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KMID : 0352720070310040222
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Journal of Ginseng Research
2007 Volume.31 No. 4 p.222 ~ p.229
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Changes on Physicochemical Properties of Panax ginseng C. A. Meyer during Repeated Steaming Process
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Hong Hee-Do
Kim Young-Chan
Rho Jeong-Hae
Kim Kyung-Tack
Lee Young-Chul
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Abstract
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Changes on physicochemical properties of fresh Korean ginseng during repeated 9 times steaming processes, steaming 90~95oC for 1~3 hr followed by hot air-drying at 50oC for 36~48 hr, were investigated. The water contents decreased from 73.4% of fresh ginseng to 13.7% finally. The final yields in bases of total weights and dry matter were 21.0% and 79.0%, respectively. As the times of steaming processes increased, lightness (L value) decreased and redness (a value) increased in color of ginseng powder. Browning index also rapidly increased after 3 times of steaming process in particular. Total water soluble sugar contents decreased from 55.4% in fresh to 38.6% in final processed ginseng, but acidic polysaccharide contents increased by about 50% with increasing times of steaming process. Total phenolic compound contents significantly increased with repeated steaming processes especially after 5 times of steaming processes and crude saponin contents also increased in some degree. In the case of major ginsenosides, the contents of Rb₁, Rb₂, Rg₁, Re (representative ginsenosides in fresh ginseng) decreased, but those of Rg₂, Rh₁, Rg₃ (unique ginsenosides in red ginseng) increased after especially 5 times of steaming processes
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KEYWORD
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fresh ginseng, steaming process, physicochemical properties
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