1
|
Dai J, Li J, Jiao Y, Yang X, Yang D, Zhong Z, Li H, Yang Y. Colorimetric-SERS dual-mode aptasensor for Staphylococcus aureus based on MnO 2@AuNPs oxidase-like activity. Food Chem 2024; 456:139955. [PMID: 38852453 DOI: 10.1016/j.foodchem.2024.139955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 05/07/2024] [Accepted: 06/01/2024] [Indexed: 06/11/2024]
Abstract
The nanozyme-linked aptamer-sorbent assay (NLASA) is a rapid way to screen and characterize aptamer binding to targets. In this paper, a MnO2@AuNPs@aptamer (Apt) based NLASA coupled with colorimetric-SERS dual-mode for Staphylococcus aureus (S. aureus) detection is presented. Cu,Fe-CDs were used as the reducing agent to synthesize MnO2 and gold nanoparticles (AuNPs). Then, they were fabricated to obtain MnO2@AuNPs with oxidase (OXD)-like and SERS activities. The S. aureus aptamer was conjugated to MnO2@AuNPs and enhanced the OXD-like activity, which realized the specific capture of S. aureus in food matrices. In addition, S. aureus improves the oxidation of 2,2'-azino-bis (3-ethylbenzthiazoline-6-sulfonic acid (ABTS) but inhibits 3,3',5,5'-tetramethylbenzidine (TMB) to generate Raman-active oxTMB with MnO2@AuNPs@Apt. This sensor was used for detections of S. aureus in a concentration ranged from 101 to 107 CFU/mL with a detection limit of 0.926 CFU/mL (colorimetric) and 1.561 CFU/mL (SERS), and the recovery is 85%-105% in real samples.
Collapse
Affiliation(s)
- Jiahe Dai
- College of Food Science and Technology, Yunnan Agricultural University, Kunming 650500, Yunnan, PR China
| | - Jitao Li
- Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, Yunnan Minzu University, Kunming 650500, Yunnan, PR China
| | - Yang Jiao
- Yunnan Lunyang Technology Co., Ltd., Kunming 650000, China
| | - Xiaolan Yang
- Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, Yunnan Minzu University, Kunming 650500, Yunnan, PR China
| | - Dezhi Yang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, Yunnan, PR China
| | - Zitao Zhong
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, Yunnan, PR China
| | - Hong Li
- College of Food Science and Technology, Yunnan Agricultural University, Kunming 650500, Yunnan, PR China.
| | - Yaling Yang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, Yunnan, PR China.
| |
Collapse
|
2
|
Wang C, Sun S, Wang P, Zhao H, Li W. Nanotechnology-based analytical techniques for the detection of contaminants in aquatic products. Talanta 2024; 269:125462. [PMID: 38039671 DOI: 10.1016/j.talanta.2023.125462] [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: 07/10/2023] [Revised: 09/26/2023] [Accepted: 11/21/2023] [Indexed: 12/03/2023]
Abstract
Food safety of aquatic products has attracted considerable attention worldwide. Although a series of conventional bioassays and instrumental methods have been developed for the detection of pathogenic bacteria, heavy metal residues, marine toxins, and biogenic amines during the production and storage of fish, shrimp, crabs et al., the nanotechnology-based analyses still have their advantages and are promising since they are cost-efficient, highly sensitive and selective, easy to conduct, facial design, often require no sophisticated instruments but with excellent detection performance. This review aims to summarize the advances of various biosensing strategies for bacteria, metal ions, and small molecule contaminants in aquatic products during the last five years, The review highlights the development in nanotechnologies applied for biorecognition process, signal transduction and amplification methods in each novel approach, the nuclease-mediated DNA amplification, nanomaterials (noble metal nanoparticle, metal-organic frameworks, carbon dots), lateral flow-based biosensor, surface-enhanced Raman scattering, microfluidic chip, and molecular imprinting technologies were especially emphasized. Moreover, this study provides a view of current accomplishments, challenges, and future development directions of nanotechnology in aquatic product safety evaluation.
