Antioxidant activities, flavonol and flavanol content of selected Southeast Asian indigenous fruits
2007
Santiago, D.M.O. | Garcia, V.V. | Dizon, E.I., Philippine Univ. Los Baños, College, Laguna (Philippines). Food Science Cluster | Merca, F.E., Philippines Univ. Diliman, Diliman, Quezon City (Philippines). Inst. of Chemistry
Flavonols and flavanols are known to have antioxidative, antimutagenic, anti-inflamatory and anticarcinogenic effects. This study evaluated the antioxidant potential, total phenolic and flavonoid content, and the flavonol(quercetin, myricetin) and flavanol(catechin, epicatechin) content of fruits of duhat(Syzigium cumini (Linn.) Skeels), kalumpit(Terminalia microcarpa Decne), bignay(Antidesma bunius (Linn.) Spreng) and Lipoti(Syzygium polycephaloides (C.B. Robinson) Merr.) which are indigenous to Southeast Asia and widely distributed throughout the Philippines. Results showed that percent non-site-specific scavenging activities of all the fruits were higher than their percent site-specific scavenging activities. Thus, these fruits were better as hydroxyl-radical scavengers than metal chelators. The percent inhibition of linoleic acid peroxidation of duhat, bignay, lipoti and kalumpit were 80.4%, 75.8%, 73.7% and 66.2%, respectively, compared with 85% and 81% for BHT [butylated hydroxytoluene] and BHA [butylated hydroxyanisole]. Methanolic extracts of duhat, bignay, kalumpit and lipoti were used for the detection of specific flavonols and flavanols. Lipoti and duhat contained 58.85 and 36.55 micro g catechin/g fresh sample, respectively. Catechin was not detected in kalumpit but it contained 23.42 micro g epicatechin/g fresh samples. Bignay, on the other hand, was determined to have both catechin and epicatechin with 20.40 and 1.47micro g/g fresh samples, respectively. Kalumpit, duhat and bignay also contained 2.73, 0.66 and 0.22 micro g quercetin/g fresh samples, and 5.47, 7.17 and 0.42 micro g myricetin/g fresh samples, respectively.
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