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42 .   Comparative analysis of vitamin C content, total polyphenols and antioxidant activity of some apple juices

Authors: Delia-Gabriela Dumbravă, Alice Iosin, Camelia Moldovan, Diana- Nicoleta Raba, Mirela -Viorica Popa, Mărioara Drugă

Volume 24, Issue 4;
Pages: 267-270; 2018
ISSN: 2069-0053 (print) (former ISSN: 1453-1399), Agroprint;
ISSN (online): 2068-9551



Abstract:

The purpose of this paper was to determine comparatively the content of ascorbic acid (by the iodometric method), total polyphenols (Folin - Ciocâlteu method) and antioxidant activity (by DPPH free radical assay) of two apples juices, obtained from two apple varieties from the Romanian market: Idared and Golden Delicious. The Idared apple variety and the juice obtained from them, has a higher content of vitamin C (11.201 mg/100g and 33.804 mg/100g, respectively) than the Golden Delicious variety and juice obtained from this apples variety (5.021 mg/100g and 20.402 mg/100g, respectively). Regarding the total polyphenols content, the highest values were also recorded for Idared apples (1.216 mg gallic acid/g) and juice (0.518 mg gallic acid/g). The best antioxidant activity had the juice obtained from the Idared apples (DPPH s average speed of reaction: v = 5,087 μM/s), the juice obtained from the Golden Delicious variety, having a lower antioxidant activity (DPPH s average speed of reaction: v = 3.140 μM/s).

Keywords: apple, juices, antioxidant activity, ascorbic acid

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