分子量段一般在1000道尔顿以下，也称作小肽，寡肽、低聚肽或称为小分子活性肽，小肽一般是指由2－3个氨基酸组成的寡肽，平均分子量约300道尔顿。蛋白质（胶原蛋白）在消化道中的消化终产物往往大部分是小肽而非游离氨基酸，小肽能完整地被吸收并以二、三肽形式进入血液循环，小肽在蛋白质营养中有着重要的作用。
Conclusion Under the optimized fermentation conditions,the degree of hydrolysis of rapeseed meal protein reached 13.1% with high contents of free amino acids and small peptides.
结论发酵过程参数优化后的菜粕蛋白水解度达到了13.1%,增加了游离氨基酸和小肽含量。
参考来源 - 混合菌种固体发酵菜粕生产氨基酸肥料的条件研究·2,447,543篇论文数据，部分数据来源于NoteExpress
植物防御素是一类小肽物质，具有很广的抑菌谱。
Plant defensins are the low molecular weight peptides, which have a broad spectrum of inhibiting the growth of plant pathogens.
小肽营养已成为蛋白质营养研究的热点之一，本文就小肽的生产方法和今后研究方向作一综述。
More attention is paid to study small peptides nutrition in research area of protein nutrition. The production method, research direction in the future were reviewed.
阐述了国内外对小肽的一些研究进展，包括小肽的吸收机制，小肽的吸收特性以及影响吸收的因素。
The thesis reviewed the research progress on small peptide (SP), which include the absorbent mechanism of SP, the absorbent peculiarity of SP and the affected absorption factors.
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