Extraction of Grape Seed Oil Using Compressed Carbon Dioxide and Propane: Extraction Yields and Characterization of Free Glycerol Compounds

详细信息    查看全文

• 作者：Lisiane dos Santos Freitas ; José ; Vladimir de Oliveira ; Clá ; udio Dariva ; Rosâ ; ngela Assis Jacques ; Elina Bastos Caramã ; o
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2008
• 出版时间：April 23, 2008
• 年：2008
• 卷：56
• 期：8
• 页码：2558 - 2564
• 全文大小：286K
• 年卷期：v.56,no.8(April 23, 2008)
• ISSN：1520-5118

文摘

The main objective of this work was to compare the extraction of grape seed oil with compressed carbon dioxide and propane on the extraction yields and chemical characteristics of free glycerol compounds. The experiments were performed in a laboratory scale unit in the temperature range of 30 to 60 °C and pressures from 60 to 254 bar. The results showed that propane is a more suitable solvent for grape seed oil extraction than carbon dioxide, as higher extractions yields and a very fast kinetic of extraction were achieved with this solvent. In relation to compressed carbon dioxide extractions, both temperature and density presented a very pronounced and positive effect on the extraction yield. The oils extracted were analyzed qualitatively and quantitatively with regard to the free glycerol compounds, mainly fatty acids, ethyl, and methyl esters. The results showed that these compounds are present in low concentration in vegetable oil (<3%) and that, in general, samples extracted with propane present a smaller amount of peaks of free glycerol compounds in the oil than samples extracted with carbon dioxide.