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논문 상세정보

흑미 미강으로부터 안토시아닌의 최적 추출 조건 및 안토시아닌 추출 분말의 저장 안정성

Optimal Conditions for Anthocyanin Extraction from Black Rice Bran and Storage Stability of Anthocyanin Extract

초록

농업 부산물인 흑미 미강으로부터 식품 원료로 활용하기 위한 안토시아닌을 최적으로 추출하기 위하여 추출 조건을 평가하였다. 흑광 품종 미강의 안토시아닌을 분석한 결과 주요 안토시아닌 성분은 cyanidine-3-glucoside(C3G)인 것으로 조사되었다. 흑미 미강의 안토시아닌을 추출하기 위하여 추출 용매, 추출 온도, 추출 시간에 따라 추출 분말의 수율 및 C3G 함량을 분석한 결과 흑미 미강은 50% 에탄올 용매, $70^{\circ}C$, 2시간 추출에서 안토시아닌이 최적으로 추출되는 것으로 평가되었다. 흑미 미강으로부터 최적 조건에서 추출된 안토시아닌 분말을 식품 원료로서 안정성을 평가하기 위하여 저장 온도($-20^{\circ}C$, $4^{\circ}C$, 실온)와 기간(168일)에 따라 색차와 C3G 함량의 변화를 측정하였다. 흑미 미강에서 추출한 안토시아닌 분말의 색차는 명도(L), 적색도(a), 황색도(b) 모두 저장 기간이 늘어남에 따라 증가하는 경향을 나타내었으며, 저장 온도가 높을수록 증가폭이 크게 나타났다. 반면 안토시아닌 분말의 C3G 함량은 저장 기간이 늘어남에 따라 서서히 감소하여 안토시아닌 함량과 색도 간에 유의한 부의 상관관계를 나타내었다. 흑미 미강의 안토시아닌 분말은 저장 168일 후에도 모든 저장 온도에서 C3G 함량이 초기 함량의 90% 이상을 유지하여 매우 안정한 것으로 확인되었다. 안토시아닌이 풍부하며 저장 안정성이 높은 흑미 미강의 추출 분말은 식품 산업에서 천연색소 및 기능성 원료로서 활용 가치가 매우 높을 것으로 기대된다.

Abstract

Black rice bran, a by-product from rice milling process, is a good natural source of anthocyanin pigment. The purpose of this study was to determine the optimum conditions for anthocyanin extraction from black rice bran as well as the stability of anthocyanin extract according to different storage temperatures. The main anthocyanin in 'Heugkwang' rice bran was identified as cyanidine-3-glucoside (C3G) by HPLC and LC-MS/MS. The yield and C3G content of black rice bran extract were investigated with various extraction solvents, temperatures, and times. The results indicate that the optimum extraction solvent, temperature, and time were 50% ethanol, $70^{\circ}C$, and 2 h, respectively. The stability of anthocyanin extract was studied during a storage period of 168 days at various temperatures ($-20^{\circ}C$, $4^{\circ}C$, and room temperature). Hunter's values (L, a, and b) of anthocyanin extract increased, whereas C3G content continuously decreased up to 168 days. Variations in Hunter's values and C3G content become larger as storage temperature increased. Anthocyanin extract from black rice bran was very stable, as C3G content after storage at all temperatures was maintained at more than 90% of initial content. These results suggest that anthocyanin extract from black rice bran may be useful as a natural food colorant.

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