1
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Improved sensitivity of gold nanoclusters toward trypsin under synergistic adsorption of CdTe quantum dots. Microchem J 2023. [DOI: 10.1016/j.microc.2023.108457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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2
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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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3
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Black phosphorus nanosheets based sensitive protease detection and inhibitor screening. Talanta 2019; 197:270-276. [PMID: 30771934 DOI: 10.1016/j.talanta.2019.01.023] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 01/01/2019] [Accepted: 01/05/2019] [Indexed: 02/06/2023]
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4
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Abstract
Proteases play a pivotal role in regulating important physiological processes from food digestion to blood clotting. They are also important biomarkers for many diseases such as cancers. The importance of proteases has led to extensive efforts in the screening of proteases and their inhibitors as potential drug molecules. For example, human immunodeficiency virus (HIV) patients have been treated with HIV-1 protease inhibitors to prolong the life expectancy of patients. Such a close relationship between diseases and proteases provides a strong motivation for developing sensitive, selective, and robust protease assays and sensors, which can be exploited to discover new proteases and inhibitors. In this aspect, protease assays based on levels of proteolytic activities are more relevant than protease affinity assays such as immunoassays. In this review, recent developments of protease activity assays based on different detection principles are discussed and compared. For homogenous assays, fluorescence-based techniques are the most popular due to their high sensitivity and quantitative results. However, homogeneous assays have limited multiplex sensing capabilities. In contrast, heterogeneous assays can be employed to detect multiple proteases simultaneously, given the microarray technology that is already available. Among them, electrochemical methods, surface spectroscopy techniques, and enzyme-linked peptide protease assays are commonly used. Finally, recent developments in liquid crystal (LC)-based protease assays and their applications for detecting proteases and their inhibitors are discussed.
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Affiliation(s)
| | - Kun-Lin Yang
- National University of Singapore, 4 Engineering Drive 4, Singapore 117585.
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5
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Xue F, Qu F, Han W, Xia L, You J. Aggregation-induced emission enhancement of gold nanoclusters triggered by silicon nanoparticles for ratiometric detection of protamine and trypsin. Anal Chim Acta 2018; 1046:170-178. [PMID: 30482296 DOI: 10.1016/j.aca.2018.09.033] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 09/12/2018] [Accepted: 09/17/2018] [Indexed: 12/21/2022]
Abstract
Metal nanoclusters protected by glutathione (GSH) have attracted a wide attention due to the unique aggregation-induced emission (AIE) feature. However, the "trigger" effects of ethanol, temperature, pH values, and metal ions may restrict the application of these particles. In this work, the amino modified silicon nanoparticles (SiNPs) and GSH-capped gold nanoclusters (GSH-AuNCs) can self-assemble into well-defined spherical particles due to the electrostatic interaction. As a result, the unique aggregation-induced emission enhancement (AIEE) of GSH-AuNCs arises at 570 nm, and the SiNPs keep their own blue fluorescence at 450 nm, so a novel nanohybrid probe (SiNPs@GSH-AuNCs) with dual-emission property has been constructed. When protamine is added to SiNPs@GSH-AuNCs, the cationic protamine can compete with SiNPs and absorb onto the surface of GSH-AuNCs, which inhibits the self-assembly and leads to the fluorescence quenching of GSH-AuNCs; while trypsin can catalyze the hydrolysis of protamine, the self-assembly starts again, producing the AIEE recovery. In the whole process, the SiNPs act as an internal standard and their emission stays constant. By means of the fluorescence intensity ratios I570/I450, the linear range of protamine is from 0.15 to 3.00 μg mL-1 with the limit of detection (LOD) of 0.07 μg mL-1, and trypsin shows a linear response in the range from 10 to 100 ng mL-1 with LOD of 4.50 ng mL-1. Furthermore, this strategy exhibits good sensitivity and selectivity, and has been further validated by applying it for the determination of protamine and trypsin in serum samples.
