The study on antioxidant activity of ulvan-calcium derivative

Abstract

Ulvan is a water-soluble polysaccharide that is extracted from the algae Ulva pertusa (Chlorophyta). In this study, ulvan-calcium derivative (U-calcium) was prepared and calcium content was 5.2%. Ulvancalcium could effectively scavenge on 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2'-azino-bis (3-ethylbenzothiazolie-6-sulfonic acid) (ABTS), hydroxyl, and superoxide radicals. The inhibition rate on superoxide radicals (•O 2-) was 83.14% at 0.2 mg/mL, and the scavenging activity of ABTS and hydroxyl radical (•OH) at 3.0 mg/mL was 58.45 and 43.65%, and that of DPPH radicals at 8.0 mg/mL was 57.37%. All results showed that the antioxidant activity of ulvan-calcium was stronger than that of ulvan. The ulvan-calcium maybe used as an antioxidant to remove ROS and resist excessive oxidative stress.

Characterization and in vitro antibacterial activity of sulfated polysaccharides from freshwater alga Cladophora crispata

“…They show important biochemical properties, which require further investigation to understand their structure and biochemical functions. Several studies have reported the antibacterial, antifungal and antiviral properties of sulfated polysaccharides (SPs) [9][10][11], as well as their scavenging activity against superoxide, hydroxyl, DPPH (1,2-diphenylpicrylhydrazyl) and ABTS radicals [2,2′-azino-bis (3ethylbenzothiazoline-6-sulfonicacid) diammonium salt] [12,13], and they have commercial applications in food industries [14]. Moreover, the SPs from Cladophora oligoclada have been reported to have anticoagulant properties [15].…”