کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6477697 | 1427346 | 2017 | 7 صفحه PDF | دانلود رایگان |
- Two-step SC-CO2 extraction for polyphenols TPC and proanthocyanidins FI, FII, FIII.
- P, CO2 flow rate, % co-solvent studied by Box-Behnken design on the second step.
- Optimum extraction conditions: 80Â bar, 6Â kg/h CO2 flow rate, 20% co-solvent.
- 7132Â mg GAE/100Â g DM value of TPC achieved in validation experimental.
- Kinetic study of TPC carried out.
Polyphenol extraction from white grape seeds using supercritical carbon dioxide (SC-CO2) containing different percentages of ethanol-water mixture (57% v/v) as co-solvent was carried out at 40 °C. Box-Behnken experimental design was used to optimize the process variables: pressure (80, 100, 120 bar), CO2 flow rate (2, 4 and 6 kg/h) and co-solvent percentages (10, 15, and 20% (w/w)). Total polyphenols (TPC) and fractionation of proanthocyanidins were determined.The statistically generated optimum extraction conditions to obtain the highest total polyphenol concentration were a pressure of 80 bar, CO2 flow rate of 6 kg/h and 20% (w/w) co-solvent. The value achieved in validation experimental was 7132 mg GAE/100 g DM. Under these operating conditions a good extraction of FI (>1000 mg catechin/100 g DM) and FII (>800 mg catechin/100 g DM) are obtained.
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Journal: The Journal of Supercritical Fluids - Volume 130, December 2017, Pages 239-245