Abstract
Subcritical extraction (SFE) of dry and ground Golden delicious peels (30g) was investigated at 25MPa and 50°C using CO2 and ethanol (96%) in 75:25mol ratio. As for conventional ethanol or methanol/acetone/water extraction, nine phenolics were identified in SFE-extracts including the sugar-based phloridzin and quercetin derivatives. Extraction kinetics of the nine phenolics and of the global yield were monitored via collection of fractions that were also characterized for their antioxidant activity (ABTS antiradical activity). Kinetics showed a constant extraction rate up to 1.1kg of fluid and a decreasing rate afterwards, but the matrix was not exhausted after 3h of extraction. Besides the classical continuous flow protocol, SFE was performed by introducing static periods between the dynamic collect of fractions. Static periods did not yield significant improvement in the overall yield and in the individual yield of most phenolics. Increasing the matrix loading did not improve the recovery either. Conversely, extractions from 15g provided the highest phenolics yield of 800mg/100gdry peels. For extracts tested for antioxidant capacity (30g loading), values up to 5–6mgEquivalent Ascorbic Acid/gextract were obtained. Activities were positively correlated with phenolics concentration in fractions only for static conditions.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