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Affiliation(s)
- Fangfang Xue
- The Key Laboratory of Life-Organic Analysis, Qufu Normal University, Qufu, 273165, Shandong, China; Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Fei Qu
- The Key Laboratory of Life-Organic Analysis, Qufu Normal University, Qufu, 273165, Shandong, China; Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu, 273165, Shandong, China.
| | - Wenli Han
- Laboratory Animal Center, Chongqing Medical University, Chongqing, China
| | - Lian Xia
- The Key Laboratory of Life-Organic Analysis, Qufu Normal University, Qufu, 273165, Shandong, China; Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Jinmao You
- The Key Laboratory of Life-Organic Analysis, Qufu Normal University, Qufu, 273165, Shandong, China; Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu, 273165, Shandong, China; Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, 810001, China
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6
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Tan Q, Zhang R, Kong W, Qu F, Lu L. Ascorbic Acid-Loaded Apoferritin-Assisted Carbon Dot-MnO2 Nanocomposites for the Selective and Sensitive Detection of Trypsin. ACS APPLIED BIO MATERIALS 2018; 1:777-782. [DOI: 10.1021/acsabm.8b00235] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qingqing Tan
- College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People’s Republic of China
| | - Ruirui Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Weisu Kong
- College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People’s Republic of China
| | - Fengli Qu
- College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People’s Republic of China
| | - Limin Lu
- Institute of Functional Materials and Agricultural Applied Chemistry, College of Science, Jiangxi Agricultural University, Nanchang 330045, People’s Republic of China
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7
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Sato D, Kondo T, Kato T. Dual emissive bispyrene peptide probes for highly sensitive measurements of trypsin activity and evaluation of trypsin inhibitors. Bioorg Med Chem 2018; 26:3468-3473. [DOI: 10.1016/j.bmc.2018.05.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 05/11/2018] [Accepted: 05/15/2018] [Indexed: 01/15/2023]
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8
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Zhang S, Chen C, Qin X, Zhang Q, Liu J, Zhu J, Gao Y, Li L, Huang W. Ultrasensitive detection of trypsin activity and inhibitor screening based on the electron transfer between phosphorescence copper nanocluster and cytochrome c. Talanta 2018; 189:92-99. [PMID: 30086981 DOI: 10.1016/j.talanta.2018.06.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 05/30/2018] [Accepted: 06/09/2018] [Indexed: 11/19/2022]
Abstract
Trypsin, as one of important proteases, is specific for catalyzing the hydrolysis of peptide and ester bonds containing lysine and arginine residues at the C-terminus. The level of trypsin in biological fluids can serve as a reliable and specific diagnostic biomarker for pancreatic function and its pathological changes. Herein, we demonstrate the application of phosphorescent Cu NCs for trypsin detection for the first time depending on the electron transfer between Cu NCs and cyt c. Cyt c and Cu NCs were selected as the quencher and the fluorophore, respectively. Cu NCs could bind to the positively charged cyt c through electrostatic and hydrophobic interactions, and the phosphorescence of Cu NCs was efficiently quenched by the metal-containing heme of cyt c. In the presence of trypsin, cyt c was digested, thus phosphorescence of Cu NCs remained. Therefore, a new and continuous phosphorescence assay for the detection of trypsin activity and its inhibitor screening was established. The plot of relative fluorescence versus trypsin concentration obtains a good linear detection range from 0 to 20 ng/mL (R2 = 0.9657), and a detection limit of 2 ng/mL, which is much lower than 20 ng/mL of the sensor in buffer solution because of urine amplifying the phosphorescence signal of Cu NCs based on the FRET strategy. This assay still has been successfully applied to trypsin inhibitor screening, demonstrating its potential application in drug discovery.
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Affiliation(s)
- Shiyu Zhang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Can Chen
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Xiaofei Qin
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Qianchen Zhang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Jinhua Liu
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China; State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China.
