کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
230643 | 1427390 | 2014 | 6 صفحه PDF | دانلود رایگان |
• CO2 flow rates modified with 15% EtOH-W (57%, v/v).
• Effect of pressure on phenols extraction studied at 8–30 MPa/313.15 K.
• Effect of co-solvent percentage studied at 7.5, 10 and 15%.
• High phenols yield and antioxidant activity at low co-solvent percentage.
• High selectivity for proanthocyanidins fractions at 6 kg/h CO2–10% EtOH-W.
The extraction of phenolic compounds from grape marc using supercritical CO2 containing 15% ethanol–water mixture (57%, v/v) (EtW) as co-solvent, at 8, 10, 20 and 30 MPa/313.15 K suggested 8 MPa as the most suitable pressure. At 8 MPa/313.15 K, different co-solvent percentages (15, 10, 7.5%) at CO2 flow rate of 6 and 4 kg/h were investigated for proanthocyanidins (PAs) the extraction. The highest extraction yields were obtained at 4 kg/h CO2–7.5% EtW flow rate (2600 mgGAE 100 gDM−1) and 6 kg/h CO2–10% EtW (2527 mgGAE 100 gDM−1). At 6 kg/h CO2–10% EtW flow rate the amounts of monomeric (188 mgcatechin 100 gDM−1) and oligomeric (154 mgcatechin 100 gDM−1) fractions of PAs, as well as their antioxidant activity (809 and 546 mgα-tocopheroll 100 gDM−1) were higher than at 4 kg/h CO2–7.5% EtW-flow rate. SC-CO2 methods were compared with conventional methanol extraction.
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Journal: The Journal of Supercritical Fluids - Volume 87, March 2014, Pages 59–64