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49 .   Content of total polyphenols, vitamin C, mineral elements and the antioxidant activity of some dried fruits from the Romanian market

Authors: Delia-Gabriela Dumbravă, Despina-Maria Bordean, Camelia Moldovan, Viorica–Mirela Popa, Diana-Nicoleta Raba, Adina Berbecea, Ileana Cocan, Ersilia-Călina Alexa

Volume 26, Issue 4;
Pages: 325-329; 2020
ISSN: 2069-0053 (print) (former ISSN: 1453-1399), Agroprint;
ISSN (online): 2068-9551



Abstract:

The purpose of this paper was to analyze several types of dried fruits from the Romanian market (dates, brown raisins and figs) in terms of total polyphenols (Folin-Cioclteu assay), vitamin C (iodometric method) and mineral elements (K, Ca, Mg, Fe, P, Mn, Cu, Cd, Zn, Pb, Cr, Ni) content (atomic absorption spectrophotometry) and also concerning their antioxidant activity (CUPRAC assay). From the three types of dried fruit analyzed, brown raisins were the richest in both total polyphenols (5.17±0.15 mg gallic acid/g) and vitamin C (8.15±0.15 mg/100g). Dried figs were richer in total polyphenols but poorer in ascorbic acid than dried dates. Regarding the antioxidant activity, it was the strongest also in the case of brown raisins (17.82±0.82 mg Trolox/g), the dry dates registering the lowest value (14.08±0.25 mgTrolox/g). Of the heavy metals analyzed, Cd was not identified in any of the dried fruits analyzed. Heavy metals: Cu, Cr, Ni, Pb and Zn, were below the maximum limit provided by law. Brown raisins were the richest in Fe, Mn, Mg, K, while dried figs recorded the highest concentration of Ca and P.

Keywords: dried fruits, polyphenols, vitamin C, mineral elements, antioxidant activity

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