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KMID : 0352720120360020198
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Journal of Ginseng Research
2012 Volume.36 No. 2 p.198 ~ p.204
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Increase in the Contents of Ginsenosides in Raw Ginseng Roots in Response to Exposure to 450 and 470 nm Light from Light-Emitting Diodes
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Park Sang-Un
Ahn Deok-Jong
Jeon Hyeon-Jeong
Kwon Tae-Ryong
Lim Hyoun-Sub
Choi Bo-Seong
Baek Kwang-Hyun
Bae Han-Hong
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Abstract
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An light-emitting diode (LED)-based light source was used as a monochromatic light source to determine the responses of raw ginseng roots (Panax ginseng Meyer) to specifi c emission spectra with respect to the production of ginsenosides. The ginsenoside content in the ginseng roots changed in response to the LED light treatments at 25°C relative to the levels in the control roots that were treated in the dark or at 4°C for 7 d. Ginseng roots were exposed to LEDs with four different peak emission wavelengths, 380, 450, 470, and 660 nm, in closed compartments. Compared with the control 4°C-treated roots, roots that were treated with 450 and 470 nm light showed a signifi cantly increased production of ginsenosides (p<0.05), with increases of 64.9% and 74.1%, respectively. The contents of the ginsenosides Rb2, Rc, and Rg1 were signifi cantly higher (p<0.05) in the 450 and 470 nm-treated root samples. The ratio of protopanaxadiol ginsenosides (Rb1, Rb2, Rc, and Rd) to protopanaxatriol ginsenosides (Rg1, Rg2, Re, and Rf) was signifi cantly higher (p<0.05) in the 450 and 470 nm-treated root samples than in the control 4°C-treated roots. This is the fi rst report that demonstrates the increase and conversion of ginsenosides in raw ginseng roots in response to exposure to LED light.
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KEYWORD
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Panax ginseng, Ginsenosides, Light-emitting diode,
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