Analises físico-químicas e potencial antioxidante de amoras-pretas de diferentes regiões da cidade de Dom Pedrito-RS

Abstract

Proven the importance and increasing demand of blackberry, due to its distinctive flavor and beneficial properties, in view of the wide availability of this fruit in the streets of Dom Pedrito – RS, this study aimed to indentify six black mulberry trees, at different locations in the city of Dom Pedrito - RS and evaluate the physicochemical characteristics and antioxidant potential of its fruit. To that end, was quantified the hydrogen potential, titratable acidity, soluble solids, content of total pherolics and anthocyanins, besides evaluating the antioxidant potential of these fruits. The blackberries were harvested in october 2013 and were evaluated in triplicate. The observations made in the leaves of the trees showed that the blackberries belong to Moaraceas family, and the species is Morus nigra L. wich is used in folk medicine in cases of heat waves and even indicated as hormone replacement therapy. Acording to literature, possesses antioxidant, hypoglycemic, anti-inflammatory and antimicrobial activity. As to the results of the analysis, it can be seen that the potential hydrogenionic showed significant difference (p ≤ 0.05) between samples, the results were between sample VI (3.22) with the lower value and the sample III (4.25) with the highest value, the acidity analysis also showed significant differences (p> 0.05) between samples, with the lowest value with the sample III (0.65%) and the highest value with the sample VI (2.97%) of malic acid and soluble solids presented in greater value in the samples II (16.5) and III (18.2). The percentage of inhibition of antioxidant activity found on the average from 32.49 to 79.82%, for total anthocyanins was no significant difference (p ≤ 0.05) between all samples, with the lowest value with the sample III (47 , 97 mg of cyanidin-3-glicoside.100g-1) and the highest value with sample VI (99.99 mg of cyanidin-3-glicoside.100g-1). Total phenols showed a significant difference (p ≤ 0.05) between samples I (220.92 mg gallic acid.g-1), II (196.87 mg gallic acid.g-1) and V (235 14 mg of gallic acid.g-1). The varieties of blackberry evaluated had levels of sugar and acidity suitable for industrialization, besides being rich in antioxidants.