Collapse
Affiliation(s)
- Chengke Wang
- College of Food Engineering, Yantai Key Laboratory of Nanoscience and Technology for Prepared Food, Yantai Engineering Research Center of Green Food Processing and Quality Control, Ludong University, Yantai, 264025, PR China; Institute of Bio-Nanotechnology, Ludong University, Yantai, 264025, PR China.
| | - Shuyang Sun
- College of Food Engineering, Yantai Key Laboratory of Nanoscience and Technology for Prepared Food, Yantai Engineering Research Center of Green Food Processing and Quality Control, Ludong University, Yantai, 264025, PR China; Institute of Bio-Nanotechnology, Ludong University, Yantai, 264025, PR China.
| | - Ping Wang
- College of Food Engineering, Yantai Key Laboratory of Nanoscience and Technology for Prepared Food, Yantai Engineering Research Center of Green Food Processing and Quality Control, Ludong University, Yantai, 264025, PR China; Institute of Bio-Nanotechnology, Ludong University, Yantai, 264025, PR China
| | - Huawei Zhao
- College of Food Engineering, Yantai Key Laboratory of Nanoscience and Technology for Prepared Food, Yantai Engineering Research Center of Green Food Processing and Quality Control, Ludong University, Yantai, 264025, PR China; Institute of Bio-Nanotechnology, Ludong University, Yantai, 264025, PR China
| | - Wenling Li
- College of Food Engineering, Yantai Key Laboratory of Nanoscience and Technology for Prepared Food, Yantai Engineering Research Center of Green Food Processing and Quality Control, Ludong University, Yantai, 264025, PR China
| |
Collapse
|
3
|
Zhang Y, Shi YE, Wang S, Song Q, Li W, Wang Z. Cobalt oxyhydroxide nanosheet-modulated ratiometric fluorescence platform for the selective detection of malachite green in fish. Mikrochim Acta 2024; 191:119. [PMID: 38300297 DOI: 10.1007/s00604-024-06200-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 01/08/2024] [Indexed: 02/02/2024]
Abstract
A ratiometric fluorescence platform was developed based on the cobalt oxyhydroxide (CoOOH) nanosheet-modulated fluorescence response of blue emissive copper nanoclusters (Cu NCs) and yellow emissive o-phenylenediamine (OPD). CoOOH nanosheets showed dual function of strong absorption and oxidation ability, which can effectively quench the blue fluorescence of Cu NCs, with an excitation and emission peak maximum at 390 and 450 nm, respectively , and transfer the OPD into yellow fluorescence products, with an excitation and emission peak maximum at 390 and 560 nm, respectively. Upon introducing butyrylcholinesterase (BChE) and its substrates, CoOOH nanosheets were decomposed into Co2+, and malachite green (MG) showed strong inhibition ability to this process. This resulted in the obvious difference on the ratio of blue and yellow fluorescence recorded on the system in the presence and absence of MG, which was utilized for the quantitative detection of MG, with a limit of detection of 0.140 μM and a coefficient of variation of 3.5%. The fluorescence ratiometric assay showed excellent detection performances in practical sample analysis.
Collapse
Affiliation(s)
- Yi Zhang
- State Key Laboratory of New Pharmaceutical Preparations and Excipients, Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry and Materials Science, Hebei University, Baoding, 071002, People's Republic of China
| | - Yu-E Shi
- State Key Laboratory of New Pharmaceutical Preparations and Excipients, Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry and Materials Science, Hebei University, Baoding, 071002, People's Republic of China.
| | - Shuaijing Wang
- College of Pharmaceutical Science, Hebei University, Baoding, 071002, People's Republic of China
| | - Qian Song
- State Key Laboratory of New Pharmaceutical Preparations and Excipients, Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry and Materials Science, Hebei University, Baoding, 071002, People's Republic of China
| | - Wei Li
- College of Pharmaceutical Science, Hebei University, Baoding, 071002, People's Republic of China
| | - Zhenguang Wang
- State Key Laboratory of New Pharmaceutical Preparations and Excipients, Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry and Materials Science, Hebei University, Baoding, 071002, People's Republic of China.
