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Zhao L, Gao P, Zhang Y, Wang X, Lu S, Yue C, Bai C, Wu W, Zhang Y, Zhao Z. Measurement of degree of hydrolysis and molecular weight distribution of protein hydrolysates by liquid chromatography-mass spectrometry. Talanta 2024; 268:125347. [PMID: 37913595 DOI: 10.1016/j.talanta.2023.125347] [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: 09/15/2023] [Revised: 10/23/2023] [Accepted: 10/25/2023] [Indexed: 11/03/2023]
Abstract
Enzymatic hydrolysis of milk protein is an effective way to improve protein digestibility, to reduce their allergenicity and to produce peptides with better functionalities. Among the process, the degree of hydrolysis (DH) and molecular weight distribution (MWD) of protein hydrolysates are two important parameters that need to be monitored. In this work, a new method based on liquid chromatography-mass spectrometry (LC-MS) was developed for the first time to accurately detect the DH and the MWD of proteolytic peptides. With LC-MS, the content of free amine groups released during hydrolysis was acquired by direct analysis of free trinitrobenzene sulfonic acid (TNBS) for DH assay, overcoming the disadvantage of TNBS-based spectral method. Based on this method, the DH% values of five protein hydrolysis samples were determined and consistent with file specification values. Compared to the size-exclusion high-performance liquid chromatography (SE-HPLC) method, LC-MS was capable of measuring MWD (similar results with file specification values) while additionally providing precise molecular weight and amino acid sequence information for each proteolytic peptide. This method was characterized by its simplicity, accuracy, and reproducibility, making it a valuable technology for monitoring proteolysis and producing peptides with better functionality.
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Affiliation(s)
- Lingyu Zhao
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Beijing Mass Spectrum Center, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, China; Graduate School, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Peng Gao
- Heilongjiang Feihe Dairy Co., Ltd, Beijing, 100016, China.
| | - Yuanyuan Zhang
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Beijing Mass Spectrum Center, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, China
| | - Xiangxin Wang
- Heilongjiang Feihe Dairy Co., Ltd, Beijing, 100016, China
| | - Siyu Lu
- Heilongjiang Feihe Dairy Co., Ltd, Beijing, 100016, China
| | - Chunlin Yue
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Beijing Mass Spectrum Center, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, China; Graduate School, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chengling Bai
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Beijing Mass Spectrum Center, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, China; Graduate School, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Wenjing Wu
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Beijing Mass Spectrum Center, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, China; Graduate School, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yangyang Zhang
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Beijing Mass Spectrum Center, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, China; Graduate School, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhenwen Zhao
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Beijing Mass Spectrum Center, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, China; Graduate School, University of Chinese Academy of Sciences, Beijing, 100049, China.
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