Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Pilot Plant Scale Extraction and Concentration of Purple-Fleshed Sweet Potato Anthocyanin Pigment

자색고구마 anthocynin 색소의 대량추출 및 농축

  • Rhim, Jong-Whan (Department of Food Engineering and Food Industrial Technology Research Center, Mokpo National University) ;
  • Lee, Jang-Wook (Department of Food Engineering and Food Industrial Technology Research Center, Mokpo National University) ;
  • Jo, Jae-Sun (Department of Food Engineering, Kyung-Hee University) ;
  • Yeo, Kyeong-Mok (S&D Co., Ltd.)
  • 임종환 (목포대학교 식품공학과 및 식품산업기술연구센터) ;
  • 이장욱 (목포대학교 식품공학과 및 식품산업기술연구센터) ;
  • 조재선 (경희대학교 식품공학과) ;
  • 여경목 ((주) S&D)
  • Published : 2001.12.01
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Abstract

Performance of pilot plant scale extraction and concentration of purple-fleshed sweet potato anthocyanin pigment was tested and the characteristics of pigment extracts and concentrates were investigated. Fifty kilograms of purple-fleshed sweet potato was extracted with 500 L of 1% citric acid in 20% ethanol. As a whole, extraction pattern of the large scale extraction was similar to that of the laboratory scale extraction. The extracted pigment solution was filtered twice with a bag filter and a winding type microfilter and the filtrate was concentrated by a large scale vacuum evaporator at $40^{\circ}C$ and 600 mmHg vac. The mean values of total optical density (TOD) of the extract and the concentrate were 6.53 and 120.45, respectively. Browning index (BI) and Degradation index (DI) of extract were 5.86 and 1.55 and those of concentrate were 5.89 and 1.56, respectively, which indicated that the pigments were not changed or degraded through the extraction and concentration process.

자색고구마로부터 anthocyanin색소를 대규모로 추출 및 농축하여 색소의 추출효과 및 색소액의 품질을 조사하였다. 자색고구마 원료 50 kg에 1% citric acid를 함유한 20% ethanol용액 500 L를 가하여 추출하였으며, bag filter와 pore size $1{\mu}m$인 microfilter를 이용하여 2단계로 여과한 후 $40^{\circ}C$, 진공도 600 mmHg에서 감압농축하였다. 전반적으로 대규모 추출시의 색소의 추출양상은 실험실규모의 소규모 추출의 경우와 유사하였다. 추출된 색소액의 TOD는 6.53이었으며, 농축액의 TOD는 120.45으로 18.45배 농축되었다. 색소추출액의 BI와 DI는 각각 5.86, 1.55이었으며 농축액의 BI와 DI는 각각 5.89, 1.56으로 농축과정 중에 색소의 변색이나 변질이 없었다. 색소추출액의 pH는 2.9이었으며 농축액의 pH는 2.5로 감소하였다.

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