Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Quality Characteristics and Antioxidant Activities of Rehmanniae radix Paste

지황 및 숙지황 농축 페이스트의 이화학적 품질 및 항산화 특성

  • Oh, Hye-Lim (Dept. of Food & Nutrition, Chungnam National University) ;
  • You, Bo-Ram (Dept. of Food & Nutrition, Chungnam National University) ;
  • Kim, Hyo-Jin (Dept. of Food & Nutrition, Chungnam National University) ;
  • Lee, Ji-Yeon (Dept. of Food & Nutrition, Chungnam National University) ;
  • Kim, Na-Yeon (Dept. of Food & Nutrition, Chungnam National University) ;
  • Song, Jung-Eun (Dept. of Food & Nutrition, Chungnam National University) ;
  • Kim, Mee-Ree (Dept. of Food & Nutrition, Chungnam National University)
  • 오혜림 (충남대학교 식품영양학과) ;
  • 유보람 (충남대학교 식품영양학과) ;
  • 김효진 (충남대학교 식품영양학과) ;
  • 이지연 (충남대학교 식품영양학과) ;
  • 김나연 (충남대학교 식품영양학과) ;
  • 송정은 (충남대학교 식품영양학과) ;
  • 김미리 (충남대학교 식품영양학과)
  • Received : 2011.08.25
  • Accepted : 2011.10.25
  • Published : 2011.11.30
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Abstract

This study was investigated the quality characteristics and antioxidant activities of the Rehmanniae radix (Rehmannia glutinosa Libosch. var. purpurea Makino) paste (RRP) and Rehmanniae radix preparata extract (RRPP). RRP and RRPP were made from vacuum concentrates of hot water extracts. The sugar contents of RRP and RRPP were 65.3 and 72.0$^{\circ}Brix$, respectively, whereas the reducing sugar contents were 2.4% and 44.9%. The pH level was lowest in the RRPP. The DPPH and hydroxyl radical scavenging activity of RRPP were much higher than those of RRP. Total phenol contents of RRP and RRPP were 2.15 mg/mL and 12.36 mg/mL, respectively. FRAP values of RRP and RRPP were 0.55 mg/mL and 2.02 mg/mL, respectively. Based on these results, it can be concluded that RRPP was the most appropriate in terms of both physicochemical and antioxidative activities.

본 연구에서는 생지황과 숙지황 물 추출물을 감압농축 시킨 페이스트를 만들어 이화학적 특성과 항산화능을 분석하였다. 명도는 생지황 농축 페이스트보다 숙지황 농축 페이스트가 낮았다. 적색도는 생지황 농축 페이스트가 1.3으로 숙지황 농축 페이스트보다 높게 측정되었다. 황색도는 생지황 농축 페이스트가 0.68로 숙지황 농축 페이스트보다 높게 측정되었으며, 색도는 각 시료간의 유의적인 차이를 나타내었다(p<0.05). 당도는 숙지황 농축 페이스트가 72.0$^{\circ}Brix$를 나타내어 더 높게 나타났고, 환원당 함량 또한 숙지황 농축 페이스트가 44.9%로 더 높게 나타났다. pH는 숙지황 농축 페이스트의 pH가 4.1을 나타내어 생지황 농축 페이스트의 pH인 5.6보다 낮았다. 일반성분 분석에서 조단백은 숙지황 농축 페이스트에서 3.3%, 생지황 농축 페이스트에서 2.0%로 나타나 숙지황 농축 페이스트에서 더 높게 나타났다. 유효성분 분석에서 catalpol 함량은 생지황 농축 페이스트에서 183.1 mg/mL로 검출되었고 숙지황 농축 페이스트에서는 검출되지 않았으며, 5-HMF는 숙지황 농축 페이스트에서만 검출되었다. 총 phenol 함량 측정 결과 숙지황 농축 페이스트가 12.36 mg/mL로 현저히 높은 함량을 나타내었고 DPPH radical 소거능 측정 결과 $IC_{50}$ 값이 생지황 농축 페이스트, 숙지황 농축 페이스트의 순으로 감소하여 숙지황 농축 페이스트의 항산화능이 더 높게 나타났다. Hydroxyl radical 소거능 측정 결과 $IC_{50}$ 값은 숙지황 농축 페이스트의 값이 1.45 mg/mL로 더 낮게 나타나 숙지황 농축 페이스트의 항산화능이 더 높게 나타났고, FRAP 활성 측정 결과 또한 숙지황 농축 페이스트가 2.02 mg/mL로 더 높아 항산화능이 더 높게 나타났다. 관능검사 결과, 숙지황 농축 페이스트의 선호도가 더 높은 것으로 나타났다. 이러한 결과로 보아 지황의 농축페이스트 중에서 식품소재로 활용될 때 숙지황 농축 페이스트가 더 적당한 것으로 사료된다.

Keywords

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