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Wang H, Xiao Y, Huang J, Huang M, Li K. A molecularly imprinted ratiometric fluorescent sensor for visual detection of 1-naphthol based on fluorescence-enhanced CdTeS QDs via APTES modification. Mikrochim Acta 2024; 191:412. [PMID: 38902398 DOI: 10.1007/s00604-024-06467-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Accepted: 05/25/2024] [Indexed: 06/22/2024]
Abstract
CdTeS quantum dots (CdTeS QDs) were synthesized using the hydrothermal method and subsequently modified with (3-aminopropyl)triethoxysilane (APTES). This modification resulted in a significant enhancement of the fluorescence intensity, which was observed to be five times stronger than that of unmodified CdTeS QDs at 597 nm. Only after the fluorescence enhancement by APTES modification, the material showed a response to 1-naphthol (1-NP). Based on this, the molecularly imprinted polymers (MIPs) with ratiometric fluorescence were developed for the detection of 1-NP, that is, the synthetic raw material and the metabolite of the pesticide carbaryl. Under the excitation of 365 nm UV, the bright orange-red fluorescence (597 nm) of CdTeS QDs encapsulated in MIPs was quenched by 1-NP in the suspension, and 1-NP showed a gradually increasing blue emission (460 nm) with the increase of its concentration. This sensor has a good linear relationship between fluorescence intensity ratio (F460/F597) and 1-NP concentration (C1-NP) in a large concentration range (6.0-140.0 µM, LOD=0.45 µM, RSD<4.41%). It exhibits a visible fluorescence change from orange-red to blue-purple. Excellent recoveries in real samples were obtained by simulating carbaryl metabolism and demonstrated its potential in detection of 1-NP and carbaryl.
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Affiliation(s)
- Hongwei Wang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Yue Xiao
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Jiangquan Huang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Maoliang Huang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Kang Li
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, China.
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Jinachandran A, Kokulnathan T, Wang TJ, Kumar KMA, Kumar J, Panneerselvam R. Silver nanopopcorns decorated on flexible membrane for SERS detection of nitrofurazone. Mikrochim Acta 2024; 191:347. [PMID: 38802574 DOI: 10.1007/s00604-024-06421-1] [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: 02/14/2024] [Accepted: 05/06/2024] [Indexed: 05/29/2024]
Abstract
The synthesis of three-dimensional silver nanopopcorns (Ag NPCs) onto a flexible polycarbonate membrane (PCM) for the detection of nitrofurazone (NFZ) on the fish surface by surface-enhanced Raman spectroscopy (SERS) is presented. The proposed flexible Ag-NPCs/PCM SERS substrate exhibits significant Raman signal intensity enhancement with the measured enhancement factor of 2.36 × 106. This is primarily attributed to the hotspots created on Ag NPCs, including numerous nanoscale protrusions and internal crevices distributed across the surface of Ag NPCs. The detection of NFZ by this flexible SERS substrate demonstrates a low limit of detection (LOD) of 3.7 × 10-9 M and uniform and reproducible Raman signal intensities with a relative standard deviation below 8.34%. It also exhibits excellent stability, retaining 70% of its efficacy even after 10 days of storage. Notably, the practical detection of NFZ in tap water, honey water, and fish surfaces achieves LOD values of 1.35 × 10-8 M, 5.76 × 10-7 M, and 3.61 × 10-8 M, respectively, which highlights its effectiveness across different sample types. The developed Ag-NPCs/PCM SERS substrate presents promising potential for sensitive SERS detection of toxic substances in real-world samples.
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Affiliation(s)
- Arunima Jinachandran
- Raman Research Laboratory, Department of Chemistry, SRM University-AP, Andhra Pradesh, Amaravati, 522503, India
| | - Thangavelu Kokulnathan
- Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei, 10608, Taiwan
| | - Tzyy-Jiann Wang
- Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei, 10608, Taiwan.
| | | | - Jayasree Kumar
- Raman Research Laboratory, Department of Chemistry, SRM University-AP, Andhra Pradesh, Amaravati, 522503, India
| | - Rajapandiyan Panneerselvam
- Raman Research Laboratory, Department of Chemistry, SRM University-AP, Andhra Pradesh, Amaravati, 522503, India.
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Wang L, Lai B, Ran X, Tang H, Cao D. A portable smartphone platform utilizing dual-sensing signals for visual determination of semicarbazide in food samples. J Mater Chem B 2024; 12:3469-3480. [PMID: 38506072 DOI: 10.1039/d4tb00001c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
Semicarbazide (SEM) is a metabolite of antibiotic nitrofurazone and a food contaminant in food production, showing potential carcinogenic, mutagenic, teratogenic, and toxic effects on human health. It is urgent to develop a highly efficient and sensitive assay for visual detection of SEM. In this paper, a pyrrolopyrrole cyanine fluorescent probe (PPCy-1) was reported for visualization and quantitative analysis of SEM through a chromophore reaction sensing mechanism for the first time. The probe towards SEM exhibited a fast response (10 min), a low detection limit (0.18 μM), high selectivity, and distinct dual ratiometric fluorescence turn-on and colorimetric modes. Its practicability was further verified by detecting SEM in meat, water, and honey samples with satisfactory recovery values. More importantly, a smartphone-assisted portable testing platform was constructed based on a PPCy-1-immobilized test paper or a polyamide thin film with a color scanning APP for real-time and on-site detection of SEM. This work provides low-cost, convenient, and rapid assays for visual SEM detection, which have potential applications in food safety monitoring.