| | - Jixin Zhu
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Yongqian Gao
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Lin Li
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China; Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an 710072, China
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9
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Silver triangular nanoplates as an high efficiently FRET donor-acceptor of upconversion nanoparticles for ultrasensitive "Turn on-off" protamine and trypsin sensor. Talanta 2017; 174:148-155. [PMID: 28738561 DOI: 10.1016/j.talanta.2017.06.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 05/31/2017] [Accepted: 06/02/2017] [Indexed: 02/01/2023]
Abstract
Silver triangular nanoplates (STNPs) as a high efficient fluorescence quenching reagent of upconversion nanoparticles (UCNPs) was used to constract a novel label-free fluorescence nanosensor for ultrasensitive detection of protamine and trypsin based on fluorescence resonance energy transfer (FRET) between STNPs and UCNPs. In this assay, the negatively charged STNPs can bind with positively charged UCNPs through electrostatic interaction, and then quenched the fluorescence of UCNPs. When protamine was added to the mixture of UCNPs-STNPs, the STNPs interacted with protamine and then detached from the surface of UCNPs and aggregated, which result in the recovery of the fluorescence of UCNPs. Trypsin could catalyze the hydrolysis of protamine and effectively quench the fluorescence recovered by protamine. By measuring the changes of the fluorescence of UCNPs, the concentrations of protamine and trypsin were determined. Under the optimized conditions, the linear response range was obtained from 10 to 500ng/mL, 5-80ng/mL and with the low detection limit of 3.1ng/mL and 1.8ng/mL for protamine and trypsin, respectively. Meanwhile, the nanosensor shows good selectivity, sensitivity and can be successfully applied to detection of protamine and trypsin in serum samples.
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10
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Wang F, Gao J, Zhao J, Zhang W, Bai J, Jia H, Wang Y. A new two-mode fluorescence signal amplification strategy for protease activity assay based on graphene oxide. RSC Adv 2017. [DOI: 10.1039/c7ra08166a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new graphene oxide-based two-mode fluorescence signal amplification strategy for the detection of protease activity has been established.
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Affiliation(s)
- Fangfang Wang
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education
- Key Laboratory of Analytical Science and Technology of Hebei Province
- College of Chemistry and Environment Science
- Hebei University
- Baoding
| | - Jie Gao
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education
- Key Laboratory of Analytical Science and Technology of Hebei Province
- College of Chemistry and Environment Science
- Hebei University
- Baoding
| | - Jianwei Zhao
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education
- Key Laboratory of Analytical Science and Technology of Hebei Province
- College of Chemistry and Environment Science
- Hebei University
- Baoding
| | - Wenyue Zhang
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education
- Key Laboratory of Analytical Science and Technology of Hebei Province
- College of Chemistry and Environment Science
- Hebei University
- Baoding
| | - Jie Bai
- Medical Comprehensive Experimental Center
- Hebei University
- Baoding
- P. R. China
| | - Hongxia Jia
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education
- Key Laboratory of Analytical Science and Technology of Hebei Province
- College of Chemistry and Environment Science
- Hebei University
- Baoding
| | - Yucong Wang
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education
- Key Laboratory of Analytical Science and Technology of Hebei Province
- College of Chemistry and Environment Science
- Hebei University
- Baoding
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11
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Liu W, Li H, Wei Y, Dong C. A label-free phosphorescence sensing platform for trypsin based on Mn-ZnS QDs. RSC Adv 2017. [DOI: 10.1039/c7ra03349d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A label-free phosphorescence strategy to determine trypsin was proposed using Mn-ZnS QDs as the phosphorescence probe with a better validity.
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Affiliation(s)
- Wei Liu
- Institute of Environmental Science
- Shanxi University
- Taiyuan
- P. R. China
- College of Environmental & Resource Sciences
| | - Huanhuan Li
- Institute of Environmental Science
- Shanxi University
- Taiyuan
- P. R. China
| | - Yanli Wei
- Institute of Environmental Science
- Shanxi University
- Taiyuan
- P. R. China
| | - Chuan Dong
- Institute of Environmental Science
- Shanxi University
- Taiyuan
- P. R. China
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12
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Zhang L, Qin H, Cui W, Zhou Y, Du J. Label–free, turn–on fluorescent sensor for trypsin activity assay and inhibitor screening. Talanta 2016; 161:535-540. [DOI: 10.1016/j.talanta.2016.09.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 08/26/2016] [Accepted: 09/03/2016] [Indexed: 10/21/2022]
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13
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Zhang L, Du J. A sensitive and label-free trypsin colorimetric sensor with cytochrome c as a substrate. Biosens Bioelectron 2015; 79:347-52. [PMID: 26724537 DOI: 10.1016/j.bios.2015.12.070] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 12/04/2015] [Accepted: 12/20/2015] [Indexed: 11/17/2022]
Abstract
The development of simple and sensitive methods for protease sensing plays important roles in clinical diagnostics and drug development. Here a simple, rapid, label-free, and sensitive trypsin colorimetric sensor was developed by employing cytochrome c (cyt c) as an enzyme substrate and 3,3´,5,5´-tetramethylbenzidine (TMB) as a chromogenic reagent. It was found that cyt c hardly catalyzes H2O2-mediated TMB oxidation to produce a blue solution. But the hydrolysate of cyt c by trypsin displays an intense catalytic effect on the aforementioned reaction, resulting in the formation of a blue solution immediately. The detection process allows visually perceiving as low as 50 ng/mL trypsin with the naked eyes. With the aid of a spectrophotometer, the absorbance at 652 nm was proportional to the concentration of trypsin in the range from 5.0 ng/mL to 2.0 μg/mL with a detection limit of 4.5 ng/mL. The sensor showed better precision with relative standard deviation of 2.5% and 1.7% for eleven repetitive measurements of 50.0 ng/mL and 1.0 μg/mL trypsin solution, respectively. The procedure has been successfully applied to the determination of trypsin in human urines and for inhibitor screening, demonstrating its potential application in clinic diagnosis and drug development.
