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Ge J, Zhai Z, Chen Y, Li Z, Yang H, Cai R. Nitrogen-doped MoS 2 QDs as fluorescent probes for sensitive detection of curcumin and cell imaging. Anal Chim Acta 2024; 1325:343090. [PMID: 39244300 DOI: 10.1016/j.aca.2024.343090] [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: 05/09/2024] [Revised: 07/21/2024] [Accepted: 08/09/2024] [Indexed: 09/09/2024]
Abstract
BACKGROUND Curcumin has been used in traditional medicine because of its pharmacological activity, including antioxidant, antibacterial, anticancer, and anticarcinogenic properties. Therefore, sensitive and selective monitoring of curcumin is highly demand for practical application. RESULTS In this study, we describe the construction of a fluorescence method for curcumin assay based on nitrogen-doped MoS2 quantum dots (N-MoS2 QDs). The N-MoS2 QDs are constructed by a solvothermal method using sodium molybdate and Cys as precursors. With the addition of curcumin, the bright blue fluorescence of N-MoS2 QDs is quenched by the inner filter effect (IFE). The QDs emitted bright blue fluorescence and could be quenched by the addition of curcumin via IFE. The dynamic range is the range of 0.1-10 μM for curcumin detection, with a detection limit of 59 nM. N-MoS2 QDs were applied for curcumin assay in real samples with good recovery. In addition, the N-MoS2 QDs exhibited relative low cytotoxicity and could be applied for fluorescence-based imaging in biological samples. SIGNIFICANCE Our study indicates that the sensor possesses good selectivity to monitor curcumin in water samples, human urine samples, ginger powder samples, mustard samples, and curry samples with satisfactory recoveries. The N-MoS2 QDs possess less cytotoxicity with excellent biocompatibility and were applied for in vitro cell imaging.
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Affiliation(s)
- Jia Ge
- College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
| | - Zhiyao Zhai
- College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
| | - Yuru Chen
- Henan Provincial Fair Competition Review Affairs Center, Zhengzhou, 450001, China.
| | - Zhaohui Li
- College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.
| | - Hongfen Yang
- Hunan Key Laboratory of Typical Environmental Pollution and Health Hazards, School of Public Health, Hengyang Medical School, University of South China, Hengyang, 421001, China
| | - Ren Cai
- Molecular Science and Biomedicine Laboratory, State Key Laboratory for Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, and Collaborative Research Center of Molecular Engineering for Theranostics, Hunan University, Changsha, 410082, China.
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2
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Wang L, Xu S, Chen J, Li R, Chen Q, Chen X. Ratiometric fluorescence method comprising carbon dots and rhodamine 6G encapsulated in metal-organic framework microcubes for curcumin detection. Mikrochim Acta 2024; 191:337. [PMID: 38777890 DOI: 10.1007/s00604-024-06430-0] [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: 03/24/2024] [Accepted: 05/12/2024] [Indexed: 05/25/2024]
Abstract
A ratiometric fluorescence method comprising carbon dots (CDs) and rhodamine 6G (Rh-6G) encapsulated in the microcubes of metal-organic framework (MOF-5) is introduced for the sensitive detection of curcumin (Cur) in condiments. CDs@MOF-5@Rh-6G, synthesized by the adsorption of Rh-6G on MOF-5 embedded with CDs, showed two distinct emission peaks at 435 and 560 nm under excitation at 335 nm, and could be used for Cur detection by ratiometric fluorescence. In the presence of Cur, the fluorescence of the CDs at 435 nm (F435) was quenched by Cur owing to internal filtering and dynamic quenching effects, whereas the emission of Rh-6G at 560 nm (F560) remained unchanged (335 nm is the excitation wavelength, 435 and 560 nm are the emission wavelengths, in which F435/F560 values are used as the output results). Under optimal conditions, a linear relationship was observed between the Cur concentration (in the range 0.1-5 μmol/L) and F435/F560 value for CDs@MOF-5@Rh-6G, with a detection limit of 15 nmol/L. Notably, the proposed method could accurately detect Cur in mustard, curry, and red pepper powders. Therefore, this study could improve the quality control of food and facilitate the development of sensitive ratiometric fluorescence probes.
