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Gobbato R, Fornasaro S, Sergo V, Bonifacio A. Direct comparison of different protocols to obtain surface enhanced Raman spectra of human serum. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 317:124390. [PMID: 38749203 DOI: 10.1016/j.saa.2024.124390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 04/21/2024] [Accepted: 04/29/2024] [Indexed: 05/31/2024]
Abstract
Label-free Surface Enhanced Raman Spectroscopy (SERS) is a rapid technique that has been extensively applied in clinical diagnosis and biomedicine for the analysis of biofluids. The purpose of this approach relies on the ability to detect specific "metabolic fingerprints" of complex biological samples, but the full potential of this technique in diagnostics is yet to be exploited, mainly because of the lack of common analytical protocols for sample preparation and analysis. Variation of experimental parameters, such as substrate type, laser wavelength and sample processing can greatly influence spectral patterns, making results from different research groups difficult to compare. This study aims at making a step toward a standardization of the protocols in the analysis of human serum samples with Ag nanoparticles, by directly comparing the SERS spectra obtained from five different methods in which parameters like laser power, nanoparticle concentration, incubation/deproteinization steps and type of substrate used vary. Two protocols are the most used in the literature, and the other three are "in-house" protocols proposed by our group; all of them are employed to analyze the same human serum sample. The experimental results show that all protocols yield spectra that share the same overall spectral pattern, conveying the same biochemical information, but they significantly differ in terms of overall spectral intensity, repeatability, and preparation steps of the sample. A Principal Component Analysis (PCA) was performed revealing that protocol 3 and protocol 1 have the least variability in the dataset, while protocol 2 and 4 are the least repeatable.
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Affiliation(s)
- Roberto Gobbato
- Raman Spectroscopy Laboratory, Department of Engineering and Architecture, University of Trieste, Via Valerio 6a, 34127 Trieste, TS, Italy.
| | - Stefano Fornasaro
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via Licio Giorgieri 1, 34127 Trieste, TS, Italy.
| | - Valter Sergo
- Raman Spectroscopy Laboratory, Department of Engineering and Architecture, University of Trieste, Via Valerio 6a, 34127 Trieste, TS, Italy.
| | - Alois Bonifacio
- Raman Spectroscopy Laboratory, Department of Engineering and Architecture, University of Trieste, Via Valerio 6a, 34127 Trieste, TS, Italy.
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2
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Huang Q, Gong H, Wang G, Hu W, Wang W, Pan S, Xu J, Liu G, Tian Z. Positively Charged Silver and Gold Nanoparticles with Controllable Size Distribution for SERS Detection of Negatively Charged Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1305-1315. [PMID: 38164750 DOI: 10.1021/acs.langmuir.3c02846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Surface-enhanced Raman spectroscopy (SERS) has been demonstrated as an ultrasensitive tool for various molecules. However, for the negatively charged molecules, the widely used SERS substrate [negatively charged Ag and Au nanoparticles (Ag or Au NPs (-)] showed either low sensitivity or poor stability. The best solution is to synthesize positively charged silver or gold nanoparticles [Ag or Au NPs (+)] with high stability and excellent SERS performance, which are currently unavailable. To this end, we revitalized the strategy of "charge reversal and seed growth". By selection of ascorbic acid as the reductant and surfactant, the surface charge of Ag or Au NP (-) seeds is adjusted to a balanced state, where the surface charge is negative enough to satisfy the stabilization of the NPs (-) but does not hinder the subsequent charge reversal. By optimization of the chain length and electric charge of polyamine molecules, the highly stable and size-controllable uniform Ag NPs (+) and Au NPs (+) were seed-growth synthesized with high reproducibility. More importantly, the SERS performance of both Ag NPs (+) and Au NPs (+) achieved the trace detection of negatively charged molecules at the level of 1 μg/L, demonstrating an improved SERS sensitivity of up to 3 orders of magnitude compared to the previously reported sensitivity. Promisingly, the introduction of polyamine-capped Ag NPs (+) and Au NPs (+) as SERS substrates with high stability (1 year shelf life) will significantly broaden the application of SERS.
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Affiliation(s)
- Qiuting Huang
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Hongbo Gong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Guoqiang Wang
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Weiye Hu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Weili Wang
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Siqi Pan
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Jing Xu
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Guokun Liu
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Zhongqun Tian
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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3
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Berking BB, Mallen-Huertas L, Rijpkema SJ, Wilson DA. Porous Polymersomes as Carriers for Silver Nanoparticles and Nanoclusters: Advantages of Compartmentalization for Antimicrobial Usage. Biomacromolecules 2023; 24:5905-5914. [PMID: 37949646 PMCID: PMC10716846 DOI: 10.1021/acs.biomac.3c00925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 10/31/2023] [Accepted: 10/31/2023] [Indexed: 11/12/2023]
Abstract
The global threat to public health posed by antibiotic-resistant bacterial infections requires the exploration of innovative approaches. Nanomaterials, particularly silver nanoparticles (AgNPs) and nanoclusters (AgNCs), have emerged as potential solutions to address the pressing issue of a bacterial healthcare crisis. However, the high cytotoxicity levels and low stability associated with AgNPs and AgNCs limit their applicability. To overcome these challenges, AgNCs and AgNPs were synthesized in the presence of porous polymersomes, resulting in a compartmentalized system that enhances stability, reduces cytotoxicity, and maintains high antimicrobial activity. The encapsulated particles exhibit a distribution of silver components on both the surface and the core, which is confirmed through the analysis of surface charge and center of mass. Moreover, our investigation demonstrates improved stability of the nanoparticles and nanoclusters upon entrapment in the porous system, as evidenced by the ion release assay. The antimicrobial effectiveness of porous polymersomes containing AgNPs and AgNCs was demonstrated by visualizing the biofilms and quantifying the penetration depth. Furthermore, cytotoxicity studies showed that compartmentalization increases cell compatibility for AgNC-based systems, showcasing the many advantages this system holds.
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Affiliation(s)
| | | | - Sjoerd J. Rijpkema
- Systems Chemistry Department,
Institute for Molecules and Materials, Radboud
University, Nijmegen 6500 HC, The Netherlands
| | - Daniela A. Wilson
- Systems Chemistry Department,
Institute for Molecules and Materials, Radboud
University, Nijmegen 6500 HC, The Netherlands
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4
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Antal I, Strbak O, Zavisova V, Vojtova J, Kubovcikova M, Jurikova A, Khmara I, Girman V, Džunda R, Kovaľ K, Koneracka M. Development of Positively Charged Poly-L-Lysine Magnetic Nanoparticles as Potential MRI Contrast Agent. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1831. [PMID: 37368261 DOI: 10.3390/nano13121831] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/05/2023] [Accepted: 06/06/2023] [Indexed: 06/28/2023]
Abstract
A colloidal solution of magnetic nanoparticles (MNPs) modified with biocompatible positively charged poly-L-lysine (PLL) with an oleate (OL) layer employed as an initial coating was produced as a potential MRI contrast agent. The effect of various PLL/MNPs' mass ratios on the samples' hydrodynamic diameter, zeta potential, and isoelectric point (IEP) was studied by the dynamic light-scattering method. The optimal mass ratio for MNPs' surface coating was 0.5 (sample PLL0.5-OL-MNPs). The average hydrodynamic particle size in the sample of PLL0.5-OL-MNPs was 124.4 ± 1.4 nm, and in the PLL-unmodified nanoparticles, it was 60.9 ± 0.2 nm, indicating that the OL-MNPs' surface became covered by PLL. Next, the typical characteristics of the superparamagnetic behavior were observed in all samples. In addition, the decrease in saturation magnetizations from 66.9 Am2/kg for MNPs to 35.9 and 31.6 Am2/kg for sample OL-MNPs and PLL0.5-OL-MNPs also confirmed successful PLL adsorption. Moreover, we show that both OL-MNPs and PLL0.5-OL-MNPs exhibit excellent MRI relaxivity properties and a very high r2(*)/r1 ratio, which is very desirable in biomedical applications with required MRI contrast enhancement. The PLL coating itself appears to be the crucial factor in enhancing the relaxivity of MNPs in MRI relaxometry.
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Affiliation(s)
- Iryna Antal
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
| | - Oliver Strbak
- Biomedical Center Martin, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Mala Hora 4, 03601 Martin, Slovakia
| | - Vlasta Zavisova
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
| | - Jana Vojtova
- Biomedical Center Martin, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Mala Hora 4, 03601 Martin, Slovakia
| | - Martina Kubovcikova
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
| | - Alena Jurikova
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
| | - Iryna Khmara
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
| | - Vladimir Girman
- Institute of Physics, Faculty of Sciences, Pavol Jozef Safarik University in Kosice, Park Angelinum 9, 04154 Kosice, Slovakia
| | - Róbert Džunda
- Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
| | - Karol Kovaľ
- Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
| | - Martina Koneracka
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
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Choudhary M, Bisht B, Saini JK, Bharti, Singh P, Bhardwaj P, Dilawari R, Pinnaka AK, Ray P, Gupta M, Sethi S, Suri CR, Raje M, Bhalla V. Bifunctionalized nanobioprobe based rapid color-shift assay for typhoid targeting Vi capsular polysaccharide. Biosens Bioelectron 2023; 228:115195. [PMID: 36931192 DOI: 10.1016/j.bios.2023.115195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 02/27/2023] [Accepted: 03/03/2023] [Indexed: 03/09/2023]
Abstract
Typhoid fever is an acute illness caused by Salmonella Typhi and the current diagnostic gap leads to inaccurate, over-diagnosis of typhoid leading to excessive use of antibiotics. Herein, to address the challenges we describe a new rapid color-shift assay based on a novel bifunctional nanobioprobe (Vi-AgNP probe) that is functionalized with specific biomarker Vi polysaccharide and also has the co-presence of Ag as urease inhibitor. The immunoreactions between the Vi with specific antibodies (Abs) present in typhoid patient sample forms a shielding barrier over Vi-AgNP probe rendering the urease to be active, generating colored output. Vi polysaccharide coating on the AgNP was visualized using HRTEM. TEM was performed to get insight into shielding barrier formation by the Abs. MST (microscale thermophoresis) data showed less binding Kd of 7.43 μM in presence of Abs whereas probe with urease showed efficient binding with Kd 437 nM. The assay was validated using 53 human sera samples and proven effective with 100% sensitivity. The assay showed relative standard deviation (RSD) of 4.3% estimated using rabbit anti-Vi Abs. The entire procedure could be completed within 15 min. Unlike lateral flow based assays, our assay does not require multiple combination of Abs for detection. The assay format was also found compatible in paper strip test that provides promising opportunities to develop low-cost on-spot assay for clinical diagnostics.
