 11/23/2022]
Abstract
This study aims to provide a simple way to identify the possibility of tetrabromobisphenol A (TBBPA) present in polymers without the need for complicated separation with expensive equipment. Since the presence of phenolic hydroxyl groups is known to be identifiable by the reduction of Fe3+ to Fe2+ in a ferric coloring reagent, the possibility of TBBPA being present in a polymer can be screened by a photometric measurement. A mixed solution of iron(III) nitrate and potassium hexacyanide(III) acid was used as a ferric coloring reagent. With this method, the concentration of TBBPA can be estimated from the photometric absorbance corresponding to the depth of the blue color produced by reduction of the ferric reagent in the presence of Fe(NO3)3. The limit of detection (LOD) was determined to be approximately 2 mg/kg using the Student's t-test (99% confidence), and a reproducibility of approximately 3% was determined by the relative standard deviation (RSD) from measurements of calibration samples (n = 7). Furthermore, TBBPA in actual polymer samples was screened without the need for any complex processing steps. Because this colorimetric method measures TBBPA by detecting phenolic groups, it may overestimate the TBBPA concentration in the presence of other similar phenolic substances. Nonetheless, this simple colorimetric method should help to quickly identify the presence of TBBPA in various polymers.
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ZEHRA T, AHSAN F, VERSIANI MA, WAHID S, JAHANGIR S, SHAH MR. Puerarin-coated gold nanoparticles (PUE-AuNPs) synthesized via green synthetic route: a new colorimetric probe for the detection of ciprofloxacin. Turk J Chem 2021; 45:1814-1827. [PMID: 38144601 PMCID: PMC10734733 DOI: 10.3906/kim-2106-4] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 12/20/2021] [Accepted: 07/21/2021] [Indexed: 12/26/2023] Open
Abstract
Puerarin-coated gold nanoparticles (PUE-AuNPs) synthesized via green synthetic route, a new colorimetric sensor, efficiently detected the ciprofloxacin (CP) in tap water and cow milk samples. The PUE-AuNPs were characterized by UV-visible, FTIR, AFM, and DLS techniques and were found to be spherical with an average size of approximately 19-20 nm. FTIR spectrum confirms that functional groups such as -OH, -C=O, -CO and -C=C were responsible for the reduction of gold (III) chloride trihydrate. These functional groups acted as capping agents to form AuNPs. The PUE-AuNPs sensor was proved to be selective and sensitive for the detection of CP through colorimetric method within the concentration of 1 to 1000 μM and the limit of detection was 51 μM. This colorimetric sensor is simple, cost-effective, and selective towards CP detection in environmental (tap water and milk) samples.
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Affiliation(s)
- Tasneem ZEHRA
- Department of Chemistry, Federal Urdu University of Arts, Science & Technology, Karachi,
Pakistan
- Basic Science, Mathematics, English & Humanities Department, Dawood University of Engineering and Technology, Karachi,
Pakistan
| | - Faiqa AHSAN
- Department of Chemistry, Federal Urdu University of Arts, Science & Technology, Karachi,
Pakistan
| | - Muhammad Ali VERSIANI
- Department of Chemistry, Federal Urdu University of Arts, Science & Technology, Karachi,
Pakistan
| | - Sana WAHID
- Department of Chemistry, Federal Urdu University of Arts, Science & Technology, Karachi,
Pakistan
| | - Sajid JAHANGIR
- Department of Chemistry, Federal Urdu University of Arts, Science & Technology, Karachi,
Pakistan
| | - Muhammad Raza SHAH
- H.E.J. Research Institute of Chemistry, International Center of Chemical and Biological Sciences, University of Karachi, Karachi,
Pakistan
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Dai H, Wang Y, Ren C, Ji X, Zhou Y, Zhang X, Yin F, Yin W, Tao Z. A new method for detecting Na + , K + -ATPase activity by ICP-MS: Quantitative analysis on the inhibitory effect of rhein on Na + , K + -ATPase activity by ICP-MS in HCT116 cells. Biomed Chromatogr 2021; 35:e5199. [PMID: 34144633 DOI: 10.1002/bmc.5199] [Citation(s) in RCA: 3] [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] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 06/02/2021] [Accepted: 06/10/2021] [Indexed: 11/11/2022]
Abstract
Rhein is an active component from Chinese herbal medicine. It can cause diarrhea by inhibiting Na+ , K+ -ATPase activity on intestinal epithelial cells, thus decreasing the re-absorption of Na+ from intestinal tract to blood. However, when this Na+ , K+ -ATPase inhibition was quantitated by a colorimetric method that measures ATPase-catalyzed release of inorganic phosphorus, the data obtained were inconsistent and showed great variation. We developed a novel method using inductively coupled plasma mass spectrometry (ICP-MS) to quantitate the amount of intracellular Rb+ . This method largely mimics the 86 RbCl tracer flux assay, but it uses non-radioactive RbCl as a flux substrate. The results demonstrated that this method has better precision and accuracy than the conventional colorimetric method. More importantly, this method is free from radioactive substances, which is expected to make it safer and more convenient than the radioactive 86 RbCl tracer flux method. In conclusion, the ICP-MS method for Na+ , K+ -ATPase activity determination is novel and accurate. It can also provide a reference for studying the transport of other metal ions across membranes under biological conditions.
