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Solubility of carbohydrates in supercritical carbon dioxide with (ethanol + water) cosolvent
- Source :
- The Journal of Supercritical Fluids. 49:16-22
- Publication Year :
- 2009
- Publisher :
- Elsevier BV, 2009.
-
Abstract
- Prebiotic carbohydrates are defined as non-digestible carbohydrates that beneficially affect the host by selectively stimulating the growth and/or activity of a limited number of bacteria in the colon. The present study is focused on two prebiotic ketosugars: tagatose and lactulose, which are currently obtained by alkaline isomerization of their respective aldoses—galactose and lactose. It is a part of a broader research devoted to examining the possibility of complex solid carbohydrate mixtures fractionation using supercritical carbon dioxide and alcohol-type cosolvents. We report new experimental solubility data of tagatose, galactose, lactulose and lactose in supercritical carbon dioxide with ethanol:water (95:5, v/v) used as a cosolvent at T = (60 and 100) °C, P = (10–30) MPa and cosolvent content from 6 to 21% (w/w). The solubility measured was in the range (0.02–1.09) mg g −1 . Additionally, the experimental data was correlated using the Soave–Redlich–Kwong cubic equation of state with the modified Huron-Vidal second order (MHV2) mixing rule. The latter employs the mS-UNIFAC, which introduces two new groups in the original UNIFAC parameter matrix to represent the sugar molecules.
Details
- ISSN :
- 08968446
- Volume :
- 49
- Database :
- OpenAIRE
- Journal :
- The Journal of Supercritical Fluids
- Accession number :
- edsair.doi...........5cbc97a0f75d8d9fb571a4423297926c