| |
Collapse
|
4
|
Qu L, Han J, Huang Y, Yang G, Liu W, Long Z, Gu Y, Zhang Q, Gao M, Dong X. Peroxidase-like Nanozymes for Point-of-Care SERS Sensing and Wound Healing. ACS APPLIED BIO MATERIALS 2023; 6:1272-1282. [PMID: 36854189 DOI: 10.1021/acsabm.3c00008] [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] [Indexed: 03/02/2023]
Abstract
The emergence of nanozymes provides a potential method for combating multidrug-resistant bacteria resulted from the abuse of antibiotics. However, in nanozyme-catalyzed systems, few studies have addressed the actual hydrogen peroxide (H2O2) level involved in sterilization. Herein, we designed a high-efficiency peroxidase-mimicking nanozyme with surface-enhanced Raman scattering (SERS) property by assembling gold nanoparticles on single-layer Cu2+-C3N4 (AuNP-Cu2+-C3N4). The nanozyme effectively converts the low-active Raman reporter 3,3',5,5'-tetramethylbenzidine (TMB) into its oxidized form with H2O2, resulting in SERS signal changes, thereby achieving highly sensitive quantification of H2O2 with limit of detection as low as 0.60 μM. More importantly, the nanozyme can specifically catalyze H2O2 into antibacterial hydroxyl radicals. In vitro and in vivo evaluations demonstrate the remarkable antibacterial efficacy of the nanozyme/H2O2 combination against Staphylococcus aureus (up to 99.9%), which could promote wound healing in mice and allow point-of-care monitoring the amount of H2O2 participated in effective sterilization. This study not only displays great potential in combining multiple functionalities of nanomaterials for versatile bioassays but also provides a promising approach to design nanozymes for biomedical and catalytic applications.
Collapse
Affiliation(s)
- Lulu Qu
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Jing Han
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Yi Huang
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Guohai Yang
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Weijie Liu
- School of Life Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Zhouyang Long
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Yingqiu Gu
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Qingming Zhang
- Department of Pharmacy, Jinling Hospital, Nanjing 210002, Jiangsu, China
| | - Ming Gao
- Department of Pharmacy, Jinling Hospital, Nanjing 210002, Jiangsu, China
| | - Xiaochen Dong
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing 211816, China
| |
Collapse
|
5
|
Zhu A, Ali S, Jiao T, Wang Z, Ouyang Q, Chen Q. Advances in surface-enhanced Raman spectroscopy technology for detection of foodborne pathogens. Compr Rev Food Sci Food Saf 2023; 22:1466-1494. [PMID: 36856528 DOI: 10.1111/1541-4337.13118] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 01/07/2023] [Accepted: 01/22/2023] [Indexed: 03/02/2023]
Abstract
Rapid control and prevention of diseases caused by foodborne pathogens is one of the existing food safety regulatory issues faced by various countries and has received wide attention from all sectors of society. The development of rapid and reliable detection methods for foodborne pathogens remains a hot research area for food safety and public health because of the limitations of complex steps, time-consuming, low sensitivity, or poor selectivity of commonly used methods. Surface-enhanced Raman spectroscopy (SERS), as a novel spectroscopic technique, has the advantages of high sensitivity, selectivity, rapid and nondestructive detection and has exhibited broad application prospects in the determination of pathogenic bacteria. In this study, the enhancement mechanisms of SERS are briefly introduced, then the characteristics and properties of liquid-phase, rigid solid-phase, and flexible solid-phase are categorized. Furthermore, a comprehensive review of the advances in label-free or label-based SERS strategies and SERS-compatible techniques for the detection of foodborne pathogens is provided, and the advantages and disadvantages of these methods are reviewed. Finally, the current challenges of SERS technology applied in practical applications are listed, and the possible development trends of SERS in the field of foodborne pathogens detection in the future are discussed.
