Resumo. O maracujá é uma das frutas mais produzidas no Brasil além de ser altamente consumido devido seu poder funcional, no entanto, seus resíduos (casca e semente) são frequentemente descartados, ocasionando uma série de problemas. Desta forma, para agregar valores aos resíduos foi avaliada a atividade antioxidante (compostos fenólicos, flavonóides, FRAP e DPPH) da semente e casca do maracujá (in natura, desidratada e liofilizada), otimizando os métodos de secagem por esta análise. O processo de secagem por estufa não concentrou os composto antioxidantes, apresentando valores semelhantes da casca in natura, no entanto, a desidratação por liofilização e a semente obtiveram valores muito significativos referente à atividade antioxidante. Portanto, devido seu poder nutricional e antioxidante e para evitar desperdícios e poluição ambiental, os resíduos do maracujá podem ser reaproveitados industrialmente, produzindo e/ou enriquecendo a formulação de alimentos.Palavras-chave: reaproveitamento; atividade antioxidante; otimização da secagem. Drying Optimization by evaluating the antioxidant activity of waste (seed/ peel) of passion fruit. The passion fruit is one of the most produced in Brazil as well as being highly functional power consumed due, however, their waste (peel and seed) are often discarded, causing a lot of problems. Thus, to add value to waste was evaluated the antioxidant activity (phenolic compounds, flavonoids, DPPH and FRAP) of the seed and peel (in natura, dehydrated and lyophilized) of passion fruit drying optimizing methods for this analysis. The kiln drying process not concentrated antioxidant compoundshowed similar values to the in natura peel, however, the lyophilized peel and the seed obtained very significant values related to antioxidant activity. Therefore, due to its nutritional and antioxidant power and to avoid waste and environmental pollution, the passion fruit waste can be reused industrially producing and / or enriching the formulation of foods.
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