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基于LC-MS/MS的食物蛋白质消化组学的研究
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摘要
蛋白质是食物的最主要组成部分之一,蛋白质进入人体后在消化酶的作用下被降解为肽和氨基酸,一些肽段已被证明具有抗菌、降血压等促进人体健康的作用。研究食物蛋白质在人体消化系统中的变化规律及生物活性特点,对于食物蛋白选择、食品加工等具有重要的意义。本研究建立了基于LC-MS/MS的模拟消化模型,利用LCMS/MS研究食物蛋白质在人体消化系统中的变化规律,以靶向性生物活性为指标,研究食物蛋白质在人体消化系统中产生肽及其活性的相关性,在此基础上实现生物活性肽的快速筛选。利用基于LC-MS/MS的模拟消化模型,分别研究了酸奶、牛奶、鹿茸等食源性蛋白质的消化组学。酸奶消化组学的研究揭示了酸奶内源性肽及消化产生肽的ACE和DPP-Ⅳ活性,通过肽与其母体蛋白的相关性研究揭示了肽丰度与菌种的相关性。利用Ti-IMAC技术研究了牛奶中磷酸蛋白的消化组学,揭示了酪蛋白磷酸肽在消化体系的变化规律。鹿茸的消化组学研究结果表明,鹿茸中胶原蛋白是活性肽的主要供体,鹿茸水提物的改善记忆力的功效与其消化过程中产生的PEP抑制肽密切相关。
Proteins,the main component of food,are degraded into peptides and amino acids in the action of digestive enzymes in gastrointestinal tract.Some of the peptides have been proved multiple health-promoting activities,such as antimicrobial,hypotensive,and so on.It' s important for food processing to investigate thebioactivity of food proteins in gastrointestinal tract.In this study,food protein digestomics was investigatedby peptide profile identified using LC-MS/MSand in vitro bioactivityin simulated gastrointestinal tract.Food protein digestomicsof yogurt,milk and deer antler velvetwere investigated using this model.The results of yoghurt showed that endogenous peptides and peptides generated in gastrointestinal tract possessed the ACE and DPP-IV inhibitory activities.Simultaneously,the parent proteins of peptides revealed the relationship of peptides' abundance and microbial strain.The casein phosphopeptidesof milk in gastrointestinal tract were enriched by TiIMAC and the digestomics of casein phosphopeptideswas investigated by LC-MS/MS.Deer antler velvet is functional food in China for a long history.The protein digestomics of deer antler velvet was investigated by LC-MS/MS in simulated gastrointestinal tract.The results showed that collagens were the main protein to release bioactive peptides in gastrointestinal tract.The prolyl endopeptidase inhibitory peptides derived from antler velvet might have positive effect on memory improvement.
引文

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