Valorization of extracts from maqui (Aristotelia chilensis) and calafate (Berberis microphylla) biowaste blends by supercritical fluid and pressurized liquid extraction

Maqui and calafate biowastes were fractionated using emerging technologies such as supercritical fluid extraction (SFE) and pressurized liquid extraction (PLE) to obtain bioactive compounds. An extraction pressure of 450 bar and 60 degrees C temperature were the optimal conditions for SFE, which produced an 8.48 % extraction rate and 2011.6 mu g TE/g oil antioxidant capacity. The optimal conditions for PLE included 60 degrees C temperature and 3 extraction cycles; values were 10.19 %, 2285.21 mu g TE/mL, 11.28 mu g GAE/ml, and 540.25 mg eq cya-3-glu/ml or 501.13 mg eq dpd-3-glu/ml for percentage extraction, antioxidant capacity, total polyphenol content, and total anthocyanin content, respectively. Temperature affected the process in both techniques by degrading antioxidant compounds in SFE and facilitating PLE penetration by softening the plant matrix. Serial extraction and biowaste blends increased the content of nutrients with health benefits, especially the maqui/calafate biowaste blend (BB-M/C (75/25).