Korean Journal of Medicinal Crop Science (한국약용작물학회지)

The Korean Society of Medicinal Crop Science (한국약용작물학회)
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Physicochemical Characteristics of Rehmanniae Radix Preparata Powder by Milling with Pre-freezing Temperatures

예비동결 온도에 따른 숙지황 분말의 이화학적 특성

  • Jang, Gwi Yeong (Department of Herbal Crop Research, NIHHS, RDA) ;
  • Park, Chan Hum (Department of Herbal Crop Research, NIHHS, RDA) ;
  • Choi, Jehun (Department of Herbal Crop Research, NIHHS, RDA) ;
  • Yoon, Ji Hye (Department of Herbal Crop Research, NIHHS, RDA) ;
  • Shin, Yu Su (Department of Herbal Crop Research, NIHHS, RDA) ;
  • Jeong, Heon Sang (Department of Food Science and Biotechnology, Chungbuk National University) ;
  • Kim, Dong Hwi (Department of Herbal Crop Research, NIHHS, RDA)
  • 장귀영 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 박찬흠 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 최재훈 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 윤지혜 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 신유수 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 정헌상 (충북대학교 식품생명공학과) ;
  • 김동휘 (농촌진흥청 국립원예특작과학원 인삼특작부)
  • Received : 2017.12.04
  • Accepted : 2018.01.15
  • Published : 2018.02.28
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Abstract

Background: Rehmanniae radix preparata (RRP) has been used as a traditional medicine and is one of the most important oriental herbal medicines. However, the physical characteristics of RRP are not suitable for use in industry. The present study was under-taken to determined the preparation method of RRP powder and the physicochemical characteristics of RRP powder by milling under different pre-freezing temperatures. Methods and Results: Moisture content, powder yield, particle size, bulk density, compressive stress, extraction yield, and 5-HMF content of PRR powders by milling with pre-freezing temperatures (-20, -40, -60, and $-80^{\circ}C$) were analyzed, and correlation among these factors was determined. Powder yield increased and particle size decreased in a pre-freezing temperature-dependent manner from -20 to $-60^{\circ}C$. The Hausner ratio increased from 1.186 to 1.225 with decreasing temperature from -20 to $-80^{\circ}C$, whereas compressive stress showed the opposite trend. Extraction yield and 5-HMF content were not significantly different between RRP powder. Significant correlations were observed among pre-freezing temperature and physical characteristics (e.g., yield, particle size, Hausner ratio, and compressive stress). Conclusions: These results suggest that the pre-freezing temperature is an important factor affecting the physical characteristics of PRR powder and applicable to the industrial production of RRP powder.

Keywords

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