The aging treatment was applied to Rehmannia glutinosa rhizome (RGR) to improve the digestibility by the enzymatic hydrolysis of undigestible sugars. However, RGR spoils easily during the aging treatment. Thus, the purpose of this study was to investigate the influence of ethanol addition as preservatives on sugars and microbial growth of aged RGR. The RGR was treated with the addition of ethanol (0~10%) at 55℃ for eight days. Reducing, free sugars, and total bacterial counts of RGR with ethanol concentrations were analyzed during the aging periods. The aged RGR with 0-2% ethanol appeared spoiled in appearance, and total bacterial counts of these samples increased from 1.1×105 to 2.2×107 CFU and then decreased again. When treated with 4~10% ethanol, the total bacterial counts of aged RGR decreased by more than 99.9% at eight days. In all samples, reducing and digestible sugars increased, and stachyose decreased by the aging treatment. Sucrose content was highest in the 6% ethanol sample (18.2% at six days). These results indicate that the ethanol addition can be applied to the aging treatment of the RGR for improving qualities (sweetness, digestibility, and microbial growth), and can be considered for the stable production of high quality aged RGR.

Abstract
서 론
재료 및 방법
    1. 지황 전처리 및 숙성처리 온도 설정
    2. 에탄올 첨가량별 숙성지황 제조
    3. 총생균수 측정
    4. 총산도 측정
    5. 환원당 함량 측정
    6. 유리당 함량 측정
    7. 통계분석
결과 및 고찰
    1. 숙성 온도에 따른 지황의 환원당 함량
    2. 에탄올 첨가량 및 숙성 기간에 따른 숙성지황의 총생균수 및 총산도
    3. 에탄올 첨가량 및 숙성 기간에 따른 숙성지황의 유리당 조성
요약 및 결론
References

• 장귀영(국립원예특작과학원 인삼특작부) | Gwi Yeong Jang (Dept. of Herbal Crop Research, NIHHS, RDA)
• 최재훈(국립원예특작과학원 인삼특작부) | Je Hun Choi (Dept. of Herbal Crop Research, NIHHS, RDA)
• 김형돈(국립원예특작과학원 인삼특작부) | Hyung Don Kim (Dept. of Herbal Crop Research, NIHHS, RDA)
• 서경혜(국립원예특작과학원 인삼특작부) | Kyung Hye Seo (Dept. of Herbal Crop Research, NIHHS, RDA)
• 이승은(국립원예특작과학원 인삼특작부) | Seung Eun Lee (Dept. of Herbal Crop Research, NIHHS, RDA)
• 지윤정(국립원예특작과학원 인삼특작부) | Yun Jeong Jee (Dept. of Herbal Crop Research, NIHHS, RDA)
• 강민혜(국립원예특작과학원 인삼특작부) | Min Hye Kang (Dept. of Herbal Crop Research, NIHHS, RDA)
• 김동휘(국립원예특작과학원 인삼특작부) | Dong Hwi Kim (Dept. of Herbal Crop Research, NIHHS, RDA)
• 최수지(국립원예특작과학원 인삼특작부) | Su Ji Choi (Dept. of Herbal Crop Research, NIHHS, RDA) Corresponding author