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Wu H, Bu T, Cao Y, Wang Y, Xi J, Li M, Li R, Jia P, Wang L. Double-Enzyme Active Vanadium Nanospheres-Mediated Ratiometric Multicolor Immunosensors for Sensitive Detection of the T-2 Toxin. Anal Chem 2023; 95:5275-5284. [PMID: 36898021 DOI: 10.1021/acs.analchem.2c05197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Owing to its high throughput, simplicity, and rapidity, enzyme-linked immunosorbent assay (ELISA) has attracted much attention in the field of immunoassays. However, the traditional ELISA usually affords a single signal readout and the labeling ability of the enzyme used is poor, resulting in low accuracy and a limited detection range. Herein, a vanadium nanospheres (VNSs)-mediated competitive ratio nanozymes-linked immunosorbent assay (VNSs-RNLISA) was created for the sensitive detection of the T-2 toxin (T-2). As the key to the biosensor, the VNSs with superoxide dismutase-like and peroxidase-like dual-enzyme mimetic activities were synthesized by a one-step hydrothermal method, which oxidized 1,1-diphenyl-2-picryl-hydrazyl fading and catalyzed 3,3',5,5'-tetramethylbenzidine (TMB) color development. Therefore, T-2 could not only be qualitatively measured with the naked eye but also be quantitatively evaluated by monitoring the ratio of absorbance at 450 and 517 nm wavelengths. Moreover, the characterization of a VNSs-labeled antibody probe showed strong dual-enzymatic activity, excellent stability, and high affinity with T-2 [the affinity constant (ka) was approximately 1.36 × 108 M-1], which can significantly improve the detection sensitivity. The limit of detection of VNSs-RNLISA was 0.021 ng/mL, which was approximately 27-fold more sensitive than the single signal nanozymes-linked immunosorbent assay (0.561 ng/mL). Besides, the change in the ratio of absorbance (Δ450/Δ517) decreased linearly in a range of 0.22-13.17 ng/mL, outperforming the detection range of a single-mode nano-enzyme-linked immunosorbent assay using TMB by a factor of 1.6 times. Furthermore, the VNSs-RNLISA was successfully used to identify T-2 in maize and oat samples, with recoveries ranging from 84.216 to 125.371%. Overall, this tactic offered a promising platform for the quick detection of T-2 in food and might broaden the application range of the enzyme-linked immunosorbent assay.
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Affiliation(s)
- Haiyu Wu
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.,Shenzhen Research Institute, Northwest A&F University, Shenzhen 518000, China
| | - Tong Bu
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.,College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, Henan, China
| | - Yuanyuan Cao
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.,Shenzhen Research Institute, Northwest A&F University, Shenzhen 518000, China
| | - Ying Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.,Shenzhen Research Institute, Northwest A&F University, Shenzhen 518000, China
| | - Jia Xi
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.,Shenzhen Research Institute, Northwest A&F University, Shenzhen 518000, China
| | - Mingyan Li
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.,Shenzhen Research Institute, Northwest A&F University, Shenzhen 518000, China
| | - Ruixia Li
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.,Shenzhen Research Institute, Northwest A&F University, Shenzhen 518000, China
| | - Pei Jia
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.,Shenzhen Research Institute, Northwest A&F University, Shenzhen 518000, China
| | - Li Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.,Shenzhen Research Institute, Northwest A&F University, Shenzhen 518000, China
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Li X, Chen G, Hu A, Xiong Y, Yang T, Ma C, Li L, Gao H, Zhu C, Zhang W, Cai Z. Detection of mercury(II) and glutathione using a carbon dots-based "off-on" fluorescent sensor and the construction of a logic gate. Anal Bioanal Chem 2023; 415:1397-1409. [PMID: 36639530 DOI: 10.1007/s00216-023-04517-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/21/2022] [Accepted: 01/03/2023] [Indexed: 01/15/2023]
Abstract
In this paper, we proposed an efficient method for mercury(II) and glutathione detection using a fluorescent nanoprobe as a sensor. Carbon dots were synthesized from polyethyleneimine and ammonium citrate via a one-step hydrothermal method. The fluorescence of carbon dots was quenched since electron transfer occurred due to the interaction between mercury(II) and functional groups on the surface of carbon dots. Adding glutathione to the carbon dots-mercury(II) system, the fluorescence was recovered due to the stronger binding ability of glutathione to mercury(II). Based on the above-mentioned principle, this "off-on" fluorescent sensor can easily achieve the detection of mercury(II) and glutathione, which provided limits of detection of 22.45 nM and 61.89 nM, respectively. In this paper, the proposed method has been applied to detect mercury(II) and glutathione in real lake water and serum, respectively, and a logic gate for sensing glutathione was presented. The developed "off-on" fluorescent sensor with high sensitivity and selectivity has shown great potential for mercury(II) and glutathione detection in environmental and biosensing fields.
