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Pulsed Electric Fields Effects on Drying of White Ginseng and Extraction of Soluble Components

백삼의 건조와 가용성 성분 추출에 미치는 pulsed electric fields(PEF)의 효과

  • Received : 2012.06.28
  • Accepted : 2012.09.20
  • Published : 2012.12.31

Abstract

This study was designed to investigate the effect of pulsed electric fields on the drying of ginseng and extraction of dried ginseng to reduce energy-consumption. Fresh ginseng was treated in a PEF system of 1 and 2 kV/cm electric field strength, 25 and 200 Hz of frequency, $30{\mu}s$ of pulse width and pulse number of 175. The samples were subsequently dried for 26 h at $55{\pm}1^{\circ}C$, and the characteristic of hot-water extraction on dried ginseng was investigated. The ginseng pretreated with an intensity of 2 kV/cm (200 Hz, n=175) resulted in a reduction of approximately 38% for drying time. The influence of PEF treatment on the water extraction of dried ginseng at $95{\pm}1^{\circ}C$ was also investigated. The application of an electric field intensity of 2 kV/cm (25 and 200 Hz, n=175) increased soluble solid content, significantly reducing sugar content and free sugar content of the extract compared to non-PEF-treated samples.

Keywords

pulsed electric field;drying;ginseng;extraction;energy saving

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