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Affiliation(s)
- Hui Dai
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yulin Wang
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Chenchen Ren
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Xiaojun Ji
- State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
| | - Yueke Zhou
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Xinyue Zhang
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Fangzhou Yin
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Wu Yin
- State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
| | - Zhonghua Tao
- Department of Medical Oncology, Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
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Kamnoet P, Aeungmaitrepirom W, Menger RF, Henry CS. Highly selective simultaneous determination of Cu(ii), Co(ii), Ni(ii), Hg(ii), and Mn(ii) in water samples using microfluidic paper-based analytical devices. Analyst 2021; 146:2229-2239. [PMID: 33595555 PMCID: PMC8284785 DOI: 10.1039/d0an02200d] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [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] [Indexed: 12/16/2022]
Abstract
A new paper-based analytical device design was fabricated by a wax printing method for simultaneous determination of Cu(ii), Co(ii), Ni(ii), Hg(ii), and Mn(ii). Colorimetry was used to quantify these heavy metal ions using bathocuproine (Bc), dimethylglyoxime (DMG), dithizone (DTZ), and 4-(2-pyridylazo) resorcinol (PAR) as complexing agents. The affinity of complexing agents to heavy metal ions is dependent on the formation constant (Kf). To enhance the selectivity for heavy metal ion determination, the new device was designed with two pretreatment zones, where masking agents remove the interfering ions. It was found that two pretreatment zones worked better than a single pretreatment zone at removing interferences. The reaction time, sample and complexing agent volumes, and complexing agent concentrations were optimized. The analytical results were achieved with the lowest detectable concentrations of 0.32, 0.59, 5.87, 0.20, and 0.11 mg L-1 for Cu(ii), Co(ii), Ni(ii), Hg(ii), and Mn(ii), respectively. The linear ranges were found to be 0.32-63.55 mg L-1 (Cu(ii)), 0.59-4.71 mg L-1 (Co(ii)), 5.87-352.16 mg L-1 (Ni(ii)), 0.20-12.04 mg L-1 (Hg(ii)), and 0.11-0.55 mg L-1 (Mn(ii)). The lowest detectable concentration and linearity for the five metal ions allow the application of this device for the determination of heavy metal ions in various water samples. The sensor showed high selectivity and efficiency for simultaneous determination of Cu(ii), Co(ii), Ni(ii), Hg(ii), and Mn(ii) in drinking, tap, and pond water samples on a single device and detection with the naked eye. The results illustrated that the proposed sensor showed good accuracy and precision agreement with the standard ICP-OES method.
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Affiliation(s)
- Pornphimon Kamnoet
- Environmental Analysis Research Unit (EARU), Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
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Alladin-Mustan BS, Liu Y, Li Y, de Almeida DRQ, Yuzik J, Mendes CF, Gibbs JM. Reverse transcription lesion-induced DNA amplification: An instrument-free isothermal method to detect RNA. Anal Chim Acta 2021; 1149:238130. [PMID: 33551053 DOI: 10.1016/j.aca.2020.12.005] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 12/01/2020] [Accepted: 12/04/2020] [Indexed: 10/22/2022]
Abstract
One challenge in point-of-care (POC) diagnostics is the lack of room-temperature methods for RNA detection based on enzymatic amplification and visualization steps. Here we perform reverse transcription lesion-induced DNA amplification (RT-LIDA), an isothermal amplification method that only requires T4 DNA ligase. RT-LIDA involves the RNA-templated ligation of DNA primers to form complementary DNA (cDNA) followed by toehold-mediated strand displacement of the cDNA and its exponential amplification via our isothermal ligase chain reaction LIDA. Each step is tuned to proceed at 28 °C, which falls within the range of global room temperatures. Using RT-LIDA, we can detect as little as ∼100 amol target RNA and can distinguish RNA target from total cellular RNA. Finally, we demonstrate that the resulting DNA amplicons can be detected colorimetrically, also at room temperature, by rapid, target-triggered disassembly of DNA-modified gold nanoparticles. This integrated amplification/detection platform requires no heating or visualization instrumentation, which is an important step towards realizing instrument-free POC testing.
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Affiliation(s)
| | - Yuning Liu
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6E 2G2
| | - Yimeng Li
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6E 2G2
| | - Daria R Q de Almeida
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6E 2G2
| | - Jesse Yuzik
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6E 2G2
| | - Camilla F Mendes
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6E 2G2
| | - Julianne M Gibbs
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6E 2G2.