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Affiliation(s)
- Li Wang
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Shifen Xu
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Jing Chen
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Rundong Li
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Quansheng Chen
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Xiaomei Chen
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China.
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Liu Y, Gao R, Liu X, Zheng J, Wu X. High-efficiency fluorescent coordination polymer nanoparticles co-doped with Ce 3+/Tb 3+ ions for curcumin detection. Mikrochim Acta 2023; 190:354. [PMID: 37587349 DOI: 10.1007/s00604-023-05933-6] [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: 04/22/2023] [Accepted: 07/25/2023] [Indexed: 08/18/2023]
Abstract
Curcumin (Cur) possesses diverse biological and pharmacologic effects. It is widely used as a food additive and therapeutic medicine. A study to determine a sensitive detection method for Cur is necessary and meaningful. In this work, double rare earth ions co-doped fluorescent coordination polymer nanoparticles (CPNPs) were developed for the Cur detection. The CPNPs were synthesized by using adenosine monophosphate (AMP) as bridge ligands via coordination self-assembly with Ce3+ and Tb3+. The AMP-Ce/Tb CPNPs exhibited the characteristic green fluorescence of Tb3+ and had high luminescence efficiency. Under the optimal conditions, the fluorescence intensity of AMP-Ce/Tb CPNPs could be significantly quenched by Cur. The fluorescence quenching extent at λex/λem of 300 nm/544 nm showed a good linear relationship with the Cur concentration in the range of 10 to 1000 nM. The detection limit was as low as 8.0 nM (S/N = 3). This method was successfully applied to the determination of Cur in real samples with satisfactory results. The luminescence mechanism of AMP-Ce/Tb CPNPs and the fluorescence quenching mechanism of the CPNPs by Cur were both examined.
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Affiliation(s)
- Yujie Liu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People's Republic of China
| | - Ran Gao
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People's Republic of China
| | - Xingcen Liu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People's Republic of China
| | - Jinhua Zheng
- Tai'an Center for Disease Control and Prevention, Tai'an, 271000, People's Republic of China
| | - Xia Wu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People's Republic of China.
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Villarino N, Lavilla I, Pena-Pereira F, Bendicho C. Droplet-based luminescent sensor supported onto hydrophobic cellulose substrate for assessing fish freshness following smartphone readout. Food Chem 2023; 424:136475. [PMID: 37269633 DOI: 10.1016/j.foodchem.2023.136475] [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: 01/05/2023] [Revised: 05/16/2023] [Accepted: 05/26/2023] [Indexed: 06/05/2023]
Abstract
In this work, two sensitive droplet-based luminescent assays with smartphone readout for the determination of trimethylamine nitrogen (TMA-N) and total volatile basic nitrogen (TVB-N) are reported. Both assays exploit the luminescence quenching of copper nanoclusters (CuNCs) produced when exposed to volatile nitrogen bases. In addition, hydrophobic-based cellulose substrates demonstrated their suitability as holders for both in-drop volatile enrichment and subsequent smartphone-based digitization of the enriched colloidal solution of CuNCs. Under optimal conditions, enrichment factors of 181 and 153 were obtained with the reported assays for TMA-N and TVB-N, respectively, leading to methodological LODs of 0.11 mg/100 g and 0.27 mg/100 g for TMA-N and TVB-N, respectively. The repeatability, expressed as RSD, was 5.2% and 5.6% for TMA-N and TVB-N, respectively (N = 8). The reported luminescent assays were successfully applied to the analysis of fish samples, showing statistically comparable results to those obtained with the reference methods of analysis.
