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1551142 
Journal Article 
Antioxidant and DNA protection activities of a glycoprotein isolated from a seaweed, Saccharina japonica 
Kim, E; Kim, Y; Nam, TJ; Kong, I 
2012 
Yes 
International Journal of Food Science and Technology
ISSN: 0950-5423
EISSN: 1365-2621 
47 
5 
1020-1027 
WOS:000302622600018 
A glycoprotein with a molecular weight of similar to 10 kDa was purified from Saccharina japonica, and its antioxidant activity was evaluated using five different antioxidant assays. The highest antioxidant activities of the purified glycoprotein determined by DPPH, ABTS, SODA, SORS and FRAP assays were 85%, 95%, 94%, 72% and 97%, respectively. About 37% nitric oxide scavenging and 85% xanthine oxidase inhibition activities were also observed at a concentration of 5 mg mL-1. The glycoprotein exhibited optimal activity levels of free radical scavenging at pH 79 and 40 degrees C. Antioxidant activity decreased when treated with ethylenediaminetetraacetic acid and metal ions. Moreover, its scavenging activity decreased when the glycoprotein was treated with deactivation agents such as pronase E or sodium periodate (NaIO4), and it showed protective activity against DNA cleavage induced under oxidative conditions. 
antioxidant activity; glycoproteins; Saccharina japonica; seaweeds