자색케일(Brassica oleracea L. var. acephala) 안토시아닌 색소의 안정성에 영향을 미치는 요인
Factors affecting stability of anthocyanin pigment extracted from red kale (Brassica oleracea L. var. acephala)
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본 연구는 처리조건에 따른 자색케일 안토시아닌의 색소 안정성을 조사하였다. 자색케일 용액은 pH 1.0에서 가장 안 정적이었으며, 높은 흡광도 값을 보였다. 0.05 M의 유기산을 첨가한 자색케일 용액을 10일간 저장 시 malic acid, formic acid, acetic acid, citric acid 순으로 높은 색소잔존율을 보였 다. 저장 기간별 금속이온에 대한 안정성을 측정한 결과, K+, Mg2+, Ca2+, Na+, Fe2+ 순으로 높은 색소 잔존율을 보였다. 열 처리에 따른 안정성을 측정한 결과, 온도가 낮을수록 색소가 안정적임을 확인하였다. 0.1 M의 당을 첨가한 자색케일 용액 을 6일간 저장 시 glucose, maltose, sucrose, galactose, fructose 순으로 높은 색소 잔존율을 보였다. 빛과 암소 조건에 서 색소 안정성을 측정한 결과, 일광에 노출하였을 때보다 암 소 조건에서 색소가 안정적임을 확인하였다. 저장온도에 따른 색소 안정성을 측정한 결과, -40℃, -20℃에서 비교적 안정적 이었으나, 37℃에서는 저장기간에 따라 색소가 감소하는 경향 을 보였다. 본 연구에 의하면 자색케일의 안토시아닌 색소는 처리조건에 따라 색소 안정성의 차이를 보이므로, 천연색소로 활용할 경우 색소 안정성에 유의할 필요가 있다고 생각된다.
Abstract
This study examined the pigment stability of red kale anthocyanin according to different conditions. The red kale extract was the most stable at pH 1.0 showing high absorbance at 538 nm. When a 0.05 M organic acid solution was added to the red kale extract, which was then stored for 10 days, the pigment retention rates were observed in the order of malic > formic > acetic > citric acids. When measuring the stability in the presence of metal ions, the pigment retention rates were observed in the order of K+ > Mg2+ > Ca2+ > Na+ > Fe2+. The stability based on heat treatment was confirmed that the lower the temperature, the more stable the color. When 0.1 M sugar solution was added to the red kale extract, which was then stored for 6 days, the pigment retention rates were observed in the order of glucose > maltose > sucrose > galactose > fructose. The color was more stable in darkness than upon exposure to sunlight. The color was relatively stable at -40℃ and -20℃, but at 37℃, color stability decreased. In conclusion, the anthocyanin pigment of red kale showed different color stability depending on the processing conditions, and these should be considered when using it as a natural pigment.
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