Abstract
Soluble epoxide hydrolase (sEH) inhibitory activity guided fractionation and isolation of two new isocucurbic acid derivatives (1 and 2) and nine known compounds (3-11) from the flowers of Chrysanthemum indicum L. Their structures were elucidated on the basis of spectroscopic data interpretation and comparison with those reported in previous studies. Luteolin (3), acacetin-7-O-β-D-glucopyranoside (6), and methyl 3,4-di-O-caffeoylquinate (10) displayed sEH inhibitory activities with IC50 values ranging from 13.7±3.6 to 20.8±0.4 μM. Enzyme kinetic analysis revealed that 3, 6, and 10 were non-competitive inhibitors with Ki values of 14.8±0.5, 31.2±0.8, and 3.9±0.2 μM, respectively. Additionally, molecular docking studies indicated compound 10 had the ability to form six hydrogen bonds at sEH active site, resulting binding energy as low as -9.58 Kcal/mol.
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