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Affiliation(s)
- Megha Choudhary
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India
| | - Bhawana Bisht
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Jai Kumar Saini
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India
| | - Bharti
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India
| | - Pargat Singh
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India
| | - Priya Bhardwaj
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Rahul Dilawari
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India
| | - Anil Kumar Pinnaka
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India
| | - Pallab Ray
- Department of Medical Microbiology, Post Graduate Institute of Medical Education and Research (PGIMER), Sector 12, Chandigarh, 160012, India
| | - Madhu Gupta
- Department of Community Medicine, PGIMER, India
| | - Sunil Sethi
- Department of Medical Microbiology, Post Graduate Institute of Medical Education and Research (PGIMER), Sector 12, Chandigarh, 160012, India
| | - C Raman Suri
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India
| | - Manoj Raje
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India
| | - Vijayender Bhalla
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh, 160036, India.
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6
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Kitaw SL, Birhan YS, Tsai HC. Plasmonic surface-enhanced Raman scattering nano-substrates for detection of anionic environmental contaminants: Current progress and future perspectives. ENVIRONMENTAL RESEARCH 2023; 221:115247. [PMID: 36640935 DOI: 10.1016/j.envres.2023.115247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/26/2022] [Accepted: 01/06/2023] [Indexed: 06/17/2023]
Abstract
Surface-enhanced Raman scattering spectroscopy (SERS) is a powerful technique of vibrational spectroscopy based on the inelastic scattering of incident photons by molecular species. It has unique properties such as ultra-sensitivity, selectivity, non-destructivity, speed, and fingerprinting properties for analytical and sensing applications. This enables SERS to be widely used in real-world sample analysis and basic plasmonic mechanistic studies. However, the desirable properties of SERS are compromised by the high cost and low reproducibility of the signals. The development of multifunctional, stable and reusable nano-engineered SERS substrates is a viable solution to circumvent these drawbacks. Recently, plasmonic SERS active nano-substrates with various morphologies have attracted the attention of researchers due to promising properties such as the formation of dense hot spots, additional stability, tunable and controlled morphology, and surface functionalization. This comprehensive review focused on the current advances in the field of SERS active nanosubstrates suitable for the detection and quantification of anionic environmental pollutants. The common fabrication methods, including the techniques for morphological adjustments and surface modification, substrate categories, and the design of nanotechnologically fabricated plasmonic SERS substrates for anion detection are systematically presented. Here, the need for the design, synthesis, and functionalization of SERS nano-substrates for anions of great environmental importance is explained in detail. In addition, the broad categories of SERS nano-substrates, namely colloid-based SERS substrates and solid-support SERS substrates are discussed. Moreover, a brief discussion of SERS detection of certain anionic pollutants in the environment is presented. Finally, the prospects in the fabrication and commercialization of pilot-scale handheld SERS sensors and the construction of smart nanosubstrates integrated with novel amplifying materials for the detection of anions of environmental and health concern are proposed.
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Affiliation(s)
- Sintayehu Leshe Kitaw
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, 106, Taiwan, ROC
| | - Yihenew Simegniew Birhan
- Department of Chemistry, College of Natural and Computational Sciences, Debre Markos University, P.O. Box 269, Debre Markos, Ethiopia
| | - Hsieh-Chih Tsai
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, 106, Taiwan, ROC; Advanced Membrane Materials Center, National Taiwan University of Science and Technology, Taipei, 106, Taiwan, ROC; R&D Center for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan, 320, Taiwan, ROC.
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7
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Zhong W, Wang X, Yang L, Wang Y, Xiao Q, Yu S, Cannon RD, Bai Y, Zhang C, Chen D, Ji P, Gao X, Song J. Nanocarrier-Assisted Delivery of Metformin Boosts Remodeling of Diabetic Periodontal Tissue via Cellular Exocytosis-Mediated Regulation of Endoplasmic Reticulum Homeostasis. ACS NANO 2022; 16:19096-19113. [PMID: 36259964 DOI: 10.1021/acsnano.2c08146] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Endoplasmic reticulum (ER) dysfunction is a potential contributor to the impaired repair capacity of periodontal tissue in diabetes mellitus (DM) patients. Restoring ER homeostasis is thus critical for successful regenerative therapy of diabetic periodontal tissue. Recent studies have shown that metformin can modulate DM-induced ER dysfunction, yet its mechanism remains unclear. Herein, we show that high glucose elevates the intracellular miR-129-3p level due to exocytosis-mediated release failure and subsequently perturbs ER calcium homeostasis via downregulating transmembrane and coiled-coil domain 1 (TMCO1), an ER Ca2+ leak channel, in periodontal ligament stem cells (PDLSCs). This results in the degradation of RUNX2 via the ubiquitination-dependent pathway, in turn leading to impaired PDLSCs osteogenesis. Interestingly, metformin could upregulate P2X7R-mediated exosome release and decrease intracellular miR-129-3p accumulation, which restores ER homeostasis and thereby rescues the impaired PDLSCs. To further demonstrate the in vivo effect of metformin, a nanocarrier for sustained local delivery of metformin (Met@HALL) in periodontal tissue is developed. Our results demonstrate that compared to controls, Met@HALL with enhanced cytocompatibility and pro-osteogenic activity could boost the remodeling of diabetic periodontal tissue in rats. Collectively, our findings unravel a mechanism of metformin in restoring cellular ER homeostasis, enabling the development of a nanocarrier-mediated ER targeting strategy for remodeling diabetic periodontal tissue.
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Affiliation(s)
- Wenjie Zhong
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Xinyan Wang
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Lanxin Yang
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Yue Wang
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Qingyue Xiao
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Simin Yu
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Richard D Cannon
- Department of Oral Sciences, Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin 9016, New Zealand
| | - Yan Bai
- Chongqing Research Center for Pharmaceutical Engineering, Chongqing Key Laboratory of Biochemistry and Molecular Pharmacology, College of Pharmacy, Chongqing Medical University, Chongqing 400016, China
| | - Chuangwei Zhang
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Duanjing Chen
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Ping Ji
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Xiang Gao
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Jinlin Song
- College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
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8
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Markina NE, Goryacheva IY, Markin AV. Surface-Enhanced Raman Spectroscopy for the Determination of Medical and Narcotic Drugs in Human Biofluids. JOURNAL OF ANALYTICAL CHEMISTRY 2022. [DOI: 10.1134/s106193482208007x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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9
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Kato R, Uesugi M, Komatsu Y, Okamoto F, Tanaka T, Kitawaki F, Yano TA. Highly Stable Polymer Coating on Silver Nanoparticles for Efficient Plasmonic Enhancement of Fluorescence. ACS OMEGA 2022; 7:4286-4292. [PMID: 35155921 PMCID: PMC8829869 DOI: 10.1021/acsomega.1c06010] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 12/28/2021] [Indexed: 05/05/2023]
Abstract
Surface coating of plasmonic nanoparticles is of huge importance to suppress fluorescence quenching in plasmon-enhanced fluorescence sensing. Herein, a one-pot method for synthesizing polymer-coated silver nanoparticles was developed using a functional polymer conjugated with disulfide-containing anchoring groups. The disulfides played a crucial role in covalently bonding polymers to the surface of the silver nanoparticles. The covalent bond enabled the polymer layer to form a long-term stable coating on the silver nanoparticles. The polymer layer coated was adequately thin to efficiently achieve plasmonic enhancement of fluorescence and also thick enough to effectively suppress quenching of fluorescence, achieving a huge net enhancement of fluorescence. The polymer-coated plasmonic nanoparticles are a promising platform for demonstrating highly sensitive biosensing for medical diagnostics.