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Affiliation(s)
- Nerea Villarino
- Centro de Investigación Mariña, Universidade de Vigo, Departamento de Química Analítica e alimentaria, Grupo QA2, Edificio CC Experimentais, Campus de Vigo, As Lagoas, Marcosende, 36310 Vigo, Spain
| | - Isela Lavilla
- Centro de Investigación Mariña, Universidade de Vigo, Departamento de Química Analítica e alimentaria, Grupo QA2, Edificio CC Experimentais, Campus de Vigo, As Lagoas, Marcosende, 36310 Vigo, Spain
| | - Francisco Pena-Pereira
- Centro de Investigación Mariña, Universidade de Vigo, Departamento de Química Analítica e alimentaria, Grupo QA2, Edificio CC Experimentais, Campus de Vigo, As Lagoas, Marcosende, 36310 Vigo, Spain.
| | - Carlos Bendicho
- Centro de Investigación Mariña, Universidade de Vigo, Departamento de Química Analítica e alimentaria, Grupo QA2, Edificio CC Experimentais, Campus de Vigo, As Lagoas, Marcosende, 36310 Vigo, Spain.
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Yuan M, Li M, Su P, Yu L, Lu Y, Sun M, Yuan C, Li M, Wang S. Dual-responsive ratiometric fluorescent sensor for tetracyclines detection based on europium-decorated copper nanoclusters. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 291:122384. [PMID: 36689908 DOI: 10.1016/j.saa.2023.122384] [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: 12/24/2022] [Revised: 01/10/2023] [Accepted: 01/16/2023] [Indexed: 06/17/2023]
Abstract
Development of accurate and efficient TCs residue analysis methods is of great significance for the protection of environment, food safety and public health. Herein, a dual-responsive ratiometric fluorescence sensor being capable of simple and sensitive detection of tetracycline (TC) was presented, which was constructed by immobilizing europium ions (Eu3+) onto the mercaptopropionic acid stabilized copper nanoclusters (MPA-Cu NCs). In the presence of TC, the red fluorescence of Eu3+ was enhanced through antenna effect (AE), while the green fluorescence of MPA-Cu NCs was quenched through internal filter effect (IFE), leading to an obvious fluorescence color evolution from green to red for the probe solution. In addition to successful design of a smartphone-assisted colorimetric analysis platform for portable detection, a logic gate device capable of intelligently monitoring TC concentration is also designed.
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Affiliation(s)
- Mi Yuan
- College of Life Sciences and Technology, College of Informatics, Huazhong Agricultural University, Wuhan 430070, People's Republic of China; Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, People's Republic of China
| | - Mingxuan Li
- College of Life Sciences and Technology, College of Informatics, Huazhong Agricultural University, Wuhan 430070, People's Republic of China
| | - Pengchen Su
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, People's Republic of China
| | - Long Yu
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, People's Republic of China
| | - Yunfei Lu
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, People's Republic of China
| | - Mingtai Sun
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, People's Republic of China
| | - Chao Yuan
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, People's Republic of China.
| | - Mingshun Li
- College of Life Sciences and Technology, College of Informatics, Huazhong Agricultural University, Wuhan 430070, People's Republic of China.
| | - Suhua Wang
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, People's Republic of China.
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Herneisey M, Janjic JM. Multiple Linear Regression Predictive Modeling of Colloidal and Fluorescence Stability of Theranostic Perfluorocarbon Nanoemulsions. Pharmaceutics 2023; 15:1103. [PMID: 37111589 PMCID: PMC10146561 DOI: 10.3390/pharmaceutics15041103] [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: 02/04/2023] [Revised: 03/17/2023] [Accepted: 03/27/2023] [Indexed: 03/31/2023] Open
Abstract
Perfluorocarbon nanoemulsions (PFC-NEs) are widely used as theranostic nanoformulations with fluorescent dyes commonly incorporated for tracking PFC-NEs in tissues and in cells. Here, we demonstrate that PFC-NE fluorescence can be fully stabilized by controlling their composition and colloidal properties. A quality-by-design (QbD) approach was implemented to evaluate the impact of nanoemulsion composition on colloidal and fluorescence stability. A full factorial, 12-run design of experiments was used to study the impact of hydrocarbon concentration and perfluorocarbon type on nanoemulsion colloidal and fluorescence stability. PFC-NEs were produced with four unique PFCs: perfluorooctyl bromide (PFOB), perfluorodecalin (PFD), perfluoro(polyethylene glycol dimethyl ether) oxide (PFPE), and perfluoro-15-crown-5-ether (PCE). Multiple linear regression modeling (MLR) was used to predict nanoemulsion percent diameter change, polydispersity index (PDI), and percent fluorescence signal loss as a function of PFC type and hydrocarbon content. The optimized PFC-NE was loaded with curcumin, a known natural product with wide therapeutic potential. Through MLR-supported optimization, we identified a fluorescent PFC-NE with stable fluorescence that is unaffected by curcumin, which is known to interfere with fluorescent dyes. The presented work demonstrates the utility of MLR in the development and optimization of fluorescent and theranostic PFC nanoemulsions.