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Affiliation(s)
- Lufeng Zhang
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, China
| | - Jianxiu Du
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, China.
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14
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Ou LJ, Li XY, Li LJ, Liu HW, Sun AM, Liu KJ. A sensitive assay for trypsin using poly(thymine)-templated copper nanoparticles as fluorescent probes. Analyst 2015; 140:1871-5. [PMID: 25657995 DOI: 10.1039/c4an01994f] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A new, simple and sensitive fluorescence strategy was developed for the trypsin assay based on copper nanoparticles (CuNPs) and its different fluorescence response toward trypsin-catalyzed hydrolysis of cytochrome c (Cyt c). Polythymine (poly T)-templated CuNPs served as effective fluorescent probes. Cyt c is well-known to act as a quencher. However, herein, a low concentration of Cyt c was designed specially to act as the substrate of trypsin to avoid the quenching effects by electron transfer from Cyt c to CuNPs. In the presence of trypsin, Cyt c hydrolyzes to small peptides, releasing free cysteine residues. Nonfluorescent coordination complexes were formed upon exposure to free cysteine residues by a metal-ligand bond between Cu atoms and sulfur atoms, leading to a decreased fluorescence response to CuNPs. This novel method for the quantitative determination of trypsin has a linear detection range from 0.25 μg mL(-1) to 1000 μg mL(-1) and a relatively low detection limit of 42 ng mL(-1). To the best of our knowledge, this is the first application of the trypsin-catalyzed hydrolysis reaction of Cyt c to produce quenching effect in bioanalysis, which provided a novel approach for the biochemical sensing strategy.
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Affiliation(s)
- Li-Juan Ou
- College of Material and Chemical Engineering, Hunan Institute of Technology, Hengyang 421002, P. R. China.
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15
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You X, Li Y, Li B, Ma J. Gold nanoclusters-based chemiluminescence resonance energy transfer method for sensitive and label-free detection of trypsin. Talanta 2015; 147:63-8. [PMID: 26592577 DOI: 10.1016/j.talanta.2015.09.033] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2015] [Revised: 09/09/2015] [Accepted: 09/12/2015] [Indexed: 01/03/2023]
Abstract
A chemiluminescence resonance energy transfer (CRET) platform was developed for sensitive and label-free detection of protease by using trypsin as a model analyte. In this CRET platform, bis(2,4,6-trichlorophenyl)oxalate-hydrogen peroxide chemiluminescence (CL) reaction was utilized as an energy donor and bovine serum albumin (BSA)-stabilized gold nanoclusters (Au NCs) as an energy acceptor. The BSA-stabilized Au NCs triggered the CRET phenomenon by accepting the energy from TCPO-H2O2 CL reaction, thus producing intense CL. In the presence of trypsin, the protein template of BSA-stabilized Au NCs was digested, which frustrated the energy transfer efficiency between the CL donor and the BSA-stabilized Au NCs, leading to a significant decrease in the CL signal. The decreased CL signal was proportional to the logarithm of trypsin concentration in the range of 0.01-50.0µg mL(-1). The detection limit for trypsin was 9ng mL(-)(1) and the relative standard deviations were lesser than 3% (n=11). This Au NCs-based CRET platform was successfully applied to the determination of trypsin in human urine samples, demonstrating its potential application in clinical diagnosis.