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Font-I-Furnols M, Martín-Bernal R, Aluwé M, Bonneau M, Haugen JE, Mörlein D, Mörlein J, Panella-Riera N, Škrlep M. Feasibility of on/at Line Methods to Determine Boar Taint and Boar Taint Compounds: An Overview. Animals (Basel) 2020; 10:E1886. [PMID: 33076492 DOI: 10.3390/ani10101886] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 09/21/2020] [Accepted: 10/09/2020] [Indexed: 01/26/2023] Open
Abstract
Simple Summary Due to welfare issues, the physical castration of male pigs is decreasing, and the entire male pig production is increasing. Fattening entire male pigs requires control due to the possibility of accumulating off odour/flavour called boar taint, which is mainly due to two compounds - skatole and androstenone. If carcasses with boar taint reach the market, it can cause a negative consumer reaction which may have economic consequences for the whole meat chain. Thus, it is necessary to sort out carcasses at the slaughter line. Today, a sensory quality control (human nose method) is used in some slaughter plants for this purpose. Detection by physical or chemical methods is also envisaged. A colorimetric method to determine skatole has been used in Danish abattoirs for decades, but it is foreseen that it will soon be replaced by the laser diode thermal desorption ion source coupled with a mass spectrometry equipment that allows a fully automated classification based on skatole and androstenone levels at speed line, with a delay of less than 40 min. Other potential methods such as the electrochemical biosensors, rapid evaporative ionization mass spectroscopy and Raman spectroscopy, still need further development and validation for an application at abattoir level. Abstract Classification of carcasses at the slaughter line allows an optimisation of its processing and differentiated payment to producers. Boar taint is a quality characteristic that is evaluated in some slaughter plants. This odour and flavour is mostly present in entire males and perceived generally by sensitive consumers as unpleasant. In the present work, the methodologies currently used in slaughter plants for boar taint classification (colorimetric method and sensory quality control-human nose) and the methodologies that have the potential to be implemented on/at the slaughter line (mass spectrometry, Raman and biosensors) have been summarized. Their main characteristics are presented and an analysis of strengths, weaknesses, opportunities and threats (SWOT) has been carried out. From this, we can conclude that, apart from human nose, the technology that arises as very promising and available on the market, and that will probably become a substitute for the colorimetric method, is the tandem between the laser diode thermal desorption ion source and the mass spectrometry (LDTD-MS/MS) with automation of the sampling and sample pre-treatment, because it is able to work at the slaughter line, is fast and robust, and measures both androstenone and skatole.
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Chen W, Teng J, Yao L, Xu J, Liu G. Selection of Specific DNA Aptamers for Hetero-Sandwich-Based Colorimetric Determination of Campylobacter jejuni in Food. J Agric Food Chem 2020; 68:8455-8461. [PMID: 32663006 DOI: 10.1021/acs.jafc.0c02865] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Herein, a high-affinity single-stranded DNA aptamer (59 nt) against Campylobacter jejuni, defined as CJA1, was obtained using the whole-bacterium-based systemic evolution of ligands by exponential enrichment procedure. CJA1 was analyzed with a stable secondary structure and low dissociation constant (Kd) value of 1.37 ± 0.28 nM. The potential use of CJA1 was exemplified by the construction of a hetero-sandwich platform, in which C. jejuni was bound with a biotin-tagged CJA1 to perform a colorimetric reaction that is associated with visible color changes and detectable optical responses. Dependent upon this sensing platform, C. jejuni can be detected from 1.7 × 101 to 1.7 × 106 colony-forming units (CFU)/mL. The limit of detection (LOD) is obtained as 10 CFU/mL in PBS. The specificity study showed that the sensing platform is easy to distinguish C. jejuni from other common pathogens. Moreover, the C. jejuni-contaminated milk samples can also be accurately probed (LOD = 13 CFU/mL) without sacrificing its assay abilities, indicating the promising prospect of CJA1 in the fields of biosensing and diagnostics.
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Affiliation(s)
- Wei Chen
- Engineering Research Center of Food Bio-process, Ministry of Education (MOE), School of Food & Biological Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
- Research Center for Biomedical and Health Science, School of Life and Health, Anhui Science & Technology University, Fengyang, Chuzhou, Anhui 233100, People's Republic of China
| | - Jun Teng
- Engineering Research Center of Food Bio-process, Ministry of Education (MOE), School of Food & Biological Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58105, United States
| | - Li Yao
- Engineering Research Center of Food Bio-process, Ministry of Education (MOE), School of Food & Biological Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58105, United States
| | - Jianguo Xu
- Engineering Research Center of Food Bio-process, Ministry of Education (MOE), School of Food & Biological Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
| | - Guodong Liu
- Research Center for Biomedical and Health Science, School of Life and Health, Anhui Science & Technology University, Fengyang, Chuzhou, Anhui 233100, People's Republic of China
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Cheng Q, Yang Y, Peng Y, Liu M. Pt Nanoparticles with High Oxidase-Like Activity and Reusability for Detection of Ascorbic Acid. Nanomaterials (Basel) 2020; 10:E1015. [PMID: 32466542 PMCID: PMC7352317 DOI: 10.3390/nano10061015] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/21/2020] [Accepted: 05/22/2020] [Indexed: 12/21/2022]
Abstract
Noble metal nanoenzymes such as Pt, Au, Pd, etc. exhibit magnificent activity. However, due to the scarce reserves and expensive prices of precious metals, it is essential to investigate their enzyme-like activity and explore the possibility of their reuse. In this work, the oxidase-like activity and reusability of several Pt nanoparticles with different morphologies were detected. We compared the Pt nanoparticles (NPs) with a size of about 30 nm self-assembled by 5 nm Pt nanoparticles and Pt nanoparticles (Pt-0 HCl) with a diameter of about 5 nm, and found that their Michaelis-Menten constants (Km) were close and their initial performance similar, but the Pt NPs had better reusability. This was probably attributed to the stacked structure of Pt NPs, which was conducive to the substance transport and sufficient contact. At the same time, it was found that the size, dispersion, and organic substances adsorbed on the surface of Pt nanoparticles would have a significant impact on their reusability. A colorimetric detection method was designed using the oxidase-like activity of Pt NPs to detect ascorbic acid in triplicate. The limits of detection were 131 ± 15, 144 ± 14, and 152 ± 9 nM, with little difference. This research not only showed that the morphology of the catalyst could be changed and its catalytic performance could be controlled by a simple liquid phase synthesis method, but also that it had great significance for the reuse of Pt nanoenzymes in the field of bioanalysis.
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Affiliation(s)
- Qin Cheng
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; (Q.C.); (Y.P.); (M.L.)
- Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
| | - Yong Yang
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; (Q.C.); (Y.P.); (M.L.)
| | - Yusi Peng
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; (Q.C.); (Y.P.); (M.L.)
| | - Meng Liu
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; (Q.C.); (Y.P.); (M.L.)
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15
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Takeuchi S, Arai J, Nagafuji M, Hinata A, Kamakura T, Hoshino Y, Yukitake Y. Ultrasonographic confirmation of endotracheal intubation in extremely low birthweigh infants - secondary publication. Pediatr Int 2020; 62:175-179. [PMID: 31785124 DOI: 10.1111/ped.14069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 11/14/2018] [Revised: 10/04/2019] [Accepted: 11/27/2019] [Indexed: 11/29/2022]
Abstract
BACKGROUND The purpose of this study was to investigate the usefulness of ultrasonography (US) for confirmation of endotracheal tube (ETT) placement during resuscitation in extremely low birthweight (ELBW) infants. METHODS We conducted a retrospective review of the medical records of ELBW infants in whom ETT position was verified using US between June 2016 and September 2017. We investigated the backgrounds of the patients and US investigators, and the time required for the detection of exhaled carbon dioxide using the colorimetric method and US. RESULTS Eleven ELBW infants were evaluated using US by four neonatologists. The median duration required to determine the ETT position by the colorimetric method and US were 11 s and 3 s, respectively. In six ELBW infants, we were able to verify the ETT position more rapidly using US than using the colorimetric method, and were able to perform prompt resuscitation. Unnecessary reintubations were avoided in three ELBW infants. CONCLUSION Ultrasonography allowed the swift confirmation of the tracheal intubations. The colorimetric method yielded false negative results; in such cases, unnecessary reintubation could have been avoided if US was used. We assessed the mechanism of false negative results and performed appropriate resuscitation.
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Affiliation(s)
- Syusuke Takeuchi
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan.,Department of Pediatrics, University of Tsukuba Hospital, Mito, Japan
| | - Junichi Arai
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Motomichi Nagafuji
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan.,Department of Pediatrics, University of Tsukuba Hospital, Mito, Japan
| | - Ayako Hinata
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Tae Kamakura
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Yusuke Hoshino
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Yoshiya Yukitake
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
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16
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Wang F, Zhu J, Chen L, Zuo Y, Hu X, Yang Y. Autonomous and In Situ Ocean Environmental Monitoring on Optofluidic Platform. Micromachines (Basel) 2020; 11:E69. [PMID: 31936398 PMCID: PMC7019421 DOI: 10.3390/mi11010069] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 01/02/2020] [Accepted: 01/07/2020] [Indexed: 11/17/2022]
Abstract
Determining the distributions and variations of chemical elements in oceans has significant meanings for understanding the biogeochemical cycles, evaluating seawater pollution, and forecasting the occurrence of marine disasters. The primary chemical parameters of ocean monitoring include nutrients, pH, dissolved oxygen (DO), and heavy metals. At present, ocean monitoring mainly relies on laboratory analysis, which is hindered in applications due to its large size, high power consumption, and low representative and time-sensitive detection results. By integrating photonics and microfluidics into one chip, optofluidics brings new opportunities to develop portable microsystems for ocean monitoring. Optofluidic platforms have advantages in respect of size, cost, timeliness, and parallel processing of samples compared with traditional instruments. This review describes the applications of optofluidic platforms on autonomous and in situ ocean environmental monitoring, with an emphasis on their principles, sensing properties, advantages, and disadvantages. Predictably, autonomous and in situ systems based on optofluidic platforms will have important applications in ocean environmental monitoring.
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Affiliation(s)
- Fang Wang
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Jiaomeng Zhu
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Longfei Chen
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Yunfeng Zuo
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Xuejia Hu
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Yi Yang
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
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17
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Marín FR, Hernández-Ruiz J, Arnao MB. A colorimetric method for the determination of different functional flavonoids using 2,2'-azino-bis-(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) and peroxidase. Prep Biochem Biotechnol 2019; 49:1033-1039. [PMID: 31407950 DOI: 10.1080/10826068.2019.1650378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 12/26/2022]
Abstract
In many occasions it is necessary to use fast and simple methods, different to the chromatographic techniques, for the quantification of biomolecules such as flavonoids. Also, the flavonoid levels in some foodstuffs can be influenced by industrial extraction processes such as pressing and squeezing, resulting in modification of their functional value. For this purpose, we have developed a rapid method to analyze flavonoids, based on a coupling reaction between ABTS and flavonoid mediated by peroxidase. The present method can be used to detect and measure flavonoids with hydroxyl moieties on A- or B-rings, not adjacent to methoxy or oxo substitutions. The visible spectrum of the ABTS-flavonoid complex, the calibration curve (within the range 5-50 μM) and the molar absorption coefficients for isosakuranetin, isonaringin, rhoifolin, hyperoside, rutin, hesperetin, quercetin, kaempherol and naringenin are given. The method has been applied to complex culture media and is sensitive, accurate, quick and easy to apply. This method can be used in laboratories that do not have sophisticated and expensive techniques such as liquid chromatography and also as a quick, simple and inexpensive technique for student practice laboratories.