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Affiliation(s)
| | - Jelena M. Janjic
- Graduate School of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, PA 15282, USA;
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7
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2-Mercaptobenzothiazole-supported ratiometric fluorescent copper nanoclusters for activatable GSH sensing to drive tumor recognition. Colloids Surf B Biointerfaces 2022. [DOI: 10.1016/j.colsurfb.2022.112698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Li X, Wang X, Guo W, Wang Y, Hua Q, Tang F, Luan F, Tian C, Zhuang X, Zhao L. Selective Detection of Alkaline Phosphatase Activity in Environmental Water Samples by Copper Nanoclusters Doped Lanthanide Coordination Polymer Nanocomposites as the Ratiometric Fluorescent Probe. BIOSENSORS 2022; 12:372. [PMID: 35735520 PMCID: PMC9221544 DOI: 10.3390/bios12060372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Revised: 05/17/2022] [Accepted: 05/27/2022] [Indexed: 06/15/2023]
Abstract
In this paper, a novel, accurate, sensitive and rapid ratiometric fluorescent sensor was fabricated using a copper nanoclusters@infinite coordination polymer (ICP), specifically, terbium ion-guanosine 5'-disodium (Cu NCs@Tb-GMP) nanocomposites as the ratiometric fluorescent probe, to detect alkaline phosphatase (ALP) in water. The fluorescence probe was characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The experimental results showed that, compared with Tb-GMP fluorescent sensors, Cu ratiometric fluorescent sensors based on NCs encapsulated in Tb-GMP had fewer experimental errors and fewer false-positive signals and were more conducive to the sensitive and accurate detection of ALP. In addition, the developed fluorescent probe had good fluorescence intensity, selectivity, repeatability and stability. Under optimized conditions, the ratiometric fluorescent sensor detected ALP in the range of 0.002-2 U mL-1 (R2 = 0.9950) with a limit of detection of 0.002 U mL-1, and the recovery of ALP from water samples was less than 108.2%. These satisfying results proved that the ratiometric fluorescent probe has good application prospects and provides a new method for the detection of ALP in real water samples.
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Affiliation(s)
- Xin Li
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China; (X.L.); (X.W.); (Y.W.); (Q.H.); (F.T.); (F.L.); (C.T.)
| | - Xiaoling Wang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China; (X.L.); (X.W.); (Y.W.); (Q.H.); (F.T.); (F.L.); (C.T.)
| | - Wei Guo
- Shandong Dyne Marine Biopharmaceutical Co., Ltd., Weihai 264300, China
| | - Yunfei Wang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China; (X.L.); (X.W.); (Y.W.); (Q.H.); (F.T.); (F.L.); (C.T.)
| | - Qing Hua
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China; (X.L.); (X.W.); (Y.W.); (Q.H.); (F.T.); (F.L.); (C.T.)
| | - Feiyan Tang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China; (X.L.); (X.W.); (Y.W.); (Q.H.); (F.T.); (F.L.); (C.T.)
| | - Feng Luan
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China; (X.L.); (X.W.); (Y.W.); (Q.H.); (F.T.); (F.L.); (C.T.)
| | - Chunyuan Tian
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China; (X.L.); (X.W.); (Y.W.); (Q.H.); (F.T.); (F.L.); (C.T.)
| | - Xuming Zhuang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China; (X.L.); (X.W.); (Y.W.); (Q.H.); (F.T.); (F.L.); (C.T.)
| | - Lijun Zhao
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China; (X.L.); (X.W.); (Y.W.); (Q.H.); (F.T.); (F.L.); (C.T.)