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Affiliation(s)
- Ryo Kato
- Institute
of Post-LED Photonics, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
| | | | - Yoshie Komatsu
- PHC
Corporation, 2131-1 Minamigata, Toon, Ehime 791-0395, Japan
| | | | - Takuo Tanaka
- Institute
of Post-LED Photonics, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
| | | | - Taka-aki Yano
- Institute
of Post-LED Photonics, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
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10
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Turino M, Pazos-Perez N, Guerrini L, Alvarez-Puebla RA. Positively-charged plasmonic nanostructures for SERS sensing applications. RSC Adv 2021; 12:845-859. [PMID: 35425123 PMCID: PMC8978927 DOI: 10.1039/d1ra07959j] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 12/17/2021] [Indexed: 12/15/2022] Open
Abstract
Surface-enhanced Raman (SERS) spectroscopy has been establishing itself as an ultrasensitive analytical technique with a cross-disciplinary range of applications, which scientific growth is triggered by the continuous improvement in the design of advanced plasmonic materials with enhanced multifunctional abilities and tailorable surface chemistry. In this regard, conventional synthetic procedures yield negatively-charged plasmonic materials which can hamper the adhesion of negatively-charged species. To tackle this issue, metallic surfaces have been modified via diverse procedures with a broad array of surface ligands to impart positive charges. Cationic amines have been preferred because of their ability to retain a positive zeta potential even at alkaline pH as well as due to their wide accessibility in terms of structural features and cost. In this review, we will describe and discuss the different approaches for generating positively-charged plasmonic platforms and their applications in SERS sensing. Integration of ligands equipped with quaternary amines on plasmonic surfaces generates positively-charged nanomaterials suitable for electrostatically binding negatively-charged species paving the way for their application in SERS sensing.![]()
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Affiliation(s)
- Mariacristina Turino
- Department of Physical and Inorganic Chemistry - EMaS, Universitat Rovira I Virgili Carrer de Marcel·lí Domingo s/n 43007 Tarragona Spain
| | - Nicolas Pazos-Perez
- Department of Physical and Inorganic Chemistry - EMaS, Universitat Rovira I Virgili Carrer de Marcel·lí Domingo s/n 43007 Tarragona Spain
| | - Luca Guerrini
- Department of Physical and Inorganic Chemistry - EMaS, Universitat Rovira I Virgili Carrer de Marcel·lí Domingo s/n 43007 Tarragona Spain
| | - Ramon A Alvarez-Puebla
- Department of Physical and Inorganic Chemistry - EMaS, Universitat Rovira I Virgili Carrer de Marcel·lí Domingo s/n 43007 Tarragona Spain .,ICREA Passeig Lluís Companys 23 08010 Barcelona Spain
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11
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Birtekocak F, Demirbolat GM, Cevik O. TRAIL Conjugated Silver Nanoparticle Synthesis, Characterization and Therapeutic Effects on HT-29 Colon Cancer Cells. IRANIAN JOURNAL OF PHARMACEUTICAL RESEARCH : IJPR 2021; 20:45-56. [PMID: 34567145 PMCID: PMC8457744 DOI: 10.22037/ijpr.2020.112069.13514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Colon cancer is one of the most prominent causes of cancer-related morbidity and mortality and curable if detected in the early stages. TNF-related apoptosis-inducing ligand (TRAIL) is a therapeutic protein and has a potential anti-cancer activity that is widely used for the treatment of several cancers. In this study, we aimed to develop a silver nanoparticle system conjugated with TRAIL and coated with PEG (AgCTP NPs) to improve the therapeutic effects of colon cancer. AgCTP NPs were characterized by UV spectrum, FTIR and zetasizer. Cytotoxicity, hemolysis assay and apoptotic effects of nanoparticles were investigated using a colon cancer cell line (HT-29) in-vitro. Treatment with AgCTP NPs effectively inhibited proliferation and colony formation of HT-29 cells. The apoptotic effects of nanoparticles on HT-29 cells were determined as Bax, Bcl-2, PARP and clv-PARP protein expression levels using Western blot. Apoptotic proteins were upregulated by AgCTP NPs. In this study, we demonstrated that AgCTP NPs had an anti-cancer effect by activating cell death. Thus, we have confirmed that silver nanoparticles can be selected as a good carrier for TRAIL therapeutic proteins that can be used to treat colon cancer.
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Affiliation(s)
- Fatih Birtekocak
- Department of Biochemistry, School of Medicine, Aydin Adnan Menderes University, Aydin, Turkey
| | - Gulen Melike Demirbolat
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Biruni University, Istanbul, Turkey
| | - Ozge Cevik
- Department of Biochemistry, School of Medicine, Aydin Adnan Menderes University, Aydin, Turkey
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12
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Kruchinin NY. Molecular Dynamics Simulation of Uniformly Charged Polypeptides on the Surface of a Charged Metal Nanoparticle in an Alternating Electric Field. COLLOID JOURNAL 2021. [DOI: 10.1134/s1061933x2102006x] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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13
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Damberga D, Fedorenko V, Grundšteins K, Altundal Ş, Šutka A, Ramanavičius A, Coy E, Mrówczyński R, Iatsunskyi I, Viter R. Influence of PDA Coating on the Structural, Optical and Surface Properties of ZnO Nanostructures. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E2438. [PMID: 33291264 PMCID: PMC7762110 DOI: 10.3390/nano10122438] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 11/30/2020] [Accepted: 12/02/2020] [Indexed: 12/14/2022]
Abstract
Polydopamine (PDA) is a new biocompatible material, which has prospects in biomedical and sensor applications. Due to functional groups, it can host wide range of biomolecules. ZnO nanostructures are well known templates for optical sensors and biosensors. The combination of ZnO and PDA results in a change of optical properties of ZnO-PDA composites as a shift of photoluminescence (PL) peaks and PL quenching. However, to date, the effect of the PDA layer on fundamental properties of ZnO-PDA nanostructures has not been studied. The presented paper reports on optical and surface properties of novel ZnO-PDA nanocomposites. PDA layers were chemically synthesized on ZnO nanostructures from different solution concentrations of 0.3, 0.4, 0.5 and 0.7 mg/mL. Structure, electronic and optical properties were studied by SEM, Raman, FTIR, diffuse reflectance and photoluminescence methods. The Z-potential of the samples was evaluated in neutral pH (pH = 7.2). The response of the samples towards poly-l-lysine adsorption, as a model molecule, was studied by PL spectroscopy to evaluate the correlation between optical and surface properties. The role of the PDA concentration on fundamental properties was discussed.
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Affiliation(s)
- Daina Damberga
- Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas 3, LV-1004 Riga, Latvia; (D.D.); (V.F.); (K.G.); (Ş.A.); (A.Š.); (A.R.)
| | - Viktoriia Fedorenko
- Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas 3, LV-1004 Riga, Latvia; (D.D.); (V.F.); (K.G.); (Ş.A.); (A.Š.); (A.R.)
| | - Kārlis Grundšteins
- Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas 3, LV-1004 Riga, Latvia; (D.D.); (V.F.); (K.G.); (Ş.A.); (A.Š.); (A.R.)
| | - Şahin Altundal
- Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas 3, LV-1004 Riga, Latvia; (D.D.); (V.F.); (K.G.); (Ş.A.); (A.Š.); (A.R.)
| | - Andris Šutka
- Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas 3, LV-1004 Riga, Latvia; (D.D.); (V.F.); (K.G.); (Ş.A.); (A.Š.); (A.R.)
- Research Laboratory of Functional Materials Technologies, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena 3/7, LV-1048 Riga, Latvia
| | - Arunas Ramanavičius
- Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas 3, LV-1004 Riga, Latvia; (D.D.); (V.F.); (K.G.); (Ş.A.); (A.Š.); (A.R.)
- Laboratory of Nanotechnology, State Research Institute Center for Physical Sciences and Technology, Sauletekio ave.3, LT-10257 Vilnius, Lithuania
| | - Emerson Coy
- NanoBioMedical Centre, Adam Mickiewicz University in Poznan, Wszechnicy Piastowskiej 3, 61-614 Poznan, Poland; (E.C.); (R.M.)
| | - Radosław Mrówczyński
- NanoBioMedical Centre, Adam Mickiewicz University in Poznan, Wszechnicy Piastowskiej 3, 61-614 Poznan, Poland; (E.C.); (R.M.)
| | - Igor Iatsunskyi
- NanoBioMedical Centre, Adam Mickiewicz University in Poznan, Wszechnicy Piastowskiej 3, 61-614 Poznan, Poland; (E.C.); (R.M.)
| | - Roman Viter
- Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas 3, LV-1004 Riga, Latvia; (D.D.); (V.F.); (K.G.); (Ş.A.); (A.Š.); (A.R.)
- Center for Collective Use of Scientific Equipment, Sumy State University, 31, Sanatornaya st., 40018 Sumy, Ukraine
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14
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Trac N, Chen LY, Zhang A, Liao CP, Poon C, Wang J, Ando Y, Joo J, Garri C, Shen K, Kani K, Gross ME, Chung EJ. CCR2-targeted micelles for anti-cancer peptide delivery and immune stimulation. J Control Release 2020; 329:614-623. [PMID: 33011241 DOI: 10.1016/j.jconrel.2020.09.054] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 09/18/2020] [Accepted: 09/29/2020] [Indexed: 02/06/2023]
Abstract
Signaling between the CC chemokine receptor 2 (CCR2) with its ligand, monocyte chemoattractant protein-1 (MCP-1) promotes cancer progression by directly stimulating tumor cell proliferation and downregulating the expression of apoptotic proteins. Additionally, the MCP-1/CCR2 signaling axis drives the migration of circulating monocytes into the tumor microenvironment, where they mature into tumor-associated macrophages (TAMs) that promote disease progression through induction of angiogenesis, tissue remodeling, and suppression of the cytotoxic T lymphocyte (CTL) response. In order to simultaneously disrupt MCP-1/CCR2 signaling and target CCR2-expressing cancer cells for drug delivery, KLAK-MCP-1 micelles consisting of a CCR2-targeting peptide sequence (MCP-1 peptide) and the apoptotic KLAKLAK peptide were synthesized. In vitro, KLAK-MCP-1 micelles were observed to bind and induce cytotoxicity to cancer cells through interaction with CCR2. In vivo, KLAK-MCP-1 micelles inhibited tumor growth (34 ± 11%) in a subcutaneous B16F10 murine melanoma model despite minimal tumor accumulation upon intravenous injection. Tumors treated with KLAK-MCP1 demonstrated reduced intratumor CCR2 expression and altered infiltration of TAMs and CTLs as evidenced by immunohistochemical and flow cytometric analysis. These studies highlight the potential application of CCR2-targeted nanotherapeutic micelles in cancer treatment.
