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Changes in saponin composition and microstructure of ginseng by microwave vacuum drying were determined. Korean fresh ginsengs were subjected to four different processing : 3 min microwave vacuum drying and 2 min holding-24 hrs drying (MWVD1), 5 min microwave vacuum drying and 2.5 min holding-24 hrs...

Changes in saponin composition and microstructure of ginseng by microwave vacuum drying were determined. Korean fresh ginsengs were subjected to four different processing : 3 min microwave vacuum drying and 2 min holding-24 hrs drying (MWVD1), 5 min microwave vacuum drying and 2.5 min holding-24 hrs drying (MWVD2), 3 min microwave vacuum drying and 2 min holding-12 hrs drying after hot air drying for 12 hrs drying at $45^{\circ}C$ (HMWVD1), 5 min microwave vacuum drying and 2.5 min holding-12 hrs drying after hot air drying for 12 hrs at $45^{\circ}C$ (HMWVD2). The water content was decreased until 16.82% without shrinkage and water activity was 0.54 after microwave vacuum drying. The lipid content was decreased after microwave vacuum drying (MVD). Glucose was increased after MVD while sucrose decreased. Ginsenoside-Rb1 and ginsenoside-Rc were decreased after MVD. Ginsenoside-Rg1 for MWVD2 and HMWVD2 was higher than that of MWVD1 AND HMWVD1. MWVD1 AND HMWVD1 dried ginsengs showed a more compact structure than the HMWVD2 and HMWVD2 ginsengs.

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