Collapse
Affiliation(s)
- Afang Zhu
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, P. R. China
| | - Shujat Ali
- College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou, P. R. China
| | - Tianhui Jiao
- College of Food and Biological Engineering, Jimei University, Xiamen, P. R. China
| | - Zhen Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, P. R. China
| | - Qin Ouyang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, P. R. China
| | - Quansheng Chen
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, P. R. China.,College of Food and Biological Engineering, Jimei University, Xiamen, P. R. China
| |
Collapse
|
6
|
Zhang X, Zhao K, Wang X, Wang H, Yang W, Liu J, Li D. Surface-enhanced Raman spectroscopy for environmental monitoring using gold clusters anchored on reduced graphene oxide. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 856:158879. [PMID: 36152854 DOI: 10.1016/j.scitotenv.2022.158879] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 09/10/2022] [Accepted: 09/16/2022] [Indexed: 06/16/2023]
Abstract
Surface-enhanced Raman spectroscopy is a strong and sensitive analysis tool that can realize single-molecule level detection and provide the fingerprint information of molecules, which has been widely applied in analysing chemistry and biomolecules and monitoring environment. However, it is still a challenge to design and prepare SERS substrates with high enhancement factor, simple synthesis, stability and reproducibility. Here, we synthesized gold clusters anchored on reduced graphene oxide (Au clusters@rGO) using co-reduction method to achieve high SERS enhancement. The substrate of gold clusters anchored on reduced graphene oxide combines the chemical enhancement of reduced graphene oxide and the electromagnetic enhancement of gold clusters, leading to an ultrahigh enhancement factor of 3.5 × 107. The efficient SERS was ascribed to the high localized surface plasmon resonance (LSPR) of aggregations of gold clusters, the synergistic effect of gold clusters and reduced graphene oxide, and the charge transfer between graphene and the molecules. This research will provide an invaluable strategy to design and prepare superior-property SERS substrates.
Collapse
Affiliation(s)
- Xiangyu Zhang
- College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China
| | - Kai Zhao
- College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Xianhui Wang
- School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Hongbin Wang
- School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China
| | - Wenrong Yang
- School of Life and Environmental Sciences, Deakin University, 75 Pigdons Road, Waurn Ponds, VIC 3216, Australia.
| | - Jingquan Liu
- College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
| | - Da Li
- College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China.
| |
Collapse
|
7
|
Liang H, Luo Y, Li Y, Song Y, Wang L. An Immunosensor Using Electroactive COF as Signal Probe for Electrochemical Detection of Carcinoembryonic Antigen. Anal Chem 2022; 94:5352-5358. [PMID: 35311249 DOI: 10.1021/acs.analchem.1c05426] [Citation(s) in RCA: 46] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Two kinds of two-dimensional (2D) covalent-organic frameworks (COF) were used to construct a sandwich-type electrochemical immunosensor for a proof-of-concept study. Vinyl-functionalized COFTab-Dva could be linked with Ab1 by the thiol-ene "click" reaction. Electroactive COFTFPB-Thi was modified with gold nanoparticles (AuNPs) to ensure the successful connection with Ab2 through Au-S bond. Meanwhile, electroactive COFTFPB-Thi was used to as signal probe to realize both the detection of carcinoembryonic antigen (CEA) and the amplification of detection signal. In detection process of the sandwich-type electrochemical immunosensor, glassy carbon electrode (GCE) was modified with 2D COFTab-Dva first then connected with Ab1 by the thiol-ene "click" reaction, next quantitative CEA was captured, followed by specificially capturing signal probe of Ab2/AuNPs/COFTFPB-Thi where AuNPs acted as nanocarriers of Ab2 and COFTFPB-Thi served as the signal producers. As the amount of CEA was increased, the amount of signal probe captured to the electrode was also increased, and the peak signal intensity of the redox reaction of COFTFPB-Thi was enhanced accordingly. Thus, the quantitative detection of CEA could be realized according to the peak signal intensity of electroactive COFTFPB-Thi. The electrochemical immunosensor owned wide detection range of 0.11 ng/mL-80 ng/mL, low detection limit of 0.034 ng/mL and good practicability. This study opens up a new revelation for quantitative detection of CEA using electroactive COF as enhanced signal probe.
