Abstract
Bioactive lipids widely found in daily consumed plants and animals are essential or beneficial to health and some of them are important physiological regulators in the human body. In our current investigation, 18 bioactive lipids (1–18), including 8 sphingolipids (1–8), 7 oxylipins (9–15), 3 phenolic lipids (16–18) were isolated from the fruits of Solanum xanthocarpum. And compounds 1, 9, 15, 16, and 18 were new lipids. In this study, homologues (4–8, 16, and 17) and configuration isomers (2 and 3) of bioactive lipids were separated, and NMR combined with MS/MS2 was an effective method to identify these compounds. These findings provided the reference for the separation and structural identification of bioactive lipids. The anti-inflammatory activities of all isolated lipids were evaluated by their inhibition of the NO release of LPS-induced RAW 264.7 cells. Aglycone components of sphingolipids, oxylipids with free carboxylic acid groups, phenylpropionic acid-fatty acid glyceride polymer exhibited significant anti-inflammatory activities. Further analysis by molecular docking revealed the interactions of bioactive compounds with the iNOS protein.
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