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Bestatin hydrochloride, also named Ubenimex hydrochloride, is a natural‑origin dipeptide compound initially isolated from Streptomyces olivoreticuli. It serves as a competitive aminopeptidase inhibitor, mainly targeting aminopeptidase N (CD13), aminopeptidase B and leukotriene A4 hydrolase. It suppresses N‑terminal amino‑acid cleavage by aminopeptidases. This agent shows immunomodulatory, anti‑angiogenic and anti‑tumor activities. Clinically approved in Japan for adjuvant cancer therapy, it boosts immune‑cell function. It is also widely used as a critical biochemical research tool for aminopeptidase‑related mechanism studies.
Bestatin hydrochloride, also named ubenimex hydrochloride, is a competitive, reversible aminopeptidase inhibitor originating from Streptomyces olivoreticuli. It is not an approved food additive for direct human consumption in mainstream food regulatory systems, yet it serves as a critical laboratory research tool for food‑protein processing studies, rather than a regular production ingredient in commercial food factories.
In food‑related research, its core function is to block metallo‑aminopeptidases including aminopeptidase N, aminopeptidase B and leucine aminopeptidase, which catalyze N‑terminal amino‑acid cleavage of polypeptides. Researchers apply it to explore hydrolysis mechanisms of plant‑based and animal‑derived protein hydrolysates, such as soy protein, fish protein and milk‑derived peptides. By suppressing aminopeptidase activity, scientists can distinguish contributions between endoproteases and exopeptidases, analyse peptide bitterness formation, and investigate how free amino‑acid release shapes flavour profiles of seasonings, yeast extracts and cheese‑model systems.
Another research direction focuses on bioactive food peptides. Bestatin hydrochloride helps evaluate degradation of functional dipeptides like carnosine in food matrices. It blocks peptidases that break down bioactive peptides, assisting researchers to test peptide stability and bioavailability in simulated food processing and gastrointestinal digestion conditionsPMC.
It is worth emphasizing that this compound is mainly for biochemical lab assays. It is a pharmaceutical‑grade reagent, not permitted to be added into finished food products. Industrial food manufacturing uses food‑grade aminopeptidase enzymes instead of this inhibitor to achieve de‑bittering and flavour‑enhancing effects for protein hydrolysates.
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