Collapse
Affiliation(s)
- Huihui Liang
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Ying Luo
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Yanyan Li
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Yonghai Song
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Li Wang
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| |
Collapse
|
8
|
Song S, Li N, Bai L, Gai P, Li F. Photo-Assisted Robust Anti-Interference Self-Powered Biosensing of MicroRNA Based on Pt-S Bonds and the Inorganic-Organic Hybridization Strategy. Anal Chem 2022; 94:1654-1660. [PMID: 35025211 DOI: 10.1021/acs.analchem.1c04135] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Photo-assisted biofuel cell-based self-powered biosensors (PBFC-SPBs) possess the advantages of no need for external power supply, ease of sensing design, and simple instruments. In this work, a robust anti-interference PBFC-SPB for microRNA detection was constructed based on the Pt-S bond and the inorganic-organic hybridization strategy. The organic semiconductor [6,6]-phenyl-C61-butyric acid methylester@anthraquinone (PCBM@anthraquinone) served as an efficient light-harvesting material, and gold nanoparticle@Pt (AuNP@Pt) nanomaterials were immobilized on the surface via electrostatic adsorption for the binding of DNA. Notably, compared to Au-S bonds for DNA immobilization, the Pt-S bond exhibited better anti-interference ability. Ingeniously, cadmium sulfide quantum dots (CdS QDs) were close to the PCBM@anthraquinone substrate electrode to form sensitization structures, which was beneficial to enhance the photocurrent signal. Combining with the laccase-mimicking activity Cu2+/carbon nanotubes (Cu2+/CNTs) cathode, the PBFC-SPB for microRNA detection was achieved. Once the target existed, the identical sequence complementary microRNA would make DNA2/CdS dissociate and break away from the electrode, leading to a low signal. The linear detection range was 10 fM-100 pM, with the limit of determination of 2.4 fM (3S/N). The as-proposed strategy not only paves a new way for the design of photoelectrochemical biosensing but also opens a door for the construction of robust anti-interference bioassay for microRNA detection.
Collapse
Affiliation(s)
- Shichao Song
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, People's Republic of China
| | - Na Li
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, People's Republic of China
| | - Lipeng Bai
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, People's Republic of China
| | - Panpan Gai
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, People's Republic of China
| | - Feng Li
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, People's Republic of China
| |
Collapse
|
9
|
Ag Nanoislands Modified Carbon Fiber Nanostructure: A Versatile and Ultrasensitive Surface-Enhanced Raman Scattering Platform for Antiepileptic Drug Detection. COATINGS 2021. [DOI: 10.3390/coatings12010004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A high-efficiency surface-enhanced Raman scattering (SERS) detection method with ultra-high sensitivity has been widely applied in drug component detection to optimize the product quality verification standards. Herein, a controllable strategy of sputtering Ag nanoislands on carbon fiber (C-fiber) via magnetron sputtering technology was proposed to fabricate a versatile Ag-C-fiber SERS active substrate. A wide range of multi-level electromagnetic enhancement “hot spots” distributed on Ag-C-fiber nanostructures can efficiently amplify Raman signals and the experimental enhancement factor (EEF) value was 3.871 × 106. Furthermore, substantial “hot spots” of large-scale distribution guaranteed the superior reproducibility of Raman signal with relative standard deviation (RSD) values less than 12.97%. Limit of detection (LOD) results indicated that when crystal violet (CV) is employed as probe molecule, the LOD was located at 1 × 10−13 M. By virtue of ultra-sensitivity and good flexibility of the Ag-C-fiber nanotemplate, Raman signals of two kinds of antiepileptic drugs called levetiracetam and sodium valproate were successfully obtained using an SERS-based spectral method. The Ag-C-fiber SERS detection platform demonstrated a good linear response (R2 = 0.97486) in sensing sodium valproate concentrations in the range of 1 × 103 ng/μL−1–1 ng/μL. We believe that this reliable strategy has potential application for trace detection and rapid screening of antiepileptic drugs in the clinic.
Collapse
|