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Affiliation(s)
- Xiaoying You
- Department of Chemistry, School of Science, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yinhuan Li
- Department of Chemistry, School of Science, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Baoping Li
- Department of Chemistry, School of Science, Xi'an Jiaotong University, Xi'an 710049, China
| | - Jie Ma
- Department of Genetics and Molecular Biology, School of Medicine, Xi'an Jiaotong University, Xi'an 710049, China
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16
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Tang B, Yang Y, Wang G, Yao Z, Zhang L, Wu HC. A simple fluorescent probe based on a pyrene derivative for rapid detection of protamine and monitoring of trypsin activity. Org Biomol Chem 2015; 13:8708-12. [PMID: 26178260 DOI: 10.1039/c5ob01034a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We report the synthesis of a simple pyrene derivative and its application in protamine detection and monitoring of trypsin activity. This assay can be conducted in aqueous solution and features rapid response, visual detection, high sensitivity and selectivity. The limit of detection of protamine was 0.5 μg mL(-1). The IC50 value of a soybean trypsin inhibitor was estimated to be 0.51 U mL(-1).
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Affiliation(s)
- Baiyang Tang
- Key Laboratory for Biomedical Effects of Nanomaterials & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
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17
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Zhang H, Yu D, Zhao Y, Fan A. Turn-on chemiluminescent sensing platform for label-free protease detection using streptavidin-modified magnetic beads. Biosens Bioelectron 2014; 61:45-50. [DOI: 10.1016/j.bios.2014.04.050] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 04/18/2014] [Accepted: 04/26/2014] [Indexed: 11/24/2022]
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18
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Liang RP, Tian XC, Qiu P, Qiu JD. Multiplexed electrochemical detection of trypsin and chymotrypsin based on distinguishable signal nanoprobes. Anal Chem 2014; 86:9256-63. [PMID: 25145572 DOI: 10.1021/ac502318x] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In this work, we developed a novel multisignal output for simultaneous detection of multiple proteases by using nanoprobes labeled with distinguishable electrochemical probes. First, biotinylated peptide1 (S1) and biotinylated peptide2 (S2) were associated with biotinylated DNA1 and DNA2 via biotin-streptavidin interaction, forming DNA1-S1 and DNA2-S2, respectively. Two distinguishable signal nanoprobes (DNA1'-Au NPs-Thi and DNA2'-Au NPs-Fc) were prepared by initial assembling DNA1' and DNA2' on the Au NPs surface, respectively, and then carrying corresponding thionine (Thi) and 6-(Ferrocenyl)hexanethiol (Fc). Then, the peptide substrates (DNA1-S1 and DNA2-S2) were immobilized on gold electrode surface through Au-S bonds, and the DNA1'-Au NPs-Thi and DNA2'-Au NPs-Fc were assembled to the peptide-DNA-modified electrode surface via DNA hybridization. The targets of trypsin and chymotrypsin can specifically recognize and cleave peptides with different sequences, releasing DNA1'-Au NPs-Thi and DNA2'-Au NPs-Fc from the electrode surface into solution, thus decreasing the current of Thi and Fc. The decrease in the electrochemical currents of the two signal nanoprobes enables us to simultaneously and quantitatively determine the targets trypsin and chymotrypsin. More importantly, this strategy can be extended easily by designing various proteases-specific peptide substrates and utilizing corresponding electrochemical detectable elements for simultaneous multiplex protease assay in various biosystems.
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Affiliation(s)
- Ru-Ping Liang
- Department of Chemistry, Nanchang University , Nanchang 330031 People's Republic of China
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19
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He Y, Jiao B. An ultrasensitive fluorometric platform for S1 nuclease assay based on cytochrome c. RSC Adv 2014. [DOI: 10.1039/c4ra05088f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An ultrasensitive and straightforward fluorescent sensing platform for S1 nuclease activity has been developed based on cytochrome c.
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Affiliation(s)
- Yue He
- Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing)
- Ministry of Agriculture
- Citrus Research Institute
- Southwest University
- Chongqing, China
| | - Bining Jiao
- Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing)
- Ministry of Agriculture
- Citrus Research Institute
- Southwest University
- Chongqing, China
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