Extraction and evaluation of α-glucosidase inhibitory activity of polysaccharide from Urena lobata L. roots

Abstract

Polysaccharides are compounds found in the roots of Urena lobata L. Polysaccharides are of interest due to many valuable biological activities such as immunomodulatory, anti-cancer, diabetes treatment, anti-inflammatory and antioxidant. In this research, polysaccharides extracted from Urena lobata L. roots were analyzed by GC-MS (Gas Chromatography Mass Spectometry) and GPC (Gel Permeation Chromatography). The results show that the polysaccharide from Urena lobata L. natural roots is a heteropolysaccharide. This polysaccharide has two peaks with the weighted average molecular weights (Mw) as 1.823 x 107 g/mol and 1.139 x 105 g/mol. The monosaccharide composition of this polysaccharide includes rhamnose, arabinose, xyloza, mannose, glucose and galactose with the composition ratios of 13.927, 16.579, 3.174, 5.442, 27.659 and 33.219% respectively. In addition, when investigating the α-glucosidase inhibitory activity of polysaccharide from three types of Urena lobata L. roots cultured under different conditions: natural, in vitro and aeroponics, the results showed that the activity of in vitro hairy root polysaccharide was the best. This shows the potential for the development of biologically active polysaccharide sources by in vitro hairy root culture of Urena lobata L.