Abstract

The goal of this study was to elucidate the characteristics and properties of polysaccharides from different parts of cultivated Hibiscus manihot L. (HM). Polysaccharides were extracted with hot-water from the flowers, leaves, roots, stems and epidermis of HM. Two purified fractions having high content, HMPS-F2 and HMPS-F4, were isolated from floral polysaccharides. The results showed that HMPS-F2 was a homopolysaccharide composed of glucose residues with an average molecular weight of 8.59 × 104 Da, which might have a backbone structure of →1)-α-d-Glcp (4→. HMPS-F4 was a natural acetylated heteropolysaccharide with a complex structure and an average molecular weight of 1.63 × 105 Da. It was mainly composed of Rha(rhamnose), GalA(galacturonic acid), and Gal(galactose) with a molar ratio of 3.06:1.00:1.62. The results of antioxidant experiments showed that HM polysaccharides (0.125–4.0 mg/L) had certain inhibitory effects on DPPH radicals, hydroxyl radicals and lipid peroxidation, among which the scavenging effect on hydroxyl radicals was the best. These results suggest that HM polysaccharide is a potent active ingredient that may play an active role in the medicinal activity of HM.

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