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Dipeptide

Biological substance, peptide composed of two amino acids
By two amino acid The compound formed by molecular condensation is called dipeptide [1] In a broad sense, dipeptides include chain dipeptides and cyclic dipeptides. for example Propylene dipeptide It was created by L-Alanine and l-glutamic acid Condensed dipeptide; Carnosine Is created by β- alanine and l-his two types amino acid composition Dipeptide of. Ring( histidine - proline )Dipeptide can be made from corn Proteolysis Obtained from L-histidine and L-Proline Cyclic dipeptide formed by cyclization.
Chinese name
Dipeptide
Status
The simplest peptide
Composition
amino acid
Nature
protein Fragment or substance

give an example

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Dipeptide
As from a free α- carboxyl Of glycine Residue And one containing free α- Amino alanine The dipeptide composed of residues is called Glycyl alanine

Preparation and preservation

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protein It can be hydrolyzed by acid, alkali or enzyme, and the protein will gradually degrade into Peptone , polypeptide Tripeptide And dipeptides, until they finally become Amino acid mixture
In vivo, dipeptide can usually be Dipeptidase Hydrolyzed into two free amino acid There is also an active energy consuming operation system to absorb dipeptide or tripeptide on intestinal mucosal cells in vivo, so dipeptide absorbs cells before free amino acid Said.
Dipeptide is a compound Natural amino acid Alpha amino Acid (amino linked carboxyl The amino group in dehydration synthesis And become. Only one of them Peptide bond That is - CO-NH -. Hydrolyzable.
Most peptides are unstable in nature, and should be kept away from moisture for long-term storage at a place below 4 ℃.

Key values

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Active peptide , and nutrition, hormone Enzyme Inhibit, regulate immunity, resist bacteria antiviral Antioxidation is closely related.