Development of method for extract biological activeompounds of yam by using supercritical carbon dioxide
Date Issued
2009
Date
2009
Author(s)
Ho, Chun-Hung
Abstract
Abstract Dioscorea spp. is a kind of common food and material for drug and health food in Taiwan. There are many scholars studied about biological active compounds of Dioscorea spp., and most of them get the compounds by using solvent extraction. Supercritical fluid (SCF), at the temperature and pressure above critical point, material will exhibit properties different from gas and liquid at the supercritical state and we can change the physical properties of SCF by control the temperature and pressure. Carbon dioxide has been widely used as the solvent for supercritical extraction due to its safety and availability. Solubility parameter (δ) provides a numerical estimate of the degree of interaction between materials, and can be a good indication of solubility. The objective of this study is to investigate the feasibility of extracting bioactive compounds from yam using supercritical carbon dioxide. The operating conditions, temperature, pressure and solubility parameter, will be studied. Organic solvent and supercritical carbon dioxide extraction shows similar results, High solubility parameter organic solven and SC-CO2 can extract more diosgenin, and low solubility parameter organic solven and SC-CO2 can extract more phytosterol (stigmasterol, β-sitosterol). Theolubility parameter of supercritical carbon dioxide will be affect by changing pressure and temperature. It decreases 4.4-13%/10oC at fixed pressure and increases 4.6-17.5%/1000 psi at fixed temperature.
Subjects
supercritical
yam
solubility parameter
Type
thesis
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