Comparison on structure, chain conformation, and antioxidant activity of polysaccharides extracted from Liriopes radix with hot water and ultrasound. Issue 4 (3rd May 2020) - Wang, Xiaomei
Abstract: The structures and chain conformations of two polysaccharides from Liriopes radix, WPRL-DS and UPRL-DS, isolated with hot water and ultrasound, respectively, were investigated by a combination of IR, GC, GC-MS, periodate oxidation, Smith degradation, NMR, AFM, and Congo red test. The results proved that the yield of ultrasonic extraction (UPRL-DS) was higher than that of hot water extraction (WPRL-DS). UPRL-DS had the same primary structure as WPRL-DS. However, UPRL-DS was spirally shaped whereas WPRL-DS was not. Both WPRL-DS and UPRL-DS were proved to have significant antioxidant activities as evidenced by their hydroxyl radical, superoxide anion, and 1, 1-diphenyl-2-picryl-hydrazyl radical scavenging activities. UPRL-DS exhibited more effective antioxidant activity than WPRL-DS in a concentration-dependent manner.