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In vitro Anti-diabetic Activity and Chemical Characterization of an Apolar Fraction of Morus alba Leaf Water Extract

Authors


Correspondence to: Attila Hunyadi Ph.D. Institute of Pharmacognosy, University of Szeged, Eötvös str. 6. 6720Szeged, Hungary; Tusty-Jiuan Hsieh Ph.D. Department of Medical Genetics, Kaohsiung Medical University, 100 ShihChuan 1st rd., 807 Kaohsiung, Taiwan, R.O.C.

E-mail: hunyadi.a@pharm.u-szeged.hu; hsiehjun@kmu.edu.tw

Abstract

The tea from the white mulberry (Morus alba L.) leaf is a worldwide known traditional medicine of type II diabetes. Here, we report the investigation of the dichloromethane-soluble fraction obtained in a 0.24% m/m yield from the hot water extract of mulberry leaves. A significant, dose-dependent activity was found by means of the 24-h glucose consumption of fully differentiated adipocytes both in the absence and presence of insulin. The fraction was characterized by HPLC-DAD, GC-MS and GC-FID. The main constituent (40.3% by means of GC-FID) was isolated and identified as loliolide by EIMS, HRESIMS and NMR spectroscopy. In the active fraction benzyl alcohol, ethyl benzoate, t-cinnamic acid, p-hydroxyacetophenone, t-coniferyl alcohol and synapil alcohol were also identified by GC-MS and quantified by GC-FID (0.7, 1.3, 1.5, 2.9, 7.5 and 2.6%, respectively). Copyright © 2012 John Wiley & Sons, Ltd.

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