Abstract
Abstract The novelty of this study was the use of a subcritical water unit to recover phenolic compounds from papaya seeds, a relevant agroindustrial waste. The effect of temperature conditions on subcritical water extraction (SWE) was compared to Soxhlet extraction (SOX) in terms of total yield, phenolic content (TPC), Maillard reaction products (MRPs), and antioxidant activity, detected by DPPH and β-carotene bleaching methods. TPC and MRPs values were maximized by SWE at 150 °C for 5min, which provided the best antioxidant potential by DPPH method. Liquid chromatography analysis of papaya seed extracts identified 30 phenolic compounds within the samples tested. The main compounds were ferulic acid, mandelic acid, and vanillic acid. It was also found that the subcritical water equipment was successfully applied for the recovery of bioactive compounds from papaya seeds in a simple and effective method.
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