Abstract
Rowanberry (Sorbus aucuparia L.) pomace was consecutively extracted with supercritical carbon dioxide (SFE-CO2) and pressurized solvents (PLE) of increasing polarity (acetone, ethanol and water). SFE-CO2 parameters were optimized using central composite design (CCD) and response surface methodology (RSM) in order to obtain the highest lipophilic extract yield. The highest extract yield (4.80%) was obtained at 45MPa pressure, 60°C temperature and 180min extraction time. The changes in SFE-CO2 parameters substantially influenced carotenoids content in the extracts; the recovery of total carotenoids was up to 49.7% of the amount determined by hexane extraction. Linoleic (59%), oleic (27%) and palmitic (9%) fatty acids were dominating in the extracted oil. PLE of SFE-CO2 residue yielded polyphenol-rich extracts (the total extraction yield was 33.1%) with strong antioxidant capacity. Rowanberry pomace should be regarded as a potential source of functional ingredients for food and other relevant uses.
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