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Xiong H, Wang M, Qiang R, Wu Y, Zheng X. TiO 2/Ag-based photodeposited catalyst boosted electrochemiluminescence of ninhydrin-hydrogen peroxide system for ultrasensitive sensing of copper (II). Anal Chim Acta 2024; 1290:342223. [PMID: 38246740 DOI: 10.1016/j.aca.2024.342223] [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: 12/11/2023] [Accepted: 01/07/2024] [Indexed: 01/23/2024]
Abstract
Photodeposited TiO2/Ag nanocomposites were generally used to be a friendly catalyst for degrading organic contaminant in environmental field. However, electrochemiluminescence (ECL) sensing analysis based on photocatalysts remains a significant challenge. Herein, polyvinylimide (PEI)-TiO2/Ag nanocomposites (PEI-TiO2/AgNCPs) film with reduced graphene oxide(r-GO) was constructed as a sensing interface for copper(II) ECL detection. TiO2/Ag nanocomposites was prepared by reversed phase microemulsion method and photodeposition technique. Moreover, it was discovered that a small amount of Cu2+ could obviously boost the ECL signal of ninhydrin-hydrogen peroxide system. Signal amplification was achieved by using the synergistic effect between r-GO and TiO2/Ag nanocomposites, and the efficiently concentrated effect of PEI to Cu2+. Furthermore, the investigation showed that ECL mechanism of ninhydrin-hydrogen peroxide system was attributed to the generated hydroxyl radical and superoxide anion during the several type of reactions. Thus for the first time, an ultrasensitive ECL approach for detecting Cu2+ could be performed using ninhydrin as an ECL signal probe and hydrogen peroxide as a co-reaction reagent. Under the suitable circumstances, the proposed method showed an excellent linear relationship in the concentration range of Cu2+ from 1.0 fM to 5.0 nM. Detection limit was estimated to be as low as 0.26 fM. The sensing interface expanded the application of photodeposited TiO2/Ag nanocomposites in ultrasensitive ECL detection. It has potential applications in other components and biological analysis.
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Affiliation(s)
- Haitao Xiong
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environmental Sciences, Shaanxi University of Technology, HanZhong, 723001, PR China.
| | - Mengyang Wang
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environmental Sciences, Shaanxi University of Technology, HanZhong, 723001, PR China
| | - Ruirui Qiang
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environmental Sciences, Shaanxi University of Technology, HanZhong, 723001, PR China
| | - Yingchun Wu
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environmental Sciences, Shaanxi University of Technology, HanZhong, 723001, PR China
| | - Xingwang Zheng
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, PR China
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He X, Ji W, Xing S, Feng Z, Li H, Lu S, Du K, Li X. Emerging trends in sensors based on molecular imprinting technology: Harnessing smartphones for portable detection and recognition. Talanta 2024; 268:125283. [PMID: 37857111 DOI: 10.1016/j.talanta.2023.125283] [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: 09/03/2023] [Revised: 10/04/2023] [Accepted: 10/05/2023] [Indexed: 10/21/2023]
Abstract
Molecular imprinting technology (MIT) has become a promising recognition technology in various fields due to its specificity, high efficiency, stability and eco-friendliness in the recognition of target. Molecularly imprinted polymers (MIPs), known as 'artificial receptors', are shown similar properties to natural receptors as a biomimetic material. The selectivity of recognition for targets can be greatly improved when MIPs are introduced into sensors, as known that MIPs, are suitable for the pretreatment and analysis of trace substances in complex matrix samples. At present, various sensors has been developed by the combination with MIPs for detecting and identifying trace compounds, biological macromolecules or other substances, such as optical, electrochemical and piezoelectric sensors. Smart phones, with their built-in sensors and powerful digital imaging capabilities, provide a unique platform for the needs of portability and instant detection. MIP sensors based on smart phones are expected to become a new research direction in the future. This review discusses the latest applications of MIP sensors in the field of detection and recognition in recent years, summarizes the frontier progress of MIP sensor research based on smart phones in the past two years, and points out the challenges, limitations and future development prospects.
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Affiliation(s)
- Xicheng He
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China; Tianjin Key Laboratory of Therapeutic Substance of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China
| | - Wenliang Ji
- College of Chemistry, Beijing Normal University, Beijing, 100875, China
| | - Sijia Xing
- Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China
| | - Zhixuan Feng
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China
| | - Hongyan Li
- Tianjin JOYSTAR Technology Co., Ltd, No.453, Hengshan Road, Modern Industrial Park, Tianjin Economic Technological Development Area, Tianjin, 300457, China
| | - Shanshan Lu
- BaiyangDian Basin Ecological Environment Monitoring Center, Baoding, Hebei, 071000, China
| | - Kunze Du
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China; Tianjin Key Laboratory of Phytochemistry and Pharmaceutical Analysis, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China.
| | - Xiaoxia Li
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China; Tianjin Key Laboratory of Therapeutic Substance of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China.
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Chen Q, Yao L, Xu J, Qi Q, Tao S, Song X, Chen W. Stepwise Au decoration-assisted double signal amplified lateral flow strip for ultrasensitive detection of morphine in fingerprint sweat. Anal Chim Acta 2023; 1278:341684. [PMID: 37709439 DOI: 10.1016/j.aca.2023.341684] [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: 05/03/2023] [Revised: 07/14/2023] [Accepted: 08/01/2023] [Indexed: 09/16/2023]
Abstract
Point-of-care testing (POCT) of morphine (MOP) without invasion of privacy is of critical importance for law-enforcement departments to realize on-site rapid screening. In this study, ultrasensitive and non-invasive screening of MOP residues in the fingerprint sweat was easily realized by stepwise Au decoration-assisted double signal amplification and antibody-saving strategies on lateral flow strip (LFS). The construction of LFS was not intrinsically changed compared with traditional LFS except the labeling material on conjugation pad for enhanced signal reporting. The gold nanoparticle-seeded SiO2 was adopted as the labeling materials in place of traditional gold nanoparticles, which acted as the first-round signal amplification and ready for second-round gold deposition-assisted amplification. And the second-round amplification could be completed in just 10 s, which did not alter the intrinsic simplicity of LFS for rapid and on-site screening. With the designed signal amplification principle of LFS, target MOP in the fingerprint sweat can be effectively transferred to the LFS for analysis without invasion of privacy. As low as 0.5 pg MOP in fingerprint sweat can be visually judged with this double signal amplified LFS, the sensitivity of which has been improved at least 10-fold compared with traditional Au-labeled LFS, guaranteeing accurate screening of trace MOP in the fingerprint sweat. Of great importance, the consumption of valuable antibody can be reduced to just 1/20, which greatly reduces the cost of high-throughput screening. This stepwise Au decoration-assisted double signal amplified LFS holds great potential in the ultrasensitive screening of trace analytes in various fields and further widens the application scope of lateral flow strips.
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Affiliation(s)
- Qi Chen
- Research Center of Bio-process, MOE, School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Li Yao
- Research Center of Bio-process, MOE, School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Jianguo Xu
- Research Center of Bio-process, MOE, School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Qiujing Qi
- Evidence Identification Center of Anhui Province Public Security Department, Hefei, 230061, China
| | - Sha Tao
- Second School of Clinical Medicine, Anhui Medical University, Hefei, 230032, China
| | - Xin Song
- Criminal Police Detachment of Hefei Public Bureau, Hefei, 230051, China.
| | - Wei Chen
- Research Center of Bio-process, MOE, School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China.
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