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Affiliation(s)
- Noah Trac
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, United States
| | - Leng-Ying Chen
- Lawrence J. Ellison Institute for Transformative Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, United States
| | - Ailin Zhang
- Lawrence J. Ellison Institute for Transformative Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, United States
| | - Chun-Peng Liao
- Lawrence J. Ellison Institute for Transformative Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, United States
| | - Christopher Poon
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, United States
| | - Jonathan Wang
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, United States
| | - Yuta Ando
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, United States
| | - Johan Joo
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, United States
| | - Carolina Garri
- Lawrence J. Ellison Institute for Transformative Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, United States
| | - Keyue Shen
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, United States; Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, United States
| | - Kian Kani
- Lawrence J. Ellison Institute for Transformative Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, United States; Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, United States
| | - Mitchell E Gross
- Lawrence J. Ellison Institute for Transformative Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, United States; Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, United States
| | - Eun Ji Chung
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, United States; Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, United States; Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, United States; Division of Nephrology and Hypertension, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, United States; Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, United States; Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, United States.
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15
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Determination of methotrexate in spiked human urine using SERS-active sorbent. Anal Bioanal Chem 2020; 412:7757-7766. [DOI: 10.1007/s00216-020-02932-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 08/15/2020] [Accepted: 08/31/2020] [Indexed: 12/14/2022]
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16
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Jiang Q, Luo B, Wu Z, Wang X. Antibacterial composite paper with corn stalk-based carbon spheres immobilized AgNPs. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 113:111012. [DOI: 10.1016/j.msec.2020.111012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 04/12/2020] [Accepted: 04/22/2020] [Indexed: 12/17/2022]
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17
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Paris JL, Coelho F, Teixeira A, Diéguez L, Silva BFB, Abalde-Cela S. In Vitro Evaluation of Lipopolyplexes for Gene Transfection: Comparing 2D, 3D and Microdroplet-Enabled Cell Culture. Molecules 2020; 25:molecules25143277. [PMID: 32708478 PMCID: PMC7397275 DOI: 10.3390/molecules25143277] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 07/06/2020] [Accepted: 07/14/2020] [Indexed: 01/11/2023] Open
Abstract
Complexes combining nucleic acids with lipids and polymers (lipopolyplexes) show great promise for gene therapy since they enable compositional, physical and functional versatility to be optimized for therapeutic efficiency. When developing lipopolyplexes for gene delivery, one of the first evaluations performed is an in vitro transfection efficiency experiment. Many different in vitro models can be used, and the effect of the model on the experiment outcome has not been thoroughly studied. The objective of this work was to compare the insights obtained from three different in vitro models, as well as the potential limitations associated with each of them. We have prepared a series of lipopolyplex formulations with three different cationic polymers (poly-l-lysine, bioreducible poly-l-lysine and polyethyleneimine), and assessed their in vitro biological performance in 2D monolayer cell culture, 3D spheroid culture and microdroplet-based single-cell culture. Lipopolyplexes from different polymers presented varying degrees of transfection efficiency in all models. The best-performing formulation in 2D culture was the polyethyleneimine lipopolyplex, while lipoplexes prepared with bioreducible poly-l-lysine were the only ones achieving any transfection in microdroplet-enabled cell culture. None of the prepared formulations achieved significant gene transfection in 3D culture. All of the prepared formulations were well tolerated by cells in 2D culture, while at least one formulation (poly-l-lysine polyplex) delayed 3D spheroid growth. These results highlight the need for selecting the appropriate in vitro model depending on the intended application.
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18
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Cao C, Cheng S, Cao C. Observation of the complex spectra for the supramolecular system involving silver nanoparticles‐biaryl Schiff bases containing the nitro group. J PHYS ORG CHEM 2020. [DOI: 10.1002/poc.4059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Chao‐Tun Cao
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Hunan Provincial University Key Laboratory of QSAR/QSPR, School of Chemistry and Chemical EngineeringHunan University of Science and Technology Xiangtan China
| | - Shi‐Mao Cheng
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Hunan Provincial University Key Laboratory of QSAR/QSPR, School of Chemistry and Chemical EngineeringHunan University of Science and Technology Xiangtan China
| | - Chenzhong Cao
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Hunan Provincial University Key Laboratory of QSAR/QSPR, School of Chemistry and Chemical EngineeringHunan University of Science and Technology Xiangtan China
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19
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Huang Y, Wang X, Lai K, Fan Y, Rasco BA. Trace analysis of organic compounds in foods with surface‐enhanced Raman spectroscopy: Methodology, progress, and challenges. Compr Rev Food Sci Food Saf 2020; 19:622-642. [DOI: 10.1111/1541-4337.12531] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 11/22/2019] [Accepted: 12/12/2019] [Indexed: 01/17/2023]
Affiliation(s)
- Yiqun Huang
- School of Chemistry and Food EngineeringChangsha University of Science and Technology Changsha Hunan China
| | - Xiaohui Wang
- College of Food Science and TechnologyShanghai Ocean University Shanghai China
| | - Keqiang Lai
- College of Food Science and TechnologyShanghai Ocean University Shanghai China
| | - Yuxia Fan
- Department of Food Science and Technology, School of Agricultural and BiologyShanghai Jiao Tong University Shanghai China
| | - Barbara A. Rasco
- College of Agriculture and Natural ResourcesUniversity of Wyoming Laramie Wyoming
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20
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Majeed SA. Combining microextraction methods with surface-enhanced Raman spectroscopy towards more selective and sensitive analyte detection by plasmonic metal nanoparticles. Analyst 2020; 145:6744-6752. [DOI: 10.1039/d0an01304h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Raman signals of analytes can be enhanced on the surface of noble nanoparticles by generating SERS signals, which can be further enhanced using microextraction (ME) techniques.
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21
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Banchelli M, Cascella R, D'Andrea C, Cabaj L, Osticioli I, Ciofini D, Li MS, Skupień K, de Angelis M, Siano S, Cecchi C, Pini R, La Penna G, Chiti F, Matteini P. Nanoscopic insights into the surface conformation of neurotoxic amyloid β oligomers. RSC Adv 2020; 10:21907-21913. [PMID: 35516647 PMCID: PMC9054531 DOI: 10.1039/d0ra03799k] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 06/01/2020] [Indexed: 11/21/2022] Open
Abstract
Raman spectroscopy assisted by localized plasmon resonances generating effective hot spots at the gaps between intertwined silver nanowires is herein adopted to unravel characteristic molecular motifs on the surface of Aβ42 misfolded oligomers that are critical in driving intermolecular interactions in neurodegeneration. Unraveling characteristic structural determinants at the basis of Aβ42 oligomers' neurotoxicity by a sub-molecular SERS investigation of their surface.![]()
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22
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Iancu SD, Stefancu A, Moisoiu V, Leopold LF, Leopold N. The role of Ag +, Ca 2+, Pb 2+ and Al 3+ adions in the SERS turn-on effect of anionic analytes. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2019; 10:2338-2345. [PMID: 31886110 PMCID: PMC6902780 DOI: 10.3762/bjnano.10.224] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Accepted: 11/04/2019] [Indexed: 06/10/2023]
Abstract
In our recent studies we highlighted the role of adsorbed ions (adions) in turning on the surface-enhanced Raman scattering (SERS) effect in a specific mode for anionic and cationic analytes. In this work, we emphasize the role of Ag+, Ca2+, Pb2+ and Al3+ adions in the specific adsorption of anionic analytes such as the citrate capping agent and three organic acids. Our results suggest an adion-specific adsorption mechanism: the adsorption of anionic analytes is facilitated by positively charged adions such as Ag+, Ca2+, Pb2+ or Al3+, which provide adsorption sites specific for the anionic analytes. The turn-on of the SERS effect is explained in the context of the chemical mechanism of SERS. The adions form SERS-active sites on the silver surface enabling a charge transfer between the adsorbate and the silver surface. High-intensity SERS spectra of uric acid, salicylic acid and fumaric acid could be recorded at a concentration of 50 µM only after activation of the colloidal silver nanoparticles by Ca2+, Pb2+ or Al3+ (50 µM). The chemisorption of the three anionic species to the silver surface occurs competitively and is enhanced with the anions of higher affinities to the silver surface as indicated by the SERS spectra of corresponding mixed solutions.
