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KMID : 0352720070310040230
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Journal of Ginseng Research
2007 Volume.31 No. 4 p.230 ~ p.236
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Changes of phenolic acid contents and radical scavenging activities of ginseng according to steaming times
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Kim Young-Chan
Hong Hee-Do
Rho Jeong-Hae
Cho Chang-Won
Rhee Young-Kyoung
Yim Joo-Hyuk
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Abstract
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This study was conducted to investigate the contents of the total phenolic compounds, and DPPH, ABTS radical scavenging activities of phenolic acid fractions of ginseng according to steaming times. Also the individual phenolic acid compositions and contents were analyzed by GC. The contents of the total phenolic compounds proportionally increased from 0.530 to 2.893% according to steaming times. Phenolic acid fractions were separated according to bound types, and the insoluble bound form fraction showed the highest contents followed by ester form fraction and free form fraction. The total contents of these three fractions (1.031-1.416%) were not significantly influenced by steaming times. Salicylic, cinamic, p-hydroxybenzoic, gentisic, vanillic, syringic, caffeic, ferulic acid were found in each fraction, and gentisic and ferulic acid were the major phenolic acid. Each phenolic acid fraction showed over 50% of DPPH and ABTS radical scavenging activities. There were no differences between the phenolic acid fractions according to binding types. Free radical scavenging activities were affected by a number of steaming times and augmented as steaming times increased.
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KEYWORD
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Korean ginseng, steaming, phenolic acid, antioxidant activity
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