Yu Y, Zuo C, Li M, Tang Y, Li L, Wang F, Zhang S, Sun B. Novel l-Cysteine Incomplete Degradation Method for Preparation of Procyanidin B2-3'-
O-Gallate and Exploration of its
in Vitro Anti-inflammatory Activity and
in Vivo Tissue Distribution.
J Agric Food Chem 2024;
72:4023-4034. [PMID:
38357881 DOI:
10.1021/acs.jafc.3c05616]
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Abstract
In this study, an effective method for preparation of bioactive galloylated procyanidin B2-3'-O-gallate (B2-3'-G) was first developed by incomplete depolymerization of grape seed polymeric procyanidins (PPCs) using l-cysteine (Cys) in the presence of citric acid. The structure-activity relationship of B2-3'-G was further evaluated in vitro through establishing lipopolysaccharide (LPS)-induced inflammation in RAW264.7 cells. The results suggested that the better protective effects of B2-3'-G against inflammation were attributed to its polymerization degree and the introduction of the galloyl group, compared to its four corresponding structural units. In vivo experiments demonstrated that the B2-3'-G prototype was distributed in plasma, small intestine, liver, lung, and brain. Remarkably, B2-3'-G was able to penetrate the blood-brain barrier and appeared to play an important role in improving brain health. Furthermore, a total of 18 metabolites were identified in tissues. Potential metabolic pathways, including reduction, methylation, hydration, desaturation, glucuronide conjugation, and sulfation, were suggested.
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