The term "peptide" originates from the Greek word "πέσσειν" (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 α-carboxyl group of one amino acid and the α-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. Read More

A peptide bond is a characteristic covalent bond in protein molecules, formed through a dehydration condensation reaction between the α-carboxyl group (α-COOH) of one amino acid and the α-amino group (-NH₂) of an adjacent amino acid. Its chemical nature is an amide bond. Read More

Peptide synthesis refers to the process of constructing amino acid sequences and forming amide bonds (i.e., peptide bonds) through chemical or biological means, essentially enabling the artificial construction of oligopeptide or polypeptide molecules with specific biological functions. As a critical branch of bioorganic chemistry, this technology focuses on the selective activation of amino acid monomers, directional conjugation, and precise control of sequence assembly, spanning the full spectrum from milligram-scale laboratory preparation to kilogram-scale industrial production. Based on divergent synthetic strategies, it is classified into biosynthetic methods relying on biological systems and chemical synthesis methods grounded in organic synthesis principles. Read More

Peptide solubility refers to the maximum amount of peptide that can dissolve in a unit volume of solvent under specific temperature and pH conditions, typically characterized by mass concentration (g/L) or molar concentration (mol/L). As a critical physicochemical property, it directly influences the absorption, distribution, metabolism, and excretion (ADME) processes of peptides in vivo, and also determines the preparation technology, storage stability, and clinical application efficacy of peptide-based drugs. Read More

Amino acids are organic compounds containing an α-amino group (α-NH₂) and an α-carboxyl group (α-COOH), with the general formula RCH(NH₂)COOH. The α-carbon atom is linked to a specific side-chain group (R group), forming the fundamental structural units of biological macromolecules. Read More

Peptide purification is the process of separating and enriching crude peptide mixtures obtained through synthesis or expression using physical, chemical, or biological methods to acquire target peptides of high purity. Read More

Peptide compounds, owing to their specific amino acid sequences and spatial structures, possess the characteristic that their biological activities are highly susceptible to external environmental influences. The primary rationale for peptide storage is to prevent chemical reactions such as degradation, oxidation, and aggregation, thereby maintaining their structural integrity and biological functions. Read More

Research peptides are functionally designed molecules synthesized in laboratories, whose core value lies in providing instrumental support for life sciences research and being exclusively utilized in in vitro research settings. "In vitro research," derived from the Latin term "in vitro" (meaning "in glass"), specifically refers to studies conducted in artificially controlled experimental environments, such as cell culture, molecular interaction analysis, or biochemical reaction assays. Read More