Chemical constituents of Oroxylum indicum roots and Urena lobata roots

Department of Chemistry, Tripura University, Suryamaninagar-799 130, Agartala, Tripura, India

E-mail : dindabtu@rediffmail.com Fax : 91-381-2374801

School of Pharmaceutical Sciences, Kitasato University, 9-1 Shirokane-5-Chome, Minato-Ku,

Tokyo-108 8641, Japan

Manuscript received 20 July 2010, revised 08 November 2011. accepted 21 December 2011

Baicalein, chrysin, oroxylin A, baicalein-6-O-glucoside, β-sitosterol and its 3-O-glucoside, stigmasterol-3-O- glucoside from the root bark of Oroxylum indicum; 13-sitosterol, stigmasterol, campesterol and their 3-O-glucosides from the roots of Urena lobata were isolated. The isolation of baicalein-6-O-glucoside, β-sitosterol and its glucoside and stigmasterol glucoside from the roots of O. indicum and all the steroids from the roots of U. lobata are reported for the first time. All these known constituents were identified by detailed spectroscopic studies. The ¹H and ¹³C NMR data of baicalein-6-O-glucoside pentaacetate is reported.