玉米低聚肽中焦谷氨酰亮氨酸(pEL)二肽的研究

考察了玉米低聚肽的理化组成成分,由于制备玉米低聚肽的原料玉米蛋白氨基酸序列独特,含有较多的谷氨酰胺及亮氨酸,且大多以相邻的位置存在,研究重点考察了玉米低聚肽中具有抗抑郁活性的肽段焦谷氨酰亮氨酸(pyroGlu-Leu,pEL)二肽结构.结果表明,玉米低聚肽蛋白含量高,干基蛋白含量为87.70％,肽含量为82.76％,平...

Study on pEL dipeptide in corn oligopeptides

The physical and chemical composition of corn oligopeptides was investigated in this study.Due to the unique amino acid sequence of corn protein which with high amount of glutamine and leucine and exist in adjacent positions,this study also focused on the pyroglutamyl-leucine(pyroGlu-Leu,pEL)dipeptide structure with antidepressant activity from corn oligopeptide.The results showed that corn oligopeptide had high protein content which reached 87.70%,and the peptide content was 82.76%.The average molecular weight was 461.20 Da and mainly in the range of 140-1000 Da.The highest content of all amino acids was glutamic acid(glutamine)which reached 21.76%,followed by leucine with a content of 12.79%and leucine was the highest essential amino acid.The results of structural studies indicated that the content of pEL was more than 0.58%in corn oligopeptides,and it was stable in five batches of corn oligopeptide samples.This research provides a theoretical basis for developing corn oligopeptide as a new functional food.