کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
230616 | 1427396 | 2013 | 7 صفحه PDF | دانلود رایگان |

Pinus pinaster wood samples were extracted with near and supercritical CO2.The effect of pressure (1025 MPa), temperature (3050 °C) and ethanol as co-solvent was assessed.Under selected conditions (25 MPa, 50 °C, 10% ethanol), 4 wt% was extracted.One gram of extract contained 76 mg of GAE and was equivalent to 0.3 g Trolox.Selected extracts contained 30% resin acids and 10% of the sum of flavonoids, lignans, stilbenes and juvabiones.
Near-supercritical and supercritical CO2 was used to extract low-molar-mass phenolics and lipophilic compounds from Pinus pinaster wood. Extraction of samples containing sapwood and knotwood was carried out at 1025 MPa and 3050 °C to assess the influence of the operational conditions on the yields of total extracts and phenolics, as well as on the radical scavenging capacity of extracts. The use of ethanol as a co-solvent increased both the extraction yields and the concentration of phenolics in extracts. Operating under selected conditions (25 MPa, 50 °C, 10% ethanol), the extraction yield accounted for 4.1 wt% of the oven-dry wood. The extracts contained up to 7.6 g of phenolic compounds (measured as gallic acid equivalents) per 100 g extract, and showed one third of the radical scavenging capacity of Trolox. Native resin acids accounted for about 24 g per 100 g extracts, whereas flavonoids, lignans, stilbenes and juvabiones were found at lower proportions.
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Journal: The Journal of Supercritical Fluids - Volume 81, September 2013, Pages 193–199