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Affiliation(s)
- Francisco R Marín
- Department of Applied Chemistry-Physics. Faculty of Science, University Autónoma of Madrid , Madrid , Spain
| | - Josefa Hernández-Ruiz
- Department of Plant Biology (Plant Physiology), Faculty of Biology, University of Murcia , Murcia , Spain
| | - Marino B Arnao
- Department of Plant Biology (Plant Physiology), Faculty of Biology, University of Murcia , Murcia , Spain
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18
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Lee M, Zhang H, Sha Y, Hegg A, Ugge GE, Vinterstare J, Škerlep M, Pärssinen V, Herzog SD, Björnerås C, Gollnisch R, Johansson E, Hu N, Nilsson PA, Hulthén K, Rengefors K, Langerhans RB, Brönmark C, Hansson LA. Low-latitude zooplankton pigmentation plasticity in response to multiple threats. R Soc Open Sci 2019; 6:190321. [PMID: 31417735 PMCID: PMC6689576 DOI: 10.1098/rsos.190321] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 07/02/2019] [Indexed: 05/20/2023]
Abstract
Crustacean copepods in high-latitude lakes frequently alter their pigmentation facultatively to defend themselves against prevailing threats, such as solar ultraviolet radiation (UVR) and visually oriented predators. Strong seasonality in those environments promotes phenotypic plasticity. To date, no one has investigated whether low-latitude copepods, experiencing continuous stress from UVR and predation threats, exhibit similar inducible defences. We here investigated the pigmentation levels of Bahamian 'blue hole' copepods, addressing this deficit. Examining several populations varying in predation risk, we found the lowest levels of pigmentation in the population experiencing the highest predation pressure. In a laboratory experiment, we found that, in contrast with our predictions, copepods from these relatively constant environments did show some changes in pigmentation subsequent to the removal of UVR; however, exposure to water from different predation regimes induced minor and idiosyncratic pigmentation change. Our findings suggest that low-latitude zooplankton in inland environments may exhibit reduced, but non-zero, levels of phenotypic plasticity compared with their high-latitude counterparts.
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Affiliation(s)
- Marcus Lee
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | - Huan Zhang
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
- Chinese Academy of Sciences, Institute of Hydrobiology, Wuhan, People's Republic of China
| | - Yongcui Sha
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | - Alexander Hegg
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | | | | | - Martin Škerlep
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | - Varpu Pärssinen
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | | | | | - Raphael Gollnisch
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | - Emma Johansson
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | - Nan Hu
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | - P. Anders Nilsson
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
- Department of Environmental and Life Sciences, Karlstad University, Karlstad, Sweden
| | - Kaj Hulthén
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
- Department of Biological Sciences and W.M. Keck Center for Behavioral Biology, North Carolina State University, Raleigh, NC, USA
| | - Karin Rengefors
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | - R. Brian Langerhans
- Department of Biological Sciences and W.M. Keck Center for Behavioral Biology, North Carolina State University, Raleigh, NC, USA
| | - Christer Brönmark
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
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Yang L, Chen HS, Song WL, Fang D. Effect of Defects on Diffusion Behaviors of Lithium-Ion Battery Electrodes: In Situ Optical Observation and Simulation. ACS Appl Mater Interfaces 2018; 10:43623-43630. [PMID: 30484635 DOI: 10.1021/acsami.8b15260] [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] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Lithium-ion batteries (LIBs) with high energy efficiency are urgently needed in various fields. For the LIBs electrodes, defects would be generated during the manufacturing processes and mechanical degradation and significantly impact the stability and performance of the LIBs. However, the effects of electrode defects on the electrochemical processes are still not clear. Herein, an in situ optical observation system is developed for monitoring the Li diffusion around the preintroduced defects in the commercial graphite electrodes. The experiments show that the gas-filled defects vertical to the direction of the Li diffusion would obviously decelerate the Li diffusion, whereas the electrolyte-filled defects parallel to the direction of the Li diffusion would accelerate the Li diffusion. In addition, finite element analysis (FEA) suggests, consistent with the experiments, a nonuniform distribution of local Li concentration around the defect. The equivalent diffusivity obtained by the FEA is also dependent on the configuration of the defects. The diffusivities of the electrolyte-filled parallel defect and gas-filled vertical defect are 12.6 and 11.0%, respectively. For the gas-filled defects, the size-effect calculation manifests that the equivalent diffusivity would decrease with the enlarged defect size, and the shape of the defects would substantially impact the decrease rate. The results directly reveal the mechanisms of the defect-induced diffusion behavior change in the electrodes by the new equivalent two-dimensional experiments, and the equivalent diffusivity would be useful for optimizing the electrode designs in LIBs.
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Affiliation(s)
- Le Yang
- China State Key Laboratory for Turbulence and Complex Systems, College of Engineering , Peking University , Beijing 100871 , China
| | | | | | - Daining Fang
- China State Key Laboratory for Turbulence and Complex Systems, College of Engineering , Peking University , Beijing 100871 , China
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20
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Abstract
Meat screening plays a significant role in human health and religion. But the identification methods for beef were little reported. In this work, a simple colorimetric method based on denaturation bubble-mediated strand exchange amplification (SEA) was developed for the rapid and sensitive identification of beef. The whole strategy was performed on a portable metal bath and the distinguishable color between positive and negative controls was observed directly by the naked eyes. The feasibility using crude extraction samples by a heating treatment in PBS for 2 min was evaluated in duck spiked by beef. The result demonstrated that the developed method could identify as low as 1% (w/w) beef/duck within 50 min. Meanwhile, the results showed the method had a good repeatability and specificity. Therefore, this assay allows for the rapid, sensitive, specific detection of beef, and can be recommended as an effective, promising strategy for on-site meat identification.
