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The aim of this study was to evaluate the potential use of crop wastes (stems and leaves) from broccoli, beans and tomato to extract antioxidant polyphenols. Two different methods of extraction were performed: ultrasound (40 kHz) and conventional with 70 °C. In both methods, alkaline and acidic solvents were used. The polyphenol composition was assessed by HPLC‐DAD/UV‐VIS, and the 2,2‐diphenyl‐1‐picrylhydrazyl...
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