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天然肽在生物体内合成,是由生物体细胞或组织分泌排泄的产物。它们引起人们的重视,因为它们是氨基酸合成蛋白质的中间产物,并且它们多半为具有强烈生物活性的物质,如激素、抗菌素、毒素和生长因素等。从本世纪40年代以来,由于分离技术的进步,天然肽的研究工作已有了很大的进展。肽类和蛋白质一样,一般是由氨基酸通过肽键互相结合起来,它们与蛋白质的区别在于:分子量较小,一般在10,000以下,能透过纤维膜;不变性;在一个分子中氨基酸的种数较少。但是,这样的定义并不十分
Natural peptides are synthesized in the organism and secreted by the cells or tissues of the organism. They attract people’s attention, because they are amino acid protein synthesis intermediates, and most of them are strongly bioactive substances, such as hormones, antibiotics, toxins and growth factors. Since the 1940s, great progress has been made in the research of natural peptides due to the progress of separation technology. Peptides, like proteins, are usually joined by peptide bonds through amino acids that differ from proteins in that they have a low molecular weight, typically less than 10,000, and are permeable to fiber membranes; invariance; the number of amino acids in a molecule less. However, this definition is not very good