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Affiliation(s)
- Xuejiao Wang
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Chemistry and Molecular Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology
| | - Chunyu Yan
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Chemistry and Molecular Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology
| | - Manman Wei
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Chemistry and Molecular Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology
| | - Chao Shi
- College of Life Sciences, Qingdao University
| | - Shuyan Niu
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Chemistry and Molecular Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology
| | - Cuiping Ma
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Chemistry and Molecular Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology
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21
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Jiang J, Zhang B, Zhang C, Guan Y. A Novel Design Combining Isothermal Exponential Amplification and Gold-Nanoparticles Visualization for Rapid Detection of miRNAs. Int J Mol Sci 2018; 19:E3374. [PMID: 30373308 DOI: 10.3390/ijms19113374] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 10/22/2018] [Accepted: 10/25/2018] [Indexed: 11/17/2022] Open
Abstract
MicroRNAs (miRNAs) play important roles in a wide range of biological processes, and their aberrant expressions are associated with various diseases. The levels of miRNAs can be useful biomarkers for cellular events or disease diagnosis; thus, sensitive and selective detection of microRNAs is of great significance in understanding biological functions of miRNAs, early-phase diagnosis of cancers, and discovery of new targets for drugs. However, traditional approaches for the detection of miRNAs are usually laborious and time-consuming, with a low sensitivity. Here, we develop a simple, rapid, ultrasensitive colorimetric assay based on the combination of isothermal Exponential Amplification Reaction (EXPAR) and AuNP-labeled DNA probes for the detection of miRNAs (taking let-7a as a model analyte). In this assay, the presence of let-7a is converted to the reporter Y through EXPAR under isothermal conditions. The subsequent sandwich hybridization of the reporter Y with the AuNP-labeled DNA probes generates a red-to-purple color change. In other words, if the reporter Y is complementary to the AuNP-labeled DNA probes, the DNA-functionalized AuNPs will be aggregated, resulting in the change of solution color from red to purple/blue, while when the AuNP-labeled DNA probes are mismatched to the reporter Y, the solution remains red. This assay represents a simple, time-saving technique, and its results can be visually detected with the naked eye due to the colorimetric change. The method provides superior sensitivity, with a detection limit of 4.176 aM over a wide range from 1 nM to 1 aM under optimal conditions. The method also shows high selectivity for discriminating even single-nucleotide differences between let-7 miRNA family members. Notably, it is comparable to the most sensitive method reported to date, thus providing a promising alternative to standard approaches for the direct detection of let-7a miRNA. Importantly, through combination with specific templates, different miRNAs can be converted to the same reporter Y, which can hybridize with the same set of AuNP-labeled DNA probes to form sandwich hybrids. The color change of the solution can be observed in the presence of the target miRNA. This technique has potential as a routine method for assessing the levels of miRNAs, not only for let-7, but also for various miRNAs in the early phase of cancers. In addition, it can be a useful tool in biomedical research and clinical diagnosis, as well as diagnosis or surveillance programs in field conditions.
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Abstract
Chemical-responsive adhesive sensing chip is a new low-cost analytical platform that uses adhesive tape loaded with indicator reagents to detect or quantify the target analytes by directly sticking the tape to the samples of interest. The chemical-responsive adhesive sensing chips can be used with paper to analyze aqueous samples; they can also be used to detect and quantify solid, particulate, and powder analytes. The colorimetric indicators become immediately visible as the contact between the functionalized adhesives and target samples is made. The chemical-responsive adhesive sensing chip expands the capability of paper-based analytical devices to analyze solid, particulate, or powder materials via one-step operation. It is also a simpler alternative way, to the covalent chemical modification of paper, to eliminate indicator leaching from the dipstick-style paper sensors. Chemical-responsive adhesive chips can display analytical results in the form of colorimetric dot patterns, symbols, and texts, enabling clear understanding of assay results by even nonprofessional users. In this work, we demonstrate the analyses of heavy metal salts in silica powder matrix, heavy metal ions in water, and bovine serum albumin in an aqueous solution. The detection is one-step, specific, sensitive, and easy-to-operate.
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Affiliation(s)
- Weirui Tan
- Department of Chemical Engineering, Monash University , Wellington Road, Clayton, VIC 3800, Australia
| | - Liyuan Zhang
- Department of Chemical Engineering, Monash University , Wellington Road, Clayton, VIC 3800, Australia
| | - Wei Shen
- Department of Chemical Engineering, Monash University , Wellington Road, Clayton, VIC 3800, Australia
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23
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Abstract
Palladium is a highly valuable metal in automobile, chemical, and pharmaceutical industries. The metal is generally quantified by atomic absorption spectrometry or inductively coupled plasma mass spectrometry. These techniques are tedious and require expensive instruments that are operated mostly off site. As cost-effective and user-friendly alternatives to these techniques, we previously reported two practical fluorometric or colorimetric methods to quantify palladium. Both methods rely on the use of NaBH4, which cannot be stored in solution for more than 10 days. Commercially available solutions of NaBH4 are partially or fully degraded to di- or triborohydride species and cannot be used for palladium(0)-catalyzed allylic C-O bond cleavage for quantification purposes. Here, we report a new method that replaces NaBH4 with NH2NH2 for the palladium-catalyzed deallylation of fluorogenic and colorimetric chemodosimeter resorufin allyl ether. This method is slower but as sensitive as the most recent method from our laboratory. The method is selective for palladium and depends on the presence of tri(2-furyl)phosphine as a palladium ligand and NH2NH2 as a palladium-reducing reagent.
