수확 시기가 포도 과실품질 및 페놀계 화합물 함량에 미치는 영향
Effect of Harvest Time on the Several Phenolic Compounds and Fruit Quality of Grape Cultivars
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초록
본 연구에서는 수확시기에 따른 과실품질과 폴리페놀화합물인 에피카테킨, 카테킨, 레스베라트롤, 쿼세틴 함량에 미치는영향을 구명하고자 본 연구를 실시하였다. 포도의 특성과 품질은 수확 시기에 관계없이 만기 수확구에서 과실특성이 향상되었고, 당도는 높고 산도는 낮았다. 명도(L)는 ‘캠벨얼리’와 ‘자옥’에서 적색도(a)는 ‘자옥’에서 만기 수확구에서 높았으며, 황색도(b)는 ‘자옥’에서 수확시기에 따라 높은 차이를 보였다. 에피카테킨 중 EC는 모두 만기 수확구에서 높았으며, ‘자옥’ 품종은 EGC와, EC가 수확시기에 따라 함량 차이가 뚜렷하였으며,품종에 따라 에피카테킨 조성이 달랐다. 카테킨, 레스베라스톨은 ‘캠벨얼리’와 ‘M.B.A’는 만기 수확구에서, ‘자옥’은 조기 수확구에서 높았으며, 쿼세틴은 ‘캠벨얼리’는 조기 수확구에서 ‘자옥’과 ‘M.B.A’는 만기 수확구에 높았다. 품종별로는 ‘캠벨얼리’가 수확시기와 관계없이 ‘자옥’과 ‘M.B.A’에 비하여 카테킨과 레스베라스톨이 높았다.
Abstract
This study was accomplished to investigate the effect of harvest time on the contents of polyphenolic compounds such as epicatechin, catechin, resