, Volume 31, Issue 5, pp 666-670
Date: 15 May 2008

A new pancreatic lipase inhibitor isolated from the roots of Actinidia arguta

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A new coumaroyl triterpene, 3-O-trans-p-coumaroyl actinidic acid (1), as well as five known triterpenes, ursolic acid (2), 23-hydroxyursolic acid (3), corosolic acid (4), asiatic acid (5) and betulinic acid (6) were isolated from an EtOAc-soluble extract of the roots of Actinidia arguta. The structure of compound 1 was elucidated from interpretation of the spectroscopic data, particularly by extensive 1D and 2D NMR studies. All the isolates (1–6) were evaluated in vitro for their inhibitory activities on pancreatic lipase (PL). Of the isolates, the new compound 1 possessed the highest inhibitory activity on PL, with an IC50 of 14.95 μM, followed by ursolic acid (2, IC50 = 15.83 μM). The other four triterpenes (3–6) also showed significant PL inhibitory activity, with IC50 values ranging from 20.42 to 76.45 μM.