논문 상세보기
pp.714-718
매년 포도재배 농가에서 순따주기로 생산되나 버려지는 포도 잎의 이용도를 제고하기 위하여 조건을 달리하여 분말을 제조하여 그 특성을 조사하였다. 포도 잎의 건조에 따른 중량 감소율은 방법에 따른 차이 없이 76~80%로 나타났다. 색도는 진공 동결건조방법으로 건조한 포도 잎 분말이 열풍건조 시료보다 포도 고유의 색을 더 유지되었다. 포도의 기능성 성분인 레스베라트롤, 쿼세틴, 카테킨, 에피카테킨은 모든 품종의 잎에서 검출되었으며, 열풍건조에 비하여
Polyphenols are naturally occurring antioxidants and play many important roles in human health. Grape leaves have not yet been reported to contain the antioxidants. In this study, the physicochemical properties of powders from young grape leaves, obtained after hot-air or vacuum freeze drying, were analyzed. Weight loss rangedfrom 76-80%, but no difference was found between samples prepared by hot-air orvacuum freeze drying. The L-, a-, and b- values of grape powder all fell upon hot-air drying. Quercetin, resveratrol, catechin, and epicatechin were detected in all cultivars. The contents of the four polyphenols were generally higher in powders obtained by vacuum freeze dryingthan in those prepared by hot-air drying, indicating that vacuum freeze drying is better for optimal preservation of polyphenols. None of three polyphenols assayed was found in some cultivars or after certain drying treatments. Based on physiochemical properties, our findings suggest that powders obtained after vacuum freeze drying are optimal for industrial use.
