Desenvolvimento e avaliação de subprodutos de uva e sua utilização como ingrediente alimentício

Abstract

Among the fruits, the grape is one of the largest sources of phenolic compounds. the industry of grape spinoffs produces a large amount of waste that most often are underrated. These residues concentrate significant amount of bioactive compounds that arouse interest due to its antioxidant properties and its beneficial effects on human health. In order to take advantage of this by-product, the present study aimed to elaborate flour using residual grape and analyze their bioactive properties. Was used two techniques of drying the residue grape (dryer and freeze dryer) to obtain two kinds of flour, one obtained from the residue from the conventional cultivation and another derived from the organic cultivation. Furthermore, the grapes had been treated with UV-C radiation. The flour was used to prepare cookies, to evaluate its potential as a food ingredient and aggregation of bioactive compounds in the product. The contents of total anthocyanins, phenolic compounds and antioxidant activity, expressed as EC50 and TEAC were determined in the residue, fluor and cookies. Overall treatment with UV-C showed negative or null results. Lyophilization demonstrated longer maintain bioactive properties, as phenolic compounds and anthocyanins. Regarding the type of cultivation, the conventional system in some analyzes showed better maintenance bioactive properties.