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Background : Polygonati rhizoma is used for medicine using rhizome of Polygonatum sibiricum Redoute belonging to Liliaceae. This study was carried out to find proper method to establish the guideline of GAP post-harvest management.
Methods and Results : Six-years-old polygonati rhizoma harvested in march in Geumsan was used for this study. Steaming was treated for 1, 2, and 3 hours respectively and drying was treated at 45℃, 50℃, 55℃, and 60℃ using hot-air drying machine with checking moisture content at intervals of a day. Moisture contents of polygonati rhizoma according to drying temperature after steaming showed that drying was faster in higher drying temperature treatment after steaming. Moisture content was below 10% as 9.6% and 9.4% at 55℃ drying treatment after steaming for 1 hour and 2 hours respectively. Color value according to treatments was as follows, L-value was lower in longer steaming and higher drying temperature. a-Value was higher in steaming an higher drying temperature.
Conclusion : In steaming and hot-air drying treatment to establish the guideline of GAP post-harvest management, moisture content was most proper as 9.4% below 10% in 2-hour steaming and 55℃ hot-air drying for 6 days. L-value was 27.49 and a-value and b-value were 4.38 and 9.73 in this treatment and dried rhizome looked glossy and transparent with higher quality. Proper drying method for polygonati rhizoma was considered as 2-hour steaming and 55℃ hot-air drying for 6 days.
