Quantitative analysis of antiradical phenolic constituents from fourteen edible Myrtaceae fruits
Authors
Kurt Reynertson
a Department of Biological Sciences, Lehman College and the Graduate Center, City University of New York, 250 Bedford Park Boulevard West, Bronx, NY 10468
Hui Yang
a Department of Biological Sciences, Lehman College and the Graduate Center, City University of New York, 250 Bedford Park Boulevard West, Bronx, NY 10468
Bei Jiang
a Department of Biological Sciences, Lehman College and the Graduate Center, City University of New York, 250 Bedford Park Boulevard West, Bronx, NY 10468
Margaret Basile
b Department of Neurology, University of Miami Miller School of Medicine, 1501 NW 9th Avenue,Miami, FL 33136
Edward Kennelly
a Department of Biological Sciences, Lehman College and the Graduate Center, City University of New York, 250 Bedford Park Boulevard West, Bronx, NY 10468
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 101 mg/g, TAC ranged from undetectable to 12.1 mg/g, and antiradical activity, measured as DPPH˙ IC50, ranged from very active (19.4 μg/ml) to inactive (389 μg/ml).
Keywords: HPLC-PDA, quantitative analysis, Myrtaceae, Myrciaria, Eugenia, Syzygium, antioxidant, flavonoid, anthocyanin, Folin-Ciocalteu, DPPH, polyphenolic
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