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Affiliation(s)
- Matthew Nieberding
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Matthew P. Tracey
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Kazunori Koide
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
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Ryu WK, Kim HW, Kim GD, Rhee HI. Rapid determination of capsaicinoids by colorimetric method. J Food Drug Anal 2016; 25:798-803. [PMID: 28987355 PMCID: PMC9328869 DOI: 10.1016/j.jfda.2016.11.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [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: 07/05/2016] [Revised: 11/03/2016] [Accepted: 11/04/2016] [Indexed: 11/06/2022] Open
Abstract
Capsaicinoids, the pungent component of chili peppers, are generally analyzed by precise analytical techniques, such as gas chromatography and high-performance liquid chromatography (HPLC), but these are not practical for the mass analyses of samples. To analyze mass samples rapidly, a colorimetric method was suggested. In this work, pigments and capsaicinoids were efficiently separated from chili pepper extract by sequential solid–liquid extraction and liquid–liquid extraction in test tubes followed by a colorimetric analysis on the capsaicinoids by a selective chromogenic reaction with Gibbs reagent (2,6-dichloroquinone-4-chloroimide). In the comparison of the capsaicinoid content by the colorimetric method and HPLC using acetone extracts of fresh pepper and dry red pepper as samples, R2 was 0.9973 and 0.9816, respectively, which shows a high linear correlation. In addition, a minimum of 1 μg/mL capsaicinoids can be detected and it was therefore determined that the method can efficiently analyze a great quantity of samples in a short time.
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Affiliation(s)
- Wang-Kyun Ryu
- Department of Medical Biotechnology, Kangwon National University, Chuncheon, Republic of Korea
| | - Hee-Woong Kim
- Department of Medical Biotechnology, Kangwon National University, Chuncheon, Republic of Korea
| | - Geun-Dong Kim
- Department of Medical Biotechnology, Kangwon National University, Chuncheon, Republic of Korea
| | - Hae-Ik Rhee
- Department of Medical Biotechnology, Kangwon National University, Chuncheon, Republic of Korea; Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon, Republic of Korea.
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Uchimiya M, Ni X, Wang ML. Structure-reactivity relationships between the fluorescent chromophores and antioxidant activity of grain and sweet sorghum seeds. Food Sci Nutr 2016; 4:811-817. [PMID: 27826430 PMCID: PMC5090644 DOI: 10.1002/fsn3.350] [Citation(s) in RCA: 4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 01/12/2016] [Accepted: 01/17/2016] [Indexed: 11/23/2022] Open
Abstract
Polyphenolic structures are the putative cause of a variety of seed functions including bird/insect resistance and antioxidant activity. Structure‐reactivity relationships are necessary to understand the influence of polyphenolic chromophore structures on the tannin content and free radical quenching ability determined by the traditional calorimetric methods. This study investigated the relationships between the structural attributes of fluorescent chromophore and the following seed characterization methods: procyanidin (by acid‐butanol assay) and flavonoid (by vanillin assay) contents, radical quenching (by DPPH assay), electron‐donating capacity (by FeIII reduction), and λmax (by UV/visible spectrophotometry). Distinctively different response was observed for different seed categories: U.S. grain sorghum hybrids, African grain sorghum, and sweet sorghum. The U.S. grain sorghum varieties (low‐tannin to maximize the livestock digestion) responded only to the DPPH assay. For sweet sorghum and African grain sorghum, linear correlation was observed between (1) the antioxidant activity (2) the amounts of procyanidins and flavonoids, and (2) the aromaticity of fingerprint fluorescent structures.
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Affiliation(s)
- Minori Uchimiya
- USDA-ARS Southern Regional Research Center 1100 Robert E. Lee Boulevard New Orleans Louisiana 70124
| | - Xinzhi Ni
- USDA-ARS Crop Genetics and Breeding Research Unit 2747 Davis Road Tifton Georgia 31793
| | - Ming Li Wang
- USDA-ARS Plant Genetic Resources Conservation Unit Griffin Georgia 30223
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Shi Q, Song Y, Zhu C, Yang H, Du D, Lin Y. Mesoporous Pt Nanotubes as a Novel Sensing Platform for Sensitive Detection of Intracellular Hydrogen Peroxide. ACS Appl Mater Interfaces 2015; 7:24288-95. [PMID: 26462543 DOI: 10.1021/acsami.5b08146] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Controlling the shape, structure, and surface morphology of nanomaterials is of great significance in optimizing sensitivity and catalytic performances in biosensing applications. The main goal of employing Pt-based nanomaterials is to increase their utilization efficiency due to their high cost. Herein, we report the synthesis of mesoporous Pt nanotubes using Pluronic P123 as soft templates and Ag nanowires with 50 nm in diameter as hard templates. The resultant materials with unique structures show high sensitivity and stability toward H2O2 detection with low cellular cytotoxicity. The high sensitivity and catalytic properties are attributed to the mesopores and hollow structures making the inner Pt surfaces accessible to reaction media and enlarging the total surface area and one-dimensional structure facilitating the mass diffusion rate.
