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Quantitative analysis of antiradical phenolic constituents from fourteen edible Myrtaceae fruits

Reynertson, Kurt A., Yang, Hui, Jiang, Bei, Basile, Margaret J., Kennelly, Edward J.
Food chemistry 2008 v.109 no.4 pp. 883-890
quantitative analysis, food analysis, food composition, free radical scavengers, phenolic compounds, Myrtaceae, fruits (food), anthocyanins, Eugenia, Myrciaria, Syzygium, cyanidin, ellagic acid, kaempferol, myricetin, quercetin, quercitrin, rutin, fruit extracts
Many species of Myrtaceae are cultivated in home gardens throughout the tropics for their edible fruit, and have been used in traditional medicine to treat several inflammatory conditions. Fruit phenolics are important dietary antioxidant and anti-inflammatory constituents. We have investigated the antiradical activity, total phenolic content (TPC), and total anthocyanin content (TAC) of 14 underutilized Myrtaceae fruits, namely Eugenia aggregata, E. brasiliensis, E. luschnathiana, E. reinwardtiana, Myrciaria cauliflora, M. dubia, M. vexator, Syzygium cumini, S. curranii, S. jambos, S. javanicum, S. malaccense, S. samarangense, and S. samarangense var. Taiwan pink. An HPLC-PDA method was developed to quantify the amounts of cyanidin 3-glucoside (1), delphinidin 3-glucoside (2), ellagic acid (3), kaempferol (4), myricetin (5), quercetin (6), quercitrin (7), and rutin (8) present in MeOH extracts of the fruit. TPC ranged from 3.57 to 101mg/g, TAC ranged from undetectable to 12.1mg/g, and antiradical activity, measured as DPPH radical C₅₀, ranged from very active (19.4μg/ml) to inactive (389μg/ml).