Phenol content, antioxidant and tyrosinase inhibitory activity of mangrove plants in Micronesia

摘要

Objective:To find out and compare the in vitro antioxidant and tyrosinase inhibitory activities of two species of mangrove plants.Methods:Mangrove samples were harvested at the shoreline on the island ofWeno,ChuukState inMicronesia.The phenol content, antioxidant activity(based onDPPH-free radical scavenging) and tyrosinase inhibitory activity in different tissues(leaves, barks and roots) ofRhizophora stylosa (R. stylosa) andSonneratia alba (S. alba), collected from the island ofWeno.Results:Total phenol content ranged from4.87 to11.96 mg per g of freeze dried samples.The highest antioxidant activity was observed inR. stylosa bark(85.5%).The highest tyrosinase inhibitory activity was found inS. alba bark.Also, total phenol content and antioxidant activity were higher in methanol extracts than in aqueous extracts.Conclusions:Taken together, the results of this study proved that mangroves can be excellent sources of antioxidant compounds.