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Affiliation(s)
- Stefania D Iancu
- Faculty of Physics, Babeș-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania
- Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine, Manastur 3-5, 400372 Cluj-Napoca, Romania
| | - Andrei Stefancu
- Faculty of Physics, Babeș-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania
- Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine, Manastur 3-5, 400372 Cluj-Napoca, Romania
| | - Vlad Moisoiu
- Faculty of Physics, Babeș-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania
| | - Loredana F Leopold
- Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine, Manastur 3-5, 400372 Cluj-Napoca, Romania
| | - Nicolae Leopold
- Faculty of Physics, Babeș-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania
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23
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Cao C, Liu J, Cao C. Investigation on the UV spectra of the supermolecular system involving silver nanoparticles–substituted
N
‐(phenyl‐ethylene)‐anilines. J PHYS ORG CHEM 2019. [DOI: 10.1002/poc.3993] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Chao‐Tun Cao
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Key Laboratory of QSAR/QSPR of Hunan Provincial University, School of Chemistry and Chemical EngineeringHunan University of Science and Technology Xiangtan China
| | - Junlan Liu
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Key Laboratory of QSAR/QSPR of Hunan Provincial University, School of Chemistry and Chemical EngineeringHunan University of Science and Technology Xiangtan China
| | - Chenzhong Cao
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Key Laboratory of QSAR/QSPR of Hunan Provincial University, School of Chemistry and Chemical EngineeringHunan University of Science and Technology Xiangtan China
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24
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Busch R, Karim F, Weis J, Sun Y, Zhao C, Vasquez ES. Optimization and Structural Stability of Gold Nanoparticle-Antibody Bioconjugates. ACS OMEGA 2019; 4:15269-15279. [PMID: 31552374 PMCID: PMC6751724 DOI: 10.1021/acsomega.9b02276] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 08/21/2019] [Indexed: 05/07/2023]
Abstract
Gold nanoparticles (AuNPs) bound with biomolecules have emerged as suitable biosensors exploiting unique surface chemistries and optical properties. Many efforts have focused on antibody bioconjugation to AuNPs resulting in a sensitive bioconjugate to detect specific types of bacteria. Unfortunately, bacteria thrive under various harsh environments, and an understanding of bioconjugate stability is needed. Here, we show a method for optimizing Listeria monocytogenes polyclonal antibodies bioconjugation mechanisms to AuNPs via covalent binding at different pH values, from 2 to 11, and 2-(N-morpholino)ethanesulfonic acid (MES), 3-(N-morpholino)propanesulfonic acid, NaOH, HCl conditions. By fitting Lorentz curves to the amide I and II regions, we analyze the stability of the antibody secondary structure. This shows an increase in the apparent breakdown of the antibody secondary structure during bioconjugation as pH decreases from 7.9 to 2. We find variable adsorption efficiency, measured as the percentage of antibody adsorbed to the AuNP surface, from 17 to 27% as pH increases from 2 to 6 before decreasing to 8 and 13% at pH 7.9 and 11, respectively. Transmission electron microscopy (TEM) analysis reveals discrepancies between size and morphological changes due to the corona layer assembly from antibody binding to single nanoparticles versus aggregation or cluster self-assembly into large aggregates. The corona layer formation size increases from 3.9 to 5.1 nm from pH 2 to 6, at pH 7.9, there is incomplete corona formation, whereas at pH 11, there is a corona layer formed of 6.4 nm. These results indicate that the covalent binding process was more efficient at lower pH values; however, aggregation and deactivation of the antibodies were observed. We demonstrate that optimum bioconjugation condition was determined at pH 6 and MES buffer-type by indicators of covalent bonding and stability of the antibody secondary structure using Fourier transform-infrared, the morphological characteristics and corona layer formation using TEM, and low wavelength shifts of ultraviolet-visible after bioconjugation.
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Affiliation(s)
- Robert
T. Busch
- Department
of Chemical and Materials Engineering, Department of Electro-Optics and
Photonics, Department of Biology, Integrative Science and Engineering Center, and Department of
Physics, University of Dayton, 300 College Park, Dayton, Ohio 45469, United States
| | - Farzia Karim
- Department
of Chemical and Materials Engineering, Department of Electro-Optics and
Photonics, Department of Biology, Integrative Science and Engineering Center, and Department of
Physics, University of Dayton, 300 College Park, Dayton, Ohio 45469, United States
| | - John Weis
- Department
of Chemical and Materials Engineering, Department of Electro-Optics and
Photonics, Department of Biology, Integrative Science and Engineering Center, and Department of
Physics, University of Dayton, 300 College Park, Dayton, Ohio 45469, United States
| | - Yvonne Sun
- Department
of Chemical and Materials Engineering, Department of Electro-Optics and
Photonics, Department of Biology, Integrative Science and Engineering Center, and Department of
Physics, University of Dayton, 300 College Park, Dayton, Ohio 45469, United States
| | - Chenglong Zhao
- Department
of Chemical and Materials Engineering, Department of Electro-Optics and
Photonics, Department of Biology, Integrative Science and Engineering Center, and Department of
Physics, University of Dayton, 300 College Park, Dayton, Ohio 45469, United States
| | - Erick S. Vasquez
- Department
of Chemical and Materials Engineering, Department of Electro-Optics and
Photonics, Department of Biology, Integrative Science and Engineering Center, and Department of
Physics, University of Dayton, 300 College Park, Dayton, Ohio 45469, United States
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25
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Markina NE, Markin AV. Application of Aluminum Hydroxide for Improvement of Label-Free SERS Detection of Some Cephalosporin Antibiotics in Urine. BIOSENSORS-BASEL 2019; 9:bios9030091. [PMID: 31340480 PMCID: PMC6784367 DOI: 10.3390/bios9030091] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 07/17/2019] [Accepted: 07/22/2019] [Indexed: 12/22/2022]
Abstract
This report is dedicated to development of surface-enhanced Raman spectroscopy (SERS) based analysis protocol for detection of antibiotics in urine. The key step of the protocol is the pretreatment of urine before the detection to minimize background signal. The pretreatment includes extraction of intrinsic urine components using aluminum hydroxide gel (AHG) and further pH adjusting of the purified sample. The protocol was tested by detection of a single antibiotic in artificially spiked samples of real urine. Five antibiotics of cephalosporin class (cefazolin, cefoperazone, cefotaxime, ceftriaxone, and cefuroxime) were used for testing. SERS measurements were performed using a portable Raman spectrometer with 638 nm excitation wavelength and silver nanoparticles as SERS substrate. The calibration curves of four antibiotics (cefuroxime is the exception) cover the concentrations required for detection in patient’s urine during therapy (25/100‒500 μg/mL). Random error of the analysis (RSD < 20%) and limits of quantification (20‒90 μg/mL) for these antibiotics demonstrate the applicability of the protocol for reliable quantitative detection during therapeutic drug monitoring. The detection of cefuroxime using the protocol is not sensitive enough, allowing only for qualitative detection. Additionally, time stability and batch-to-batch reproducibility of AHG were studied and negative influence of the pretreatment protocol and its limitations were estimated and discussed.
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Affiliation(s)
- Natalia E Markina
- Institute of Chemistry, Saratov State University, Astrakhanskaya 83, 410012 Saratov, Russia
| | - Alexey V Markin
- Institute of Chemistry, Saratov State University, Astrakhanskaya 83, 410012 Saratov, Russia.
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26
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Li P, Sirviö JA, Haapala A, Khakalo A, Liimatainen H. Anti-oxidative and UV-absorbing biohybrid film of cellulose nanofibrils and tannin extract. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2019.02.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Li Y, Li Z, Ye W, Zhao S, Yang Q, Ma S, Xiao G, Liu G, Wang Y, Yue Z. Gold nanorods and graphene oxide enhanced BSA-AgInS2 quantum dot-based photoelectrochemical sensors for detection of dopamine. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.11.121] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Chen X, Tang M, Liu Y, Huang J, Liu Z, Tian H, Zheng Y, de la Chapelle ML, Zhang Y, Fu W. Surface-enhanced Raman scattering method for the identification of methicillin-resistant Staphylococcus aureus using positively charged silver nanoparticles. Mikrochim Acta 2019; 186:102. [PMID: 30637528 DOI: 10.1007/s00604-018-3150-6] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 12/06/2018] [Indexed: 02/07/2023]
Abstract
The article describes a SERS-based method for diagnosis of bacterial infections. Positively charged silver nanoparticles (AgNPs+) were employed for identification of methicillin-resistant Staphylococcus aureus (MRSA). It is found that AgNPs+ undergo self-assembly on the surface of bacteria via electrostatic aggregation. The assembled AgNPs+ are excellent SERS substrates. To prove the capability of SERS to differentiate between S. aureus and other microorganisms, six standard strains including S. aureus 29213, S. aureus 25923, C. albicans, B. cereus, E. coli, and P. aeruginosa were tested. To further demonstrate its applicability for the identification of MRSA in clinical samples, 52 methicillin-sensitive S. aureus (MSSA) isolates and 215 MRSA isolates were detected by SERS. The total measurement time (include incubation) is 45 min when using a 3 μL sample. The method gives a strongly enhanced Raman signal (at 730 cm-1 and 1325 cm-1) with good reproducibility and repeatability. It was successfully applied to the discrimination of the six strain microorganisms. The typical Raman peaks of S. aureus at 730, 1154, 1325, and 1457 cm-1 were observed, which were assigned to the bacterial cell wall components (730 cm-1- adenine, glycosidic ring mode, 1154 cm-1- unsaturated fatty acid, 1325 cm-1- adenine, polyadenine, and 1457 cm-1 for -COO- stretching). S. aureus was completely separated from other species by partial least squares discriminant analysis (PLS-DA). Moreover, 52 MSSA isolates and 215 MRSA isolates from clinical samples were identified by PLS-DA. The accuracy was almost 100% when compared to the standard broth microdilution method. A classification based on latent structure discriminant analysis provided spectral variability directly. Conceivably, the method offers a potent tool for the identification of bacteria and antibiotics resistance, and for studies on antibiotic-resistance in general. Graphical abstract Schematic of the surface-enhanced Raman scattering (SERS) measurements on Staphylococcus aureus (S. aureus) using positively charged silver nanoparticles (AgNPs+). AgNPs+ are adsorbed on the bacterial cell wall by electrostatic attraction. SERS spectra were analyzed by PLS-DA for the identification of Staphylococcus aureus (MRSA) and methicillin-resistant Staphylococcus aureus (MSSA). MRSA isolates were divided into four groups, including R1, R2, R3, and R4. MSSA just includes group S.
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Affiliation(s)
- Xueping Chen
- Department of Laboratory Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China
| | - Meiqiong Tang
- Department of Laboratory Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China
| | - Yu Liu
- Department of Laboratory Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China
| | - Jiaoqi Huang
- Department of Laboratory Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China
| | - Zhiyong Liu
- Department of Laboratory Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China
| | - Huiyan Tian
- Department of Laboratory Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China
| | - Yuting Zheng
- Department of Laboratory Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China
| | - Marc Lamy de la Chapelle
- Institut des Molécules et Matériaux du Mans (IMMM - UMR CNRS 6283), Le Mans Université, Avenue Olivier Messiaen, 72085, Le Mans cedex 9, France
| | - Yang Zhang
- Department of Laboratory Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China. .,Department of Laboratory Medicine, Chongqing General Hospital, Chongqing, 400000, China.
| | - Weiling Fu
- Department of Laboratory Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China.
