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Gao S, Li R, Tai W, Song P, Hu Q, Yu L. Microsyringe-assisted visual volume detection based on phase separation: the case of chymosin milk-clotting activity study. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:5105-5111. [PMID: 38993036 DOI: 10.1039/d4ay00670d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/13/2024]
Abstract
The constantly diverse demand scenarios for rapid on-site analysis have put forward high requirements for developing low-cost and user-friendly visual detection methods. Therefore, developing a visual detection method with simple operation and intuitive results has important practical value in the field of analysis and detection, but it is also challenging. In this work, we propose a microsyringe-assisted visual volume detection method based on phase separation, and apply it to analyze the milk-clotting activity of chymosin. Chymosin can cause phase separation of milk with whey in the mobile phase and curd in the gel state. The network structures of casein in curd can trap water molecules, resulting in separation of whey from curd gradually. Therefore, the analysis of chymosin milk-clotting activity can be realized according to the volume of whey measured using a portable microsyringe. This method shows a good linear correlation when the concentration of chymosin ranges from 1.02 U L-1 to 1020 U L-1 and the limit of detection of this method for chymosin is calculated to be 0.03 U mL-1. This work successfully realizes the visual analysis of chymosin milk-clotting activity based on the enzyme-triggered phase separation. It also shows great promise to be applied in other phase separation-based detection systems with the advantages of high accuracy, great portability and user-friendliness.
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Affiliation(s)
- Shan Gao
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, China.
| | - Ruotong Li
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, China.
| | - Wenjun Tai
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, China.
| | - Ping Song
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Qiongzheng Hu
- Qilu University of Technology (Shandong Academy of Sciences), Shandong Analysis and Test Center, Jinan, 250014, China.
- School of Pharmaceutical Sciences, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, China
| | - Li Yu
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, China.
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Spatial-temporal mapping of the intra-gastric pepsin concentration and proteolysis in pigs fed egg white gels. Food Chem 2022; 389:133132. [PMID: 35526282 DOI: 10.1016/j.foodchem.2022.133132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 04/07/2022] [Accepted: 04/29/2022] [Indexed: 11/21/2022]
Abstract
While there is a consensus that food structure affects food digestion, the underlying mechanisms remain poorly understood. A previous experiment in pigs fed egg white gels of same composition but different structures evidenced such effect on food gastric disintegration. In this study, we detailed the consequences on intra-gastric pH, pepsin concentration and proteolysis by sampling throughout the stomach over 6 h digestion. Subsequent amino acid absorption was investigated as well by blood sampling. While acidification was almost homogeneous after 6 h digestion regardless of the gel, pepsin distribution never became uniform. Pepsin started to accumulate in the pylorus/antrum region before concentrating in the body stomach beyond 4 h, time from which proteolysis really started. Interestingly, the more acidic and soft gel resulted in a soon (60 min) increase in proteolysis, an earlier and more intense peak of plasmatic amino acids, and a final pepsin concentration three times higher than with the other gels.
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Li CP, Liu F, Zheng J, Zhao H. A novel electrochemical assay for chymosin determination using a label-free peptide as a substrate. J Dairy Sci 2021; 104:2511-2519. [PMID: 33455776 DOI: 10.3168/jds.2020-19282] [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: 07/13/2020] [Accepted: 10/26/2020] [Indexed: 11/19/2022]
Abstract
Chymosin is a predominant enzyme in rennet and is used in cheese production because of its excellent milk-clotting activity. Herein, we proposed a facile and label-free electrochemical method for determining chymosin activity based on a peptide-based enzyme substrate. The synthesized substrate peptide for chymosin was assembled onto the surface of the Au-deposited grassy carbon electrode. The current was proportional to chymosin activity, and thus chymosin activity could be determined. The detection ranges of chymosin activity were 2.5 to 25 U mL-1. The detection limit of chymosin activity was 0.8 U mL-1. The sensing platform was used to quantify chymosin activity in commercial rennet with high selectivity, excellent stability, and satisfactory reproducibility. We developed a facile, fast, and effective electrochemical assay for detecting chymosin activity, which has potential applications in cheesemaking.
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Affiliation(s)
- Can-Peng Li
- School of Chemical Science and Technology, Key Laboratory of Medicinal Chemistry for Natural Resource-Ministry of Education, Yunnan University, 2 North Cuihu Road, Kunming 650091, People's Republic of China.
| | - Feng Liu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, 2 North Cuihu Road, Kunming 650091, People's Republic of China
| | - Jing Zheng
- School of Chemical Science and Technology, Key Laboratory of Medicinal Chemistry for Natural Resource-Ministry of Education, Yunnan University, 2 North Cuihu Road, Kunming 650091, People's Republic of China
| | - Hui Zhao
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, 2 North Cuihu Road, Kunming 650091, People's Republic of China.
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Nhari RR, Hanish I, Mokhtar NK, Hamid M, El Sheikha A. Authentication approach using enzyme-linked immunosorbent assay for detection of porcine substances. QUALITY ASSURANCE AND SAFETY OF CROPS & FOODS 2019. [DOI: 10.3920/qas2018.1415] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- R.M.H. Raja Nhari
- Laboratory of Halal Science Research, Halal Products Research Institute, Putra Infoport, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - I. Hanish
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - N.F. Khairil Mokhtar
- Laboratory of Halal Science Research, Halal Products Research Institute, Putra Infoport, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - M. Hamid
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - A.F. El Sheikha
- Jiangxi Agricultural University, 1101 Zhimin Road, Nanchang 330045, China
- Bioengineering and Technological Research Centre for Edible and Medicinal Fungi, Jiangxi Agricultural University, 1101 Zhimin Road, Nanchang 330045, China
- Jiangxi Key Laboratory for Conservation and Utilization of Fungal Resources, Jiangxi Agricultural University, 1101 Zhimin Road, Nanchang 330045, China
- Department of Biology, McMaster University, 1280 Main St. West, Hamilton, Ontario, L8S 4K1, Canada
- Department of Food Science and Technology, Faculty of Agriculture, Minufiya University, 32511 Shibin El Kom, Minufiya Government, Egypt
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Rolet-Répécaud O, Arnould C, Dupont D, Gavoye S, Beuvier E, Achilleos C. Quantification of pepsin in rennet using a monoclonal antibody-based inhibition ELISA. Lebensm Wiss Technol 2017. [DOI: 10.1016/j.lwt.2016.10.059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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