In this study, we evaluated the effects of the storage time on the physicochemical properties, bioactive compound content, and antioxidant capacity of jam prepared from grape peel extract to explore its potential as a supplementary food and/or functional ingredient. The ethanolic extract from Syrah var. grape peel exhibited high bioactive compound concentrations and antioxidant activity. The jam stability (prepared with 8.9% of extract) at 14°C was evaluated at 0, 15, 30, 45, and 60 days. The jam was found to contain high concentrations of polyphenolic compounds (137.0 ± 3.2 mg of gallic acid equivalent/100 g), total flavonoids (128.5 ± 23.0 mg of equivalent/100 g), and total anthocyanins (92.5 ± 4.0 mg of cyanidin equivalent/100 g). However, a large reduction in the flavonoid (70%–90%), anthocyanin (29%–35%), and phenolic (23%–30%) content was observed during storage. The free radical‐scavenging activity (DPPH − ), ferric reducing antioxidant power (FRAP), and β‐carotene‐linoleic acid assays revealed the great antioxidant potential of the jam prepared from grape peel extract, which exhibited significant levels of radical‐neutralizing activity, especially as determined by the DPPH method with EC 50 values ranging from 2.3 ± 0.1 to 3.9 ± 0.1 µg/ml. High R 2 values ( p > 0.90) were obtained for the correlation between the DPPH results and the concentrations of the compounds of interest. In summary, the high bioactive compound contents and antioxidant capacity of the jam produced from grape peel suggest that it may provide health benefits as a source of natural antioxidants upon incorporation to several food industry products.
Compostos bioativos naturais são substâncias presentes em frutas e hortaliças, que quando ingeridas diariamente, em quantidades estabelecidas, podem ajudar à saúde, como por exemplo, sendo um aliado na prevenção de câncer e de outras doenças. Objetivo deste trabalho foi prospectar pesquisas desenvolvidas com compostos bioativos de uva, verificando numero de patentes e a frequência de depósitos nos países que detêm essa tecnologia. A consulta foi realizada na base Espacenet, utilizando como estratégia de busca o uso das palavras-chaves e códigos para determinar as patentes correspondentes. As patentes começaram a ser depositadas em 1969 e o maior número de depósitos ocorreu em 2005 e 2011, sendo este crescimento devido o avanço tecnológico e com o desenvolvimento de novos produtos e tecnologias. A China, Rússia e Coréia do Sul se apresentaram como os maiores depositantes, sendo que a maioria dos depósitos foram realizados por empresas.Palavras chave: Fenólicos. Biocompostos. Extrato Uva.
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