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Li P, Sirviö JA, Asante B, Liimatainen H. Recyclable deep eutectic solvent for the production of cationic nanocelluloses. Carbohydr Polym 2018; 199:219-227. [DOI: 10.1016/j.carbpol.2018.07.024] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 06/25/2018] [Accepted: 07/09/2018] [Indexed: 11/28/2022]
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Cao X, Hong S, Jiang Z, She Y, Wang S, Zhang C, Li H, Jin F, Jin M, Wang J. SERS-active metal-organic frameworks with embedded gold nanoparticles. Analyst 2018; 142:2640-2647. [PMID: 28612075 DOI: 10.1039/c7an00534b] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Surface-enhanced Raman scattering (SERS) has been widely used in the detection of targets and strongly depends on the interaction and the distance between the targets and nanoparticles. Herein, metal-organic frameworks (MOFs) were first easily synthesized on a large scale via a water bath method, especially Uio-66 and Uio-67. MOFs embedded with gold nanoparticles (AuNPs) for SERS enhancement were successfully fabricated via an impregnation strategy. The synthesized AuNPs/MOF-199, AuNPs/Uio-66, and AuNPs/Uio-67 composites, with LSPR properties and high adsorption capability of MOFs to preconcentrate the analytes close to the surface of the AuNPs, exhibited excellent SERS activity. The effects of the reducing concentrations of sodium citrate on the SERS activity, and the stability and reproducibility of the AuNP/MOFs have been discussed via the detection of acetamiprid. The SERS intensity enhanced by the composites was retained for more than 40 days under ambient conditions with the reducing concentrations of sodium citrate at 0.16%, 0.20%, and 0.16%. The limits of detection with the signal/noise ratio higher than 3 at the characteristic peak 632 cm-1 were 0.02 μM, 0.009 μM, and 0.02 μM for acetamiprid. Most interestingly, the AuNP/MOF-199 composites, whose morphology was long tube sheet, exhibited excellent SERS activity. These novel composites with high sensitivity, stability, and reproducibility provide a new route for the detection of pesticides via the SERS technology.
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Affiliation(s)
- Xiaolin Cao
- Key Laboratory of Agri-food Safety and Quality, Institute of Quality Standard and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Ministry of Agriculture of China, Beijing, 100081, P.R. China.
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Chen L, Ji Y, Hu X, Cui C, Liu H, Tang Y, Qi B, Niu Y, Hu X, Yu A, Fan Q. Cationic poly-l-lysine-encapsulated melanin nanoparticles as efficient photoacoustic agents targeting to glycosaminoglycans for the early diagnosis of articular cartilage degeneration in osteoarthritis. NANOSCALE 2018; 10:13471-13484. [PMID: 29972184 DOI: 10.1039/c8nr03791d] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Cartilage degeneration is the hallmark of osteoarthritis (OA) and its early diagnosis is essential for effective cartilage repair. However, until now, there was still a lack of imaging modalities that can accurately detect and evaluate cartilage degeneration in its early stage. Herein, we introduce endogenous melanin nanoparticles (MNPs) encapsulated by poly-l-lysine (PLL) as positively charged contrast agents for the accurate photoacoustic (PA) imaging of cartilage degeneration through its strong electrostatic interaction with anionic glycosaminoglycans (GAGs) in the cartilage. PLL-MNPs presented high PA intensity, photostability and biocompatibility. In vitro PAI studies showed that PLL-MNPs with a zeta potential of +32.5 ± 9.3 mV had more cartilage uptake and longer retention time than anionic MNPs, and generated a positive relationship with the GAG content in the cartilage. After administration via intra-articular injection in living mouse models, PLL-MNPs exhibited about a two-fold stronger PA signal in a normal joint (with high GAG content) than an OA joint (with low GAG content). Furthermore, the obtained PAI results provided accurate information of the GAG content distribution in the OA knee joint. Consequently, by detecting and analyzing the changes of the GAG content in OA cartilage using PAI, we can clearly distinguish early OA from late OA and monitor the therapeutic efficacy in OA after drug treatment. All PAI results were examined histologically.
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Affiliation(s)
- Liang Chen
- Department of Orthopedics, Zhongnan Hospital of Wuhan University, Wuhan 430071, Hubei, China.
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Weng X, Neethirajan S. Immunosensor Based on Antibody-Functionalized MoS 2 for Rapid Detection of Avian Coronavirus on Cotton Thread. IEEE SENSORS JOURNAL 2018; 18:4358-4363. [PMID: 32390783 PMCID: PMC7186039 DOI: 10.1109/jsen.2018.2829084] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 04/15/2018] [Accepted: 04/16/2018] [Indexed: 05/21/2023]
Abstract
Infectious bronchitis virus (IBV), an avian coronavirus, significantly affects the performance of both the egg-laying and meat-type birds causing the foremost of economic loss in poultry industry. This paper aims to develop a rapid, low-cost, and sensitive biosensor for IBV detection by using molybdenum disulfide (MoS2). MoS2 is a 2-D nanosheet which has strong high fluorescence-quenching ability when applied to a dye-labeled antibody (Ab). In this paper, we developed an Ab-functionalized MoS2-based fluorescent immunosensor, which utilized the fluorescence resonance energy transfer (FRET) between the MoS2 and fluorescence dye during the Ab-antigen interaction. The assay was performed on a low-cost cotton thread-based microfluidic platform due to the good wicking property and flexibility. Upon the optimization of assay conditions, the immunosensor demonstrated remarkable sensitivity of [Formula: see text] EID50 per mL and specificity with a dynamic linear response range of 102-106 EID50 per mL for IBV standard solutions. The developed immunoassay successfully detected the IBV spiked chicken serum with satisfactory results. The foregoing presents its potential application for on-farm detection.
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Affiliation(s)
- Xuan Weng
- BioNano Laboratory, School of EngineeringUniversity of GuelphGuelphONN1G 2W1Canada
| | - Suresh Neethirajan
- BioNano Laboratory, School of EngineeringUniversity of GuelphGuelphONN1G 2W1Canada
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Li Z, Zhang J, Li Y, Zhao S, Zhang P, Zhang Y, Bi J, Liu G, Yue Z. Carbon dots based photoelectrochemical sensors for ultrasensitive detection of glutathione and its applications in probing of myocardial infarction. Biosens Bioelectron 2018; 99:251-258. [DOI: 10.1016/j.bios.2017.07.065] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 07/16/2017] [Accepted: 07/26/2017] [Indexed: 10/19/2022]
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34
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Physicochemical properties and cytotoxicity of cysteine-functionalized silver nanoparticles. Colloids Surf B Biointerfaces 2017; 160:429-437. [DOI: 10.1016/j.colsurfb.2017.09.042] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 08/06/2017] [Accepted: 09/17/2017] [Indexed: 01/20/2023]
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35
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Calcium carbonate microparticles with embedded silver and magnetite nanoparticles as new SERS-active sorbent for solid phase extraction. Mikrochim Acta 2017. [DOI: 10.1007/s00604-017-2426-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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36
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Li P, Sirviö JA, Haapala A, Liimatainen H. Cellulose Nanofibrils from Nonderivatizing Urea-Based Deep Eutectic Solvent Pretreatments. ACS APPLIED MATERIALS & INTERFACES 2017; 9:2846-2855. [PMID: 27997111 DOI: 10.1021/acsami.6b13625] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Deep eutectic solvents (DESs) are a fairly new class of green solvents applied in various fields. This study investigates urea-based DES systems as novel pretreatments for cellulose nanofibril production. In the experiments, deep eutectic systems having urea and ammonium thiocyanate or guanidine hydrochloride as a second component were formed at 100 °C and then applied to disintegrate wood-derived cellulose fibers. The DES-pretreated fibers were nanofibrillated into three different levels of mechanical treatments with a microfluidizer, and their properties were analyzed. Moreover, nanofibril films were fabricated by solvent casting method. Both DES systems were able to loosen and swell the cellulose fiber structure as indicated by the increase in the lateral dimension of the fibers. Nonpretreated birch cellulose fibers had difficulties in mechanical nanofibrillation as clogging of the chamber occurred often. However, cellulose nanofibrils with widths ranging from 13.0 to 19.3 nm were successfully fabricated from DES-pretreated fibers with both systems. Translucent nanofibril films generated from DES-pretreated cellulose nanofibrils had good thermal stability and mechanical properties, with tensile strengths of approximately 135-189 MPa and elastic modulus of 6.4-7.7 GPa. Consequently, both urea-based DESs showed a high potential as environmentally friendly solvents in the manufacture of cellulose nanofibrils.