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Affiliation(s)
- Xin Li
- School of Science, Jiangnan University, Wuxi, 214122, China.,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China
| | - Guoqing Chen
- School of Science, Jiangnan University, Wuxi, 214122, China. .,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China.
| | - Anqi Hu
- School of Science, Jiangnan University, Wuxi, 214122, China.,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China
| | - Yi Xiong
- School of Science, Jiangnan University, Wuxi, 214122, China.,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China
| | - Taiqun Yang
- School of Science, Jiangnan University, Wuxi, 214122, China.,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China
| | - Chaoqun Ma
- School of Science, Jiangnan University, Wuxi, 214122, China.,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China
| | - Lei Li
- School of Science, Jiangnan University, Wuxi, 214122, China.,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China
| | - Hui Gao
- School of Science, Jiangnan University, Wuxi, 214122, China.,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China
| | - Chun Zhu
- School of Science, Jiangnan University, Wuxi, 214122, China.,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China
| | - Wei Zhang
- School of Science, Jiangnan University, Wuxi, 214122, China.,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China
| | - Zicheng Cai
- School of Science, Jiangnan University, Wuxi, 214122, China.,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi, 214122, China
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Dong E, Chen T, Fang M, Zhu W, Li C. Construction of continuously enhanced fluorescent sensor for detection of glutathione in normal and cancer cells. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 287:122064. [PMID: 36347165 DOI: 10.1016/j.saa.2022.122064] [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: 08/23/2022] [Revised: 10/26/2022] [Accepted: 10/29/2022] [Indexed: 06/16/2023]
Abstract
In this paper, water-soluble cysteamine (CA)-capping CdSe quantum dots (CA-CdSe) could be used as a continuous fluorescent sensor. The CA-CdSe QDs can respond to Ag+ with a detection limit of 54.1 nM. Interestingly, CA-CdSe quantum dots combined with Ag+ to generate a new nano-fluorescence sensor-Ag+ modified CA-CdSe QDs (Ag+@CA-CdSe). Ag+@CA-CdSe can detect glutathione (GSH) with good sensitivity and anti-interference performance. The detection limit of Ag+@CA-CdSe fluorescenct sensor for GSH is as low as 0.74 μM. In addition, the novel nano-fluorescent sensor Ag+@CA-CdSe exhibited good cell permeability and was successfully applied to detect exogenous and endogenous GSH concentrations in cells. It could distinguish cancerous and normal cells by in vitro cell fluorescence imaging.
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Affiliation(s)
- Erfei Dong
- School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, PR China
| | - Ting Chen
- School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, PR China
| | - Min Fang
- School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, PR China; Anhui Province Key Laboratory of Environment-friendly Polymer Materials, Anhui University, Hefei 230601, PR China.
| | - Weiju Zhu
- School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, PR China; AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei 230601, PR China
| | - Cun Li
- School of Materials Science and Engineering, Anhui University, Hefei 230601, PR China; AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei 230601, PR China.
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Selective Determination of Glutathione Using a Highly Emissive Fluorescent Probe Based on a Pyrrolidine-Fused Chlorin. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28020568. [PMID: 36677627 PMCID: PMC9862258 DOI: 10.3390/molecules28020568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/16/2022] [Accepted: 12/27/2022] [Indexed: 01/09/2023]
Abstract
We report the use of a carboxylated pyrrolidine-fused chlorin (TCPC) as a fluorescent probe for the determination of glutathione (GSH) in 7.4 pH phosphate buffer. TCPC is a very stable, highly emissive molecule that has been easily obtained from meso-tetrakis(4-methoxycarbonylphenyl) porphyrin (TCPP) through a 1,3-dipolar cycloaddition approach. First, we describe the coordination of TCPC with Hg(II) ions and the corresponding spectral changes, mainly characterized by a strong quenching of the chlorin emission band. Then, the TCPC-Hg2+ complex exhibits a significant fluorescence turn-on in the presence of low concentrations of the target analyte GSH. The efficacy of the sensing molecule was tested by using different TCPC:Hg2+ concentration ratios (1:2, 1:5 and 1:10) that gave rise to sigmoidal response curves in all cases with modulating detection limits, being the lowest 40 nM. The experiments were carried out under physiological conditions and the selectivity of the system was demonstrated against a number of potential interferents, including cysteine. Furthermore, the TCPC macrocycle did not showed a significant fluorescent quenching in the presence of other metal ions.
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