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Rapid sonochemical synthesis of copper nanoclusters with red fluorescence for highly sensitive detection of silver ions. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107370] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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10
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Fabrication of metallic copper nanoparticles by utilizing a difference in standard electrode potential. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-021-01850-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Li S, Liu D, Wu B, Sun H, Liu X, Zhang H, Ding N, Wu L. One-pot synthesis of a peroxidase-like nanozyme and its application in visual assay for tyrosinase activity. Talanta 2021; 239:123088. [PMID: 34838324 DOI: 10.1016/j.talanta.2021.123088] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 11/18/2021] [Accepted: 11/21/2021] [Indexed: 01/02/2023]
Abstract
Both single-atom nanozymes (SAzymes) and protein-template metal nanoparticles have attracted comprehensive attention in several respects owing to their excellent catalytic performance, green facile synthesis process, and robustness. Herein, the peroxidase-like activity of single-atom copper anchored on bovine hemoglobin-template gadolinium nanoparticles (Cu,Gd@BHbFITC NPs) were successfully synthesized and two sensitive turn-on fluorescence strategies for tyrosinase (TYR) activity sensing were proposed for the first time. For strategy Ⅰ, TYR sensing was carried out from 1.00 to 7.80 U/mL with the detection limit (LOD) of 0.20 U/mL based on the fluorescence resonance energy transfer (FRET) between the fluorescein isothiocyanate (FITC) and the in situ generated polydopamine dots (PDA-dots). For strategy Ⅱ, The LOD of TYR was 0.05 U/mL with the linear range of 0.40-19.70 U/mL based on the elimination of inner-filter effect (IEF) between FITC and the reaction product (RC) of phenol and 4-Aminoantipyrine (AAP). The smartphone-assisted sensing platform was applied to construct the on-site detection of TYR with both strategies. The developed probe possessed good selectivity and was successfully utilized to TYR detection in serum samples.
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Affiliation(s)
- Shuangqin Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Di Liu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Bingyan Wu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Huipeng Sun
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Xiaoyan Liu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Haixia Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China.
| | - Nana Ding
- College of Chemical Engineering, Northwest Minzu University, Lanzhou, Gansu, 730030, China
| | - Lan Wu
- College of Chemical Engineering, Northwest Minzu University, Lanzhou, Gansu, 730030, China.
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Fluorometry detection for trypsin via inner filter effect between cytochrome C and in-situ formed fluorescent thiochrome. Talanta 2021; 234:122614. [PMID: 34364423 DOI: 10.1016/j.talanta.2021.122614] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 06/09/2021] [Accepted: 06/11/2021] [Indexed: 11/21/2022]
Abstract
A fluorometry assay for trypsin sensitive determination has been presented. The fluorescence of the system at 370/445 nm is derived from thiochrome obtained by in-situ oxidation of thiamine. Based on the inner filter effect, cytochrome C (Cyt C) can quench the fluorescence at 445 nm effectively. Cyt C is specifically hydrolyzed by trypsin through an enzymatic reaction, giving rise to the enhancement of the fluorescence intensity. The change value of fluorescence intensity is proportional to trypsin concentration, which is successfully used for trypsin quantitative detection. This method exhibits good repeatability and selectivity with a detection limit of 0.15 μg mL-1 and a quantification limit of 0.50 μg mL-1 for trypsin sensing. Moreover, it is applied to detect trypsin in practical serum and urine samples with accurate results. The proposed assay is not only a promising candidate for trypsin determination in practical application but also a potentially valuable tool in urine comprehensive analysis and disease diagnosis.
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