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Affiliation(s)
- Panpan Li
- Fibre and Particle Engineering Research Unit, University of Oulu , P. O. Box 4300, FI-90014 Oulu, Finland
| | - Juho Antti Sirviö
- Fibre and Particle Engineering Research Unit, University of Oulu , P. O. Box 4300, FI-90014 Oulu, Finland
| | - Antti Haapala
- Wood Materials Science, University of Eastern Finland , P. O. Box 111, FI-80101 Joensuu, Finland
| | - Henrikki Liimatainen
- Fibre and Particle Engineering Research Unit, University of Oulu , P. O. Box 4300, FI-90014 Oulu, Finland
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37
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Tavahodi M, Ortiz R, Schulz C, Ekhtiari A, Ludwig R, Haghighi B, Gorton L. Direct Electron Transfer of Cellobiose Dehydrogenase on Positively Charged Polyethyleneimine Gold Nanoparticles. Chempluschem 2016; 82:546-552. [PMID: 31961594 DOI: 10.1002/cplu.201600453] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/07/2016] [Indexed: 01/24/2023]
Abstract
Efficient conjugation between biomolecules and electrode materials is one of the main challenges in the field of biosensors. Cellobiose dehydrogenase (CDH) is a monomeric enzyme, which consists of two separate domains: one catalytic dehydrogenase domain (DHCDH ) carrying strongly bound flavin adenine dinucleotide (FAD) in the active site and a cytochrome domain (CYTCDH ) carrying a b-type heme connected by a flexible linker region. Herein, we report on the development of a lactose biosensor, based on direct electron transfer (DET) from CDH from Phanerochaete sordida (PsCDH) electrostatically attached onto polyethyleneimine-stabilized gold nanoparticles (PEI@AuNPs) used to cover a conventional polycrystalline solid gold disk electrode. PEI@AuNPs were synthesized in aqueous solution using PEI as reducing agent for AuIII and as stabilizer for the nanoparticles. The heterogeneous electron-transfer (ET) rate (ks ) for the redox reaction of immobilized PsCDH at the modified electrodes was calculated based on the Laviron theory and was found to be (39.6±2.5) s-1 . The proposed lactose biosensor exhibits good long term stability as well as high and reproducible sensitivity to lactose with a response time less than 5 s and a linear range from 1 to 100 μm.
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Affiliation(s)
- Mojtaba Tavahodi
- Department of Analytical Chemistry, Biochemistry and Structural Biology, Lund University, P.O. Box 124, 22100, Lund, Sweden.,Department of Chemistry, Institute for Advanced Studies in Basic Sciences, P.O. Box 45195-1159, Gava Zang, Zanjan, 45195-1159, Iran
| | - Roberto Ortiz
- Department of Analytical Chemistry, Biochemistry and Structural Biology, Lund University, P.O. Box 124, 22100, Lund, Sweden
| | - Christopher Schulz
- Department of Analytical Chemistry, Biochemistry and Structural Biology, Lund University, P.O. Box 124, 22100, Lund, Sweden
| | - Ali Ekhtiari
- Department of Analytical Chemistry, Biochemistry and Structural Biology, Lund University, P.O. Box 124, 22100, Lund, Sweden
| | - Roland Ludwig
- Department of Food Sciences and Technology, BOKU-University of Natural Resources and Life Sciences, Muthgasse 18, 1190, Wien, Austria
| | - Behzad Haghighi
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences, P.O. Box 45195-1159, Gava Zang, Zanjan, 45195-1159, Iran.,Department of Chemistry, Shiraz University, Shiraz, 71454, Iran
| | - Lo Gorton
- Department of Analytical Chemistry, Biochemistry and Structural Biology, Lund University, P.O. Box 124, 22100, Lund, Sweden
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Jia Y, Shmakov SN, Pinkhassik E. Controlled Permeability in Porous Polymer Nanocapsules Enabling Size- and Charge-Selective SERS Nanoprobes. ACS APPLIED MATERIALS & INTERFACES 2016; 8:19755-63. [PMID: 27186787 DOI: 10.1021/acsami.6b05522] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Nanoprobes for surface-enhanced Raman scattering (SERS) were prepared by creating nanorattles, or yolk-shell structures, containing gold or silver nanoparticles entrapped in porous hollow polymer nanocapsules. Controlled permeability of the shells of nanocapsules, achieved by controlling the pore size and/or shell surface functionalization, resulted in size- and charge-selective SERS analyses. For example, a trace amount of phenanthroline, a model analyte, was detected in human blood plasma without preprocessing of plasma samples. Comparison with commercially available nanoparticles showed superior performance of the newly prepared nanorattle structures.
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Affiliation(s)
- Ying Jia
- Department of Chemistry, Saint Louis University , 3501 Laclede Ave., St. Louis, Missouri 63103, United States
| | - Sergey N Shmakov
- Department of Chemistry, University of Connecticut , 55 North Eagleville Road, Storrs, Connecticut 06269, United States
| | - Eugene Pinkhassik
- Department of Chemistry, University of Connecticut , 55 North Eagleville Road, Storrs, Connecticut 06269, United States
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39
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SERS-active sorbent based on aluminum oxide loaded with silver nanoparticles. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.02.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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40
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Liao J, Wang D, Liu A, Hu Y, Li G. Controlled stepwise-synthesis of core-shell Au@MIL-100 (Fe) nanoparticles for sensitive surface-enhanced Raman scattering detection. Analyst 2016; 140:8165-71. [PMID: 26568098 DOI: 10.1039/c5an01657f] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A novel porous Au@MIL-100 (Fe) core-shell structure in which a Au nanoparticle (AuNP) core is coated with a controllable uniform metal-organic framework shell has been fabricated by using a facile step-by-step procedure. The as-synthesized Au@MIL-100 (Fe) takes advantage of the high adsorption capability of the MIL-100 (Fe) shell and the localized surface plasmon resonance properties of the AuNP core, and was used as a hybrid surface enhanced Raman scattering (SERS) substrate. We discussed the fabrication, physical characterization, and SERS activity of our novel substrate, and found that this new substrate had controllable shell thickness, high stability and good SERS activity. The potential practical application of the novel SERS substrate was firstly evaluated by quantitative analysis of malachite green in aquaculture water. The method showed good linearity between 3.0 × 10(-8)-1.0 × 10(-6) mol L(-1) for malachite green with a correlation coefficient of 0.9945. The limit of detection (LOD) was 8.0 × 10(-9) mol L(-1). Then the applicability of Au@MIL-100 (Fe) as the SERS substrate for in situ detection of malachite green on the fish body indicated its great potential as a rapid and on-site detection analytical strategy. In addition, the preliminary investigation also shows that the Au@MIL-100 (Fe) has SERS activity toward carbon disulfide which would be a new strategy for SERS-based gas sensors.
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Affiliation(s)
- Jia Liao
- School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
| | - Dongmei Wang
- School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
| | - Anqi Liu
- School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
| | - Yuling Hu
- School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
| | - Gongke Li
- School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
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41
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Chen L, Zhao Y, Wang Y, Zhang Y, Liu Y, Han XX, Zhao B, Yang J. Mercury species induced frequency-shift of molecular orientational transformation based on SERS. Analyst 2016; 141:4782-8. [DOI: 10.1039/c6an00945j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
We proposed a novel readout method based on a peculiar phenomenon in which the vibrational frequencies of a SERS-active probe (dimethyldithiocarbamic acid sodium salt, DASS) can be affected when there is mercury species.
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Affiliation(s)
- Lei Chen
- Key Laboratory of Preparation and Applications of Environmental Friendly Materials
- Ministry of Education
- College of Chemistry
- Jilin Normal University
- Siping 136000
| | - Yue Zhao
- Key Laboratory of Functional Materials Physics and Chemistry
- Ministry of Education
- Jilin Normal University
- Siping 136000
- P.R. China
| | - Yaxin Wang
- Key Laboratory of Functional Materials Physics and Chemistry
- Ministry of Education
- Jilin Normal University
- Siping 136000
- P.R. China
| | - Yongjun Zhang
- Key Laboratory of Functional Materials Physics and Chemistry
- Ministry of Education
- Jilin Normal University
- Siping 136000
- P.R. China
| | - Yang Liu
- Key Laboratory of Functional Materials Physics and Chemistry
- Ministry of Education
- Jilin Normal University
- Siping 136000
- P.R. China
| | - Xiao Xia Han
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- P. R. China
| | - Bing Zhao
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- P. R. China
| | - Jinghai Yang
- Key Laboratory of Functional Materials Physics and Chemistry
- Ministry of Education
- Jilin Normal University
- Siping 136000
- P.R. China
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Chen J, Shi YE, Zhang M, Zhan J. Diethyldithiocarbamate (DDTC) induced formation of positively charged silver nanoparticles for rapid in situ identification of inorganic explosives by surface enhanced Raman spectroscopy. RSC Adv 2016. [DOI: 10.1039/c6ra06111g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Diethyldithiocarbamate could induce the generation of positively charged silver nanoparticles for rapidin situdetection of the explosives with a portable Raman spectrometer.
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Affiliation(s)
- Juan Chen
- National Engineering Research Center for Colloidal Materials
- Key Laboratory for Colloid and Interface Chemistry of Ministry of Education
- Department of Chemistry
- Shandong University
- Jinan 250100
| | - Yu-e Shi
- National Engineering Research Center for Colloidal Materials
- Key Laboratory for Colloid and Interface Chemistry of Ministry of Education
- Department of Chemistry
- Shandong University
- Jinan 250100
| | - Min Zhang
- National Engineering Research Center for Colloidal Materials
- Key Laboratory for Colloid and Interface Chemistry of Ministry of Education
- Department of Chemistry
- Shandong University
- Jinan 250100
| | - Jinhua Zhan
- National Engineering Research Center for Colloidal Materials
- Key Laboratory for Colloid and Interface Chemistry of Ministry of Education
- Department of Chemistry
- Shandong University
- Jinan 250100
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Salvati E, Stellacci F, Krol S. Nanosensors for early cancer detection and for therapeutic drug monitoring. Nanomedicine (Lond) 2015; 10:3495-512. [DOI: 10.2217/nnm.15.180] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The use of nanotechnology for drug delivery in cancer therapy has raised high expectations. Additionally, the use of nanomaterials in sensors to extract and detect tumor specific biomarkers, circulating tumor cells, or extracellular vesicles shed by the tumor holds the promise to detect cancer much earlier and hence improve long-term survival of the patients. Moreover, the monitoring of the anticancer drug concentration, which has a narrow therapeutic window, will allow for a personalized dosing of the drug and will lead to improved therapeutic outcome and life quality of the patient. This review will provide an overview on the use of nanosensors for the early diagnosis of cancer and for the therapeutic drug monitoring, giving some examples. We envision nanosensors to make significant improvements in the cancer management as easy-to-use point-of-care devices for a broad population of users.
