Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Quality characteristics of Pueraria thunbergiana extracts depending on drying methods

건조방법에 따른 칡 추출물의 품질특성

  • Kwon, Yu-Ri (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Nam, San (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Jeong, Da Som (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Kwon, Ri Eun (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Youn, Kwang-Sup (Department of Food Science and Technology, Catholic University of Daegu)
  • 권유리 (대구가톨릭대학교 식품공학전공) ;
  • 남산 (대구가톨릭대학교 식품공학전공) ;
  • 정다솜 (대구가톨릭대학교 식품공학전공) ;
  • 권리은 (대구가톨릭대학교 식품공학전공) ;
  • 윤광섭 (대구가톨릭대학교 식품공학전공)
  • Received : 2016.07.06
  • Accepted : 2016.08.29
  • Published : 2016.10.30
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Abstract

This study was designed to compare the quality characteristics of spray-dried (SD) and freeze-dried (FD) Pueraria thunbergiana extracts powder hot water extracts. Quality characteristics of the SD and FD powder including moisture content, color value, water absorption index, water solubility index, dynamic angle and antioxidant activities were evaluated. The moisture content of SD powder (1.50%) was lower than that of FD powder (2.92%). $L^*$ and $b^*$ values of SD powder was lower than of FD powder. The water absorption index was higher in FD powder (1.40) and water solubility index in SD powder (94.10%) was higher than that FD powder (90.69%). Dynamic angle of SD powder ($36.46^{\circ}$) was higher than that of FD powder ($33.30^{\circ}$). The DPPH radical scavenging activities of 5 mg/mL solution of SD powder and FD powder were 85.38 mg/mL, 59.38 mg/mL, respectively. And, the same trend was observed for the ABTS radical scavenging activities of the drying powder as that observed for their DPPH radical scavenging activities. There were relatively higher contents of phenolic compounds in SD powders than in FD powders. In conclusion, spray-dried Pueraria thunbergiana extracts showed the high WSI, polyphenol, DPPH and ABTS radical scavenging activities and low moisture content and dynamic angle than freeze dried powder.

칡의 활용성 증대 및 식품 소재로 개발하기 위하여 칡을 열수추출 한 후 추출물을 분무 및 동결건조를 실시하여 칡 추출분말의 품질특성을 조사하였다. 건조방법을 달리한 칡 추출분말의 색도는 분무건조 분말에서 명도와 황색도는 낮고 적색도는 높았다. 수분흡수지수는 동결건조 분말이 1.40~1.41로 분무건조에 비해 높았고, 수분용해지수는 분무건조가 94.10%로 높았으나 안식각을 측정한 결과 분무건조 분말이 동결건조 분말에 비해 응집력 및 흐름성을 가지는 것을 확인하였다. 한편, 칡 추출분말의 총 폴리페놀 및 플라보노이드 함량은 분무건조가 각각 18.09 mg/g, 13.42 mg/g으로 동결건조 보다 높은 함량을 나타내었으며, DPPH 및 ABTS 라디칼 소거활성에서는 전체적으로 농도 의존적으로 증가하는 경향을 나타내었으며 모든 농도에서 분무건조 분말의 라디칼 소거활성이 높았고 특히 DPPH 라디칼 소거활성 경우 분무건조가 85.38%, 동결건조가 59.38%로 분무건조 분말이 높은 소거활성을 보였다. 이러한 결과를 종합해 볼 때, 칡 추출분말 제조 시 분무건조 분말이 동결건조 분말에 비하여 가공적성 및 항산화 활성이 우수하여 가공 산업의 활용도가 높을 것으로 판단된다.

Keywords

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