Isorhamnetin

Comparison of the preventive activity of isorhamnetin glycosides from atsumi-kabu (red turnip, Brassica, campestris L.) leaves on carbon tetrachloride-induced liver injury in mice.
Biosci Biotechnol Biochem. 2008 March. Igarashi K, Mikami T, Takahashi Y, Sato H. Department of Bioresource Engineering, Faculty of Agriculture, Yamagata University, 1-23 Wakaba-machi, Tsuruoka-shi, Yamagata 997-8555, Japan.
Isorhamnetin 3-O-glucoside, which is contained together with isorhamnetin 3,7-di-O-glucoside in atsumi-kabu leaves, suppressed increases in the plasma ALT and AST activities of mice with liver injury induced by the injection of carbon tetrachloride, but no suppression by isorhamnetin 3,7-di-O-glucoside was apparent. This result indicates that the release of glucose at the 7-position in isorhamnetin 3,7-di-O-glucoside was very important to mitigating liver injury.

Inhibitory effect of isorhamnetin and hesperidin on the oxidation of high-density lipoproteins (HDL) induced by Copper.
Sichuan Da Xue Xue Bao Yi Xue Ban. 2007 Nov. Division of Peptides Related with Human Diseases, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China.
To test the inhibitory effect of isorhamnetin and hesperidin on the HDL oxidation induced by Cu2+. The serum HDL was isolated by the one step density gradient ultracentrifugation. The HDL oxidation was induced by Cu2+ in vitro for different length of periods. Isorhamnetin and hesperidin at 5 micromol/L, respectively, were added 3 h before the copper oxidation. Both isorhamnetin and hesperidin inhibit the oxidation of HDL, but isorhamnetin was stronger.

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