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Affiliation(s)
- Elisa Salvati
- IFOM, The FIRC Institute for Molecular Oncology Foundation, IFOM-IEO Campus, Via Adamello 16, 20139 Milan, Italy
| | - Francesco Stellacci
- Institute of Materials, École Polytechnique Fédérale de Lausanne, Station 12, CH–1015 Lausanne, Switzerland
- Fondazione IRCCS Institute of Neurology Carlo Besta, Via Amadeo 42, 20133 Milan, Italy
| | - Silke Krol
- Fondazione IRCCS Institute of Neurology Carlo Besta, Via Amadeo 42, 20133 Milan, Italy
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Zanchi C, Lucotti A, Tommasini M, Trusso S, de Grazia U, Ciusani E, Ossi PM. Au nanoparticle-based sensor for apomorphine detection in plasma. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2015; 6:2224-2232. [PMID: 26734514 PMCID: PMC4685758 DOI: 10.3762/bjnano.6.228] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 11/04/2015] [Indexed: 05/31/2023]
Abstract
Artificially roughened gold surfaces with controlled nanostructure produced by pulsed laser deposition have been investigated as sensors for apomorphine detection aiming at clinical application. The use of such gold surfaces has been optimized using aqueous solutions of apomorphine in the concentration range between 3.3 × 10(-4) M and 3.3 × 10(-7) M. The experimental parameters have been investigated and the dynamic concentration range of the sensor has been assessed by the selection of two apomorphine surface enhanced Raman scattering (SERS) peaks. The sensor behavior used to detect apomorphine in unfiltered human blood plasma is presented and discussed.
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Affiliation(s)
- Chiara Zanchi
- Dipartimento di Energia, Politecnico di Milano, Via Ponzio 34/3, 20133 Milano, Italy
| | - Andrea Lucotti
- Dipartimento di Chimica, Materiali e Ingegneria Chimica ‘Giulio Natta’, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
| | - Matteo Tommasini
- Dipartimento di Chimica, Materiali e Ingegneria Chimica ‘Giulio Natta’, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
| | - Sebastiano Trusso
- CNR-IPCF, Istituto per i Processi Chimico-Fisici del CNR, V.le. F. S. D’Alcontres 37, 98158 Messina, Italy
| | - Ugo de Grazia
- Laboratorio di Patologia Clinica e Genetica Medica, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, 20133 Milano, Italy
| | - Emilio Ciusani
- Laboratorio di Patologia Clinica e Genetica Medica, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, 20133 Milano, Italy
| | - Paolo M Ossi
- Dipartimento di Energia, Politecnico di Milano, Via Ponzio 34/3, 20133 Milano, Italy
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D’Souza S, Mashazi P, Britton J, Nyokong T. Effects of differently shaped silver nanoparticles on the photophysics of pyridylsulfanyl-substituted phthalocyanines. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.06.038] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Fateixa S, Nogueira HIS, Trindade T. Hybrid nanostructures for SERS: materials development and chemical detection. Phys Chem Chem Phys 2015; 17:21046-71. [PMID: 25960180 DOI: 10.1039/c5cp01032b] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This review focuses on recent developments in hybrid and nanostructured substrates for SERS (surface-enhanced Raman scattering) studies. Thus substrates composed of at least two distinct types of materials, in which one is a SERS active metal, are considered here aiming at their use as platforms for chemical detection in a variety of contexts. Fundamental aspects related to the SERS effect and plasmonic behaviour of nanometals are briefly introduced. The materials described include polymer nanocomposites containing metal nanoparticles and coupled inorganic nanophases. Chemical approaches to tailor the morphological features of these substrates in order to get high SERS activity are reviewed. Finally, some perspectives for practical applications in the context of chemical detection of analytes using such hybrid platforms are presented.
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Affiliation(s)
- Sara Fateixa
- Department of Chemistry-CICECO University of Aveiro, 3810-193 Aveiro, Portugal.
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Li M, Xiao Y, Zhang Z, Yu J. Bimodal sintered silver nanoparticle paste with ultrahigh thermal conductivity and shear strength for high temperature thermal interface material applications. ACS APPLIED MATERIALS & INTERFACES 2015; 7:9157-68. [PMID: 25890996 DOI: 10.1021/acsami.5b01341] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A bimodal silver nanoparticle (AgNP) paste has been synthesized via the simple ultrasonic mixing of two types of unimodal AgNPs (10 and 50 nm in diameter). By sintering this paste at 250 °C for 30 min, we obtained an ultrahigh thermal conductivity of 278.5 W m(-1) K(-1), approximately 65% of the theoretical value for bulk Ag. The shear strength before and after thermal cycling at 50-200 °C for 1000 cycles was approximately 41.80 and 28.75 MPa, respectively. The results show that this excellent performance is attributable to the unique sintered structures inside the bimodal AgNP paste, including its low but stable porosity and the high density coherent twins. In addition, we systematically discuss the sintering behavior of this paste, including the decomposition of the organic layers and the formation of the coherent twins. On the basis of these results, we confirm that our bimodal AgNP paste has excellent potential as a thermal interface material for high temperature power device applications.
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Affiliation(s)
- Mingyu Li
- State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, People's Republic of China
| | - Yong Xiao
- State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, People's Republic of China
| | - Zhihao Zhang
- State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, People's Republic of China
| | - Jie Yu
- State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, People's Republic of China
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Label-free surface-enhanced Raman spectroscopy of biofluids: fundamental aspects and diagnostic applications. Anal Bioanal Chem 2015; 407:8265-77. [DOI: 10.1007/s00216-015-8697-z] [Citation(s) in RCA: 126] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 04/09/2015] [Accepted: 04/10/2015] [Indexed: 01/11/2023]
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Faghihi F, Hazendonk P, Montina T. Investigation into the mechanism and microstructure of reaction intermediates in the two-phase synthesis of alkanethiol-capped silver nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3473-3481. [PMID: 25738982 DOI: 10.1021/la5047518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
To gain better control over the characteristics of the alkanethiol-capped silver nanoparticles (SNP) prepared by the two-phase method, the intermediate stage of this reaction and the structure of the precursor compound were investigated. Samples taken from the intermediate stage of the reaction were analyzed by NMR and vibrational spectroscopy both in solution and after solvent removal. The (1)H NMR chemical shifts of the complexes formed during the phase-transfer step were used to detect any structural changes that occur upon introduction of nonanethiol. Moreover, the presence of silver thiolate was monitored by comparing the FTIR and Raman spectra of silver nonanethiolate with the dried samples. Further insights into the microstructure of the intermediate compounds were sought by characterizing samples differing in molar ratios of tetraoctylammonium bromide (TOAB) to silver nitrate (AgNO3). (13)C solid-state NMR chemical shifts, (13)C relaxation times, and the DSC transitions of these samples revealed a dependence of their phase structure on the initial concentration of the reagents. At least two phases with distinct mobility and conformational ordering of their octyl chains were identified in the samples prepared with excess TOAB, which was associated with the presence of multiple anionic species. The observations regarding the composition of the phase-transfer product were further related to the quality of the resulting nanoparticles. It was demonstrated that a large excess of TOAB, which is commonly used in two-phase methods, can be avoided without compromising the size and dispersity of the silver nanoparticles produced. This modification to the synthetic procedure simplifies the purification of the product, mitigates the propensity of the nanoparticles for aggregation, and facilitates their redispersion.
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Affiliation(s)
- Farhad Faghihi
- Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive, Lethbridge AB T1K 3M4, Canada
| | - Paul Hazendonk
- Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive, Lethbridge AB T1K 3M4, Canada
| | - Tony Montina
- Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive, Lethbridge AB T1K 3M4, Canada
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Takahashi M, Mohan P, Nakade A, Higashimine K, Mott D, Hamada T, Matsumura K, Taguchi T, Maenosono S. Ag/FeCo/Ag core/shell/shell magnetic nanoparticles with plasmonic imaging capability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:2228-2236. [PMID: 25614919 DOI: 10.1021/la5046805] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Magnetic nanoparticles (NPs) have been used to separate various species such as bacteria, cells, and proteins. In this study, we synthesized Ag/FeCo/Ag core/shell/shell NPs designed for magnetic separation of subcellular components like intracellular vesicles. A benefit of these NPs is that their silver metal content allows plasmon scattering to be used as a tool to observe detection by the NPs easily and semipermanently. Therefore, these NPs are considered a potential alternative to existing fluorescent probes like dye molecules and colloidal quantum dots. In addition, the Ag core inside the NPs suppresses the oxidation of FeCo because of electron transfer from the Ag core to the FeCo shell, even though FeCo is typically susceptible to oxidation. The surfaces of the Ag/FeCo/Ag NPs were functionalized with ε-poly-L-lysine-based hydrophilic polymers to make them water-soluble and biocompatible. The imaging capability of the polymer-functionalized NPs induced by plasmon scattering from the Ag core was investigated. The response of the NPs to a magnetic field using liposomes as platforms and applying a magnetic field during observation by confocal laser scanning microscopy was assessed. The results of the magnetophoresis experiments of liposomes allowed us to calculate the magnetic force to which each liposome was subjected.
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Affiliation(s)
- Mari Takahashi
- School of Materials Science, Japan Advanced Institute of Science and Technology , 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
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