Application of the microwave-assisted process (MAP) to the fast extraction of ginseng saponins
2003
Kwon, J.H. | Belanger, J.M.R. | Pare, J.R.J. | Yaylayan, V.A.
Due to the importance of saponin content in ginseng extracts, the microwave-assisted process (MAP) was compared to the conventional extraction methods in terms of the extraction time, yield, quality and the nature of ginsenosides extracted. For comparison of the two techniques, all extraction parameters (solvent, sample to solvent ratio, temperature, etc.) were kept the same; the microwave extractor was operated at 300 W with an emission frequency of 2450 MHz under atmospheric pressure conditions and the extractions were carried out at 72.2 degrees C for 30 s (4 x), while the conventional reflux was at 75 +/- 1 degrees C for 3 h (4x). Total yield and crude saponin content were determined gravimetrically and chromatographically (TLC, HPLC) and compared with the accreditation values. Results indicated that the MAP was comparable to the conventional method in its capability to extract target components without causing any degradation, in addition it dramatically reduced the extraction time from 12 h to a few seconds, suggesting that it can be an alternative technique to the time-consuming conventional reflux method.
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