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Affiliation(s)
- Lingyun Wang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510641, China.
| | - Bihong Lai
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510641, China.
| | - Xueguang Ran
- Institute of Animal Science, Guangdong Academy of Agricultural Sciences, State Key Laboratory of Swine and Poultry Breeding Industry, 510641, China
| | - Hao Tang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510641, China.
| | - Derong Cao
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510641, China.
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Li M, Zhou Y, Wang J, Chen Y. Efficient sensitization of CdTe QDs towards PTCDA for sensitive photoelectrochemical Hg 2+ assay. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:907-918. [PMID: 38250824 DOI: 10.1039/d3ay01779f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
Herein, a sensitive photoelectrochemical (PEC) biosensor was designed for the detection of mercury ions (Hg2+) on the basis of the efficient sensitization of cadmium telluride quantum dots (CdTe QDs) towards 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) and the significant quenching ability of a thymine-Hg2+-thymine (T-Hg2+-T) structure. The proposed CdTe QD/PTCDA sensitized structure was successfully constructed via continuous incubation of PTCDA and CdTe QDs on the glassy carbon electrode (GCE) interface, which embraced strong light absorption capacity and high carrier separation efficiency, giving rise to a remarkably improved initial photocurrent response. Notably, the PEC signal generated from the CdTe QD/PTCDA sensitized structure was almost fivefold higher than that of PTCDA owing to the efficient sensitization of CdTe QDs towards PTCDA. Once target Hg2+ ions were added, a T-rich S1 strand modified on the surface of 1-hexanethiol (HT)/S1/gold nanoparticles (Au NPs)/CdTe QDs/PTCDA/GCE immediately reacted with Hg2+ to produce multiple stable T-Hg2+-T structures. Therefore, the initial PEC signal would be considerably quenched by a high steric hindrance effect derived from the T-Hg2+-T structures. As a result, a quenched PEC response could achieve the detection of Hg2+ in concentrations ranging from 100 fM to 1000 nM. More importantly, the combination of the CdTe QDs/PTCDA sensitization structure and the T-Hg2+-T structure paves a promising pathway to developing a novel PEC biosensing platform for Hg2+ detection and also provides a favorable strategy for monitoring environmental pollution related to Hg2+.
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Affiliation(s)
- Mengjie Li
- School of Civil Engineering and Architecture, Chongqing University of Science & Technology, Chongqing 401331, China.
- JINSHAN Science & Technology (Group) Co., Ltd, Chongqing, 401120, China
- Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, Chongqing University, Chongqing, 400044, China
| | - You Zhou
- School of Civil Engineering and Architecture, Chongqing University of Science & Technology, Chongqing 401331, China.
| | - Jiapeng Wang
- School of Civil Engineering and Architecture, Chongqing University of Science & Technology, Chongqing 401331, China.
| | - Yang Chen
- School of Civil Engineering and Architecture, Chongqing University of Science & Technology, Chongqing 401331, China.
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Yang F, Yang B, Gu X, Li M, Qi K, Yan Y. Detection of enrofloxacin residues in dairy products based on their fluorescence quenching effect on AgInS 2 QDs. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 301:122985. [PMID: 37311364 DOI: 10.1016/j.saa.2023.122985] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 05/29/2023] [Accepted: 06/04/2023] [Indexed: 06/15/2023]
Abstract
Water-soluble AgInS2 (AIS) quantum dots (QDs) were successfully prepared through the one-pot water phase method with thioglycolic acid (TGA) as the stabilizing agent. Because enrofloxacin (ENR) effectively quenches the fluorescence of AIS QDs, a highly-sensitive fluorescence detection method is proposed to detect ENR residues in milk. Under optimal detection conditions, there was a good linear relationship between the relative fluorescence quenching amount (ΔF/F0) of AgInS2 with ENR and ENR concentration (C). The detection range was 0.3125-20.00 μg/mL, r = 0.9964, and the detection limit (LOD) was 0.024 μg/mL (n = 11). The average recovery of ENR in milk ranged from 95.43 to 114.28%. The method established in this study has advantages including a high sensitivity, a low detection limit, simple operation and a low cost. The fluorescence quenching mechanism of AIS QDs with ENR was discussed and the dynamic quenching mechanism of light-induced electron transfer was proposed.
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Affiliation(s)
- Fengjiao Yang
- College of Pharmacy, Dali University, Dali 671000, Yunnan, China
| | - Bingyu Yang
- College of Pharmacy, Dali University, Dali 671000, Yunnan, China
| | - Xinyue Gu
- College of Pharmacy, Dali University, Dali 671000, Yunnan, China
| | - Minghua Li
- College of Pharmacy, Dali University, Dali 671000, Yunnan, China
| | - Kezhen Qi
- College of Pharmacy, Dali University, Dali 671000, Yunnan, China.
| | - Ya Yan
- College of Pharmacy, Dali University, Dali 671000, Yunnan, China; Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China.
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