4.7 Article

Peptidomic Characterization and Amino Acid Availability after Intake of Casein vs. a Casein Hydrolysate in a Pig Model

期刊

NUTRIENTS
卷 15, 期 5, 页码 -

出版社

MDPI
DOI: 10.3390/nu15051065

关键词

casein; hydrolysate; duodenal digest; peptidomics; digestion kinetics

向作者/读者索取更多资源

It is known that casein hydrolysis accelerates gastrointestinal transit, but its effect on the composition of digests is not fully understood. This study aims to characterize duodenal digests from pigs fed with micellar casein and casein hydrolysate at the peptidome level. The digests from casein contained a wider range and more peptides compared to the hydrolysate. The peptide profile was different, with more opioid sequences found in the casein digests. Plasma amino acid levels were higher in animals fed with the hydrolysate at short times. Discriminant analysis tools were used to identify sequence differences between the substrates for future studies.
It is known that casein hydrolysis accelerates gastrointestinal transit in comparison to intact casein, although the effect of the protein hydrolysis on the composition of the digests is not fully understood. The aim of this work is to characterize, at the peptidome level, duodenal digests from pigs, as a model of human digestion, fed with micellar casein and a previously described casein hydrolysate. In addition, in parallel experiments, plasma amino acid levels were quantified. A slower transit of nitrogen to the duodenum was found when the animals received micellar casein. Duodenal digests from casein contained a wider range of peptide sizes and a higher number of peptides above five amino acids long in comparison with the digests from the hydrolysate. The peptide profile was markedly different, and although beta-casomorphin-7 precursors were also found in hydrolysate samples, other opioid sequences were more abundant in the casein digests. Within the same substrate, the evolution of the peptide pattern at different time points showed minimal changes, suggesting that the protein degradation rate relies more on the gastrointestinal location than on digestion time. Higher plasma concentrations of methionine, valine, lysine and amino acid metabolites were found in animals fed with the hydrolysate at short times (<200 min). The duodenal peptide profiles were evaluated with discriminant analysis tools specific for peptidomics to identify sequence differences between both substrates that can be used for future human physiological and metabolic studies.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据