Introduction to Peptides

By Peptide InformationApril 21, 2025

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Introduction to Peptides

The term "peptide" originates from the Greek word "péssein," meaning "to digest." A peptide is a compound formed by amino acids linked through peptide bonds. Peptide bonds, which are amide bonds, arise from the dehydration condensation between the alpha-carboxyl group of one amino acid and the alpha-amino group of another.

Classified by amino acid count, peptides with 2 to 20 amino acids are termed oligopeptides, those with 20 to 50 are polypeptides, and sequences exceeding 50 amino acids with specific spatial structures are generally categorized as proteins. Peptides typically have a molecular weight below 10 kDa.

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