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KMID : 1161420100130010223
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Journal of Medicinal Food
2010 Volume.13 No. 1 p.223 ~ p.227
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Oxygen Radical Absorbance Capacity of Phycocyanin and Phycocyanobilin from the Food Supplement Aphanizomenon flos-aquae
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Benedetti Serena
Benvenuti Francesca
Scoglio Stefano
Canestrari Franco
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Abstract
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The oxygen radical absorbance capacity (ORAC) assay has been widely used to quantify peroxyl radical scavenging capacity of pure antioxidant compounds and antioxidant plant/food extracts. However, it has never been applied to natural compounds derived from microalgae-based dietary supplements, namely, phycocyanin (PC) and phycocyanobilin (PCB), for which a strong radical scavenger activity has been documented. In this article, we applied the ORAC method to investigate the capacity of PC and PCB purified from the edible microalga Aphanizomenon flos-aquae to directly quench peroxyl radicals in comparison to well-known antioxidants molecules such as Trolox, ascorbic acid, and reduced glutathione. As a result, PCB was found to have the highest ORAC value (22.18?μmol of Trolox/μmol of compound), comparable to that of PC (20.33?μmol of Trolox/μmol of compound), hence confirming that PCB is mostly responsible for the scavenger activity of PC and making the protein a possible source of the antioxidant in vivo. Our data further corroborate the use of these natural compounds from A. flos-aquae as dietary antioxidant supplements in the treatment of clinical conditions related to oxidative stress.
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KEYWORD
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Aphanizomenon flos-aquae, oxygen radical absorbance capacity, peroxyl radicals, phycocyanin, phycocyanobilin
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