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Affiliation(s)
| | | | | | | | - Dan Du
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education of the P.R. China, College of Chemistry, Central China Normal University , Wuhan 430079, China
| | - Yuehe Lin
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education of the P.R. China, College of Chemistry, Central China Normal University , Wuhan 430079, China
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Margraf T, Karnopp AR, Rosso ND, Granato D. Comparison between Folin-Ciocalteu and Prussian Blue Assays to Estimate The Total Phenolic Content of Juices and Teas Using 96-Well Microplates. J Food Sci 2015; 80:C2397-403. [PMID: 26448565 DOI: 10.1111/1750-3841.13077] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [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: 06/17/2015] [Accepted: 08/16/2015] [Indexed: 12/23/2022]
Abstract
UNLABELLED Folin-Ciocalteu colorimetric assay (FC) is the most widely used assay to estimate the total phenolic content in foods, beverages, herbs and other plant extracts, but many chemical compounds may act as interfering agents, producing inaccurate estimations of the real concentration of phenolic compounds in the matrix. Based on this limitation, the objective of this study was to compare, quantitatively, the Folin-Ciocalteu and Prussian Blue (PB) assays in estimating the total phenolic content in purple grape juices (n = 20; Vitis labrusca L.) and teas (n = 25) from different botanical origins using 96-well microplates. PB assay presented a low limit of detection (PB = 0.27 mg/L; FC = 0.25 mg/L) and quantification (PB = 0.92 mg/L; FC = 0.82 mg/L), showing its suitability in screening the total phenolic content in grape juices and teas. FC and PB assays presented a high association (P < 0.0001) for teas (r = 0.887) and grape juices (r = 0.923). The advantages of PB over FC assay are its simplicity, low time consumption (15 min reaction as compared to 60 min reaction for the FC assay), lower usage of reagents (solutions are prepared in a mM base), and higher selectivity. Additionally, PB assay was proven to be reproducible and repeatable and, therefore, may be used as an alternative to FC assay. PRACTICAL APPLICATION Prussian Blue assay (PB) has been used as an alternative to Folin-Ciocalteu assay (FC) to estimate the total content of phenolic compounds in herbs and some natural products. In our study we showed that the advantages of PB assay over FC are its simplicity, low time consumption (15 min reaction as compared to 60 min reaction for the FC assay), lower usage of reagents (solutions are prepared in a mM base) and higher selectivity as compared to FC assay. Additionally, PB assay was proven to be reproducible and repeatable and, therefore, may be used as an alternative to FC assay.
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Affiliation(s)
- Tiago Margraf
- Graduate Program in Food Science and Technology, State Univ. of Ponta Grossa, Av. Carlos Cavalcanti, 4748, CEP 84030-900, Ponta Grossa, PR, Brazil
| | - Ariadne Roberto Karnopp
- Graduate Program in Food Science and Technology, State Univ. of Ponta Grossa, Av. Carlos Cavalcanti, 4748, CEP 84030-900, Ponta Grossa, PR, Brazil
| | - Neiva Deliberali Rosso
- Graduate Program in Food Science and Technology, State Univ. of Ponta Grossa, Av. Carlos Cavalcanti, 4748, CEP 84030-900, Ponta Grossa, PR, Brazil
| | - Daniel Granato
- Graduate Program in Food Science and Technology, State Univ. of Ponta Grossa, Av. Carlos Cavalcanti, 4748, CEP 84030-900, Ponta Grossa, PR, Brazil
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Ling K, Jiang H, Zhang Q. A colorimetric method for the molecular weight determination of polyethylene glycol using gold nanoparticles. Nanoscale Res Lett 2013; 8:538. [PMID: 24359120 PMCID: PMC3878192 DOI: 10.1186/1556-276x-8-538] [Citation(s) in RCA: 25] [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] [Subscribe] [Scholar Register] [Received: 11/02/2013] [Accepted: 12/05/2013] [Indexed: 05/12/2023]
Abstract
A gold nanoparticle (AuNP)-based colorimetric method was developed for the molecular weight (MW) determination of polyethylene glycol (PEG), a commonly used hydrophilic polymer. Addition of a salt solution to PEG-coated AuNP solutions helps in screening the electrostatic repulsion between nanoparticles and generating a color change of the solutions from wine red to blue in 10 min in accordance with the MW of PEG, which illustrates the different stability degrees (SDs) of the AuNPs. The SDs are calculated by the absorbance ratios of the stable to the aggregated AuNPs in the solution. The root mean square end-to-end length (〈h2〉1/2) of PEG molecules shows a linear fit to the SDs of the PEG-coated AuNPs in a range of 1.938 ± 0.156 to 10.151 ± 0.176 nm. According to the Derjaguin-Landau-Verwey-Overbeek theory, the reason for this linear relationship is that the thickness of the PEG adlayer is roughly equivalent to the 〈h2〉1/2 of the PEG molecules in solution, which determines the SDs of the AuNPs. Subsequently, the MW of the PEG can be obtained from its 〈h2〉1/2 using a mathematical relationship between 〈h2〉1/2 and MW of PEG molecule. Applying this approach, we determined the 〈h2〉1/2 and the MW of four PEG samples according to their absorbance values from the ordinary ultraviolet-visible spectrophotometric measurements. Therefore, the MW of PEG can be distinguished straightforwardly by visual inspection and determined by spectrophotometry. This novel approach is simple, rapid, and sensitive.
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Affiliation(s)
- Kai Ling
- Key Laboratory of Biomedical Material of Tianjin, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300192, People’s Republic of China
| | - Hongyan Jiang
- Key Laboratory of Biomedical Material of Tianjin, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300192, People’s Republic of China
| | - Qiqing Zhang
- Key Laboratory of Biomedical Material of Tianjin, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300192, People’s Republic of China
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