탈지난황을 이용한 단백가수분해물 제조 및 항산화 활성 평가
Enzymatic preparation and antioxidant activities of protein hydrolysates from defatted egg yolk
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초록
본 연구에서는 탈지난황을 활용한 항산화 소재 개발 가능성을 탐색하기 위해 탈지난황 단백가수분해물을 제조하고 항산화 활성을 평가하였다. 4종의 단백질 가수분해 효소(alcalase, bromelain, flavourzyme, neutrase)를 처리한 후 시간에 따른 각 효소별 가수분해도를 확인한 결과, 효소 처리군의 가수분해도가 비처리군에 비하여 전반적으로 높았으며, 특히 DEYA가 가장 높은 가수분해도를 보였다. 각 효소와 12시간 반응시켜 제조한 효소별 단백가수분해물의 ROS 소거 활성을 평가하기 위해 ABTS radical 및 H2O2 소거 활성 실험을 진행한 결과, DEYA가 다른 가수분해물에 비해 유의적으로 높은 항산화 활성을 보이는 것으로 확인되었다. 이상의 실험을 기반으로 효소별 단백가수분해물 중 가장 높은 가수분해도와 항산화 활성을 보였던 DEYA를 상온에 보관하며 항산화 안정성 평가를 진행한 결과, DEYA는 L-ascorbic acid와 녹차 추출물 대비 월등히 우수한 안정성을 보였으며, 28일 차까지도 90% 이상의 항산화 활성을 유지하였다. 또한, DEYA는 난백 단백가수분해물, 갈색거저리 유충 그리고 탈지대두와의 ABTS radical 소거 활성 비교 실험을 진행한 결과에서도 유사하거나 상대적으로 우수한 활성을 보였다. 최종적으로 본 연구에서는 산업적으로 이용되고 있는 lecithin 추출 공정과 효소적 가수분해를 통해 제조한 탈지 난황 단백가수분해물의 우수한 항산화 활성을 확인할 수 있었다. 이는 향후 항산화 기능성을 가진 기능성 식품과 식품첨가물 개발을 위한 기초 연구 자료로서 활용될 수 있을 것으로 기대된다.
Abstract
This study aimed to investigate the characteristics of protein hydrolysates derived from defatted egg yolk using various proteolytic enzymes and compare the antioxidant activity of the resulting hydrolysates. The defatted egg yolk powder was subjected to enzymatic hydrolysis using four different proteases (alcalase, bromelain, flavourzyme and neutrase), and the resulting hydrolysates were evaluated for their antioxidant properties. Through analysis of available amino group contents and sodium dodecyl sulfate-polyacrylamide gel electrophoresis, it was observed that the defatted egg yolk powder treated with alcalase, flavourzyme, and neutrase for 12 h exhibited a high degree of hydrolysis value. Based on the RC50 values obtained from two different antioxidant analyses, all hydrolysates showed comparable antioxidant activity, except for the alcalase hydrolysate, which demonstrated notably higher scavenging activity against hydrogen peroxide than the other hydrolysates. These findings suggest the potential of protein hydrolysates from defatted egg yolk, a by-product of lecithin extraction, as natural antioxidants.
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