• Journal of the Korean Society of Food Science and Nutrition
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• v.27 no.3
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• pp.406-412
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• 1998

Such extraction conditions as the kinds of solvent, extracting temperature, extracting time, ratio of material to solvent and particle size of material, were studied to maximize the extraction of oleoresin from chipi. Larger amount of soluble solids were extracted from seeds with nonpolar solvents (hexane, pentane, ether) for extraction, because the seeds contained large amount of crude fats and monoterpene(limonene) volatile compounds. Larger amount of soluble solids were extracted from peel with polar solvents(methanol, ethanol) of extraction because of large amount of water soluble colors, sugars and oxygenated terpene bolatile compounds in the peel. The application of the solvents in intermediate polarity (dichloromethane, acetone) resulted in more effective extraction of soluble solid and volatile compounds. Expecially, dichloromethane was an excellent solvent in extraction of volatile compounds. In the concern of volatile compound recovery yield, the optimum extraction conditions, such as temperature, time, mixing ratio of material to dichloromethane and mean particle size, were $25^{\circ}C$, 10min, 1:10(w/v), 355~250${\mu}{\textrm}{m}$ for chopi peels and 3$0^{\circ}C$, 10min, 1:8(w/v), 355~250${\mu}{\textrm}{m}$ for chopi seeds, respectively.

• Food Science and Preservation
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• v.7 no.3
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• pp.273-277
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• 2000

Some fundamental conditions were investigated in microwave-assited extraction (MAE) for oleoresin from Chinese dried ginger. The fifty watts of microwave energy(2,450 MHz), 60 mesh in particle size and 1:10 (g/mL) ratio of sample to solvent were the optimum conditions. Lower yield of soluble oleoresins was obtained at higher concentrations of ethanol. Radical scavenging ability was highest in extracts by using 25% of ethanol. Total phenolics in extracts were remarkably increased at above 50% of ethanol concentration. Overall yield of oleoresin components increased in proportional to extraction time up to 7 min. Based on the above results, it is indicated that ethanol concentration is a critical parameter in MAE.