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http://dx.doi.org/10.9721/KJFST.2018.50.4.430

Antioxidant and α-glucosidase inhibitory activities of fresh bitter melon and change of charantin and lutein content upon brining and blanching treatments of pickling  

Park, HyoSun (Food and Nutrition in Dept. Human Ecology, College of Natural Science, Korea National Open University)
Moon, BoKyung (Department of Food and Nutrition, Chung-Ang University)
Kim, Suna (Food and Nutrition in Dept. Human Ecology, College of Natural Science, Korea National Open University)
Publication Information
Korean Journal of Food Science and Technology / v.50, no.4, 2018 , pp. 430-436 More about this Journal
Abstract
This study aimed to analyze charantin and lutein from fresh bitter melon (FBM) for their antioxidant and ${\alpha}$-glucosidase inhibitory activities. We subsequently compared our results with charantin and lutein content of pickled bitter melon (PBM11, PBM13, PBM51, and PBM53), obtained by brining (1 and 5% salt) and blanching (1 and 3 min). Charantin, lutein, $\text\tiny{L}$-ascorbic acid, and total polyphenolic content in FBM were $777.92{\pm}27.59$, $16.87{\pm}2.07$, $94.78{\pm}0.61$, and $22.07{\pm}0.74mg$ catechin equivalents/g on dry basis, respectively. Antioxidant activity of 5 mg/L FBM extract was $31.76{\pm}0.42%$ in ABTS assay and $56.19{\pm}2.39%$ in DPPH assay; ${\alpha}$-glucosidase inhibitory activity of 0.5 mg/L FBM extract was $55.60{\pm}1.34%$. Charantin and lutein content of all PBM samples were higher than control without brining and blanching treatments, those in PBM53 being $375.63{\pm}9.03$ and $4.07{\pm}0.40mg/100g$, respectively. These showed that brining and blanching in pickling process were very effective in retaining charantin and lutein in bitter melon.
Keywords
bitter melon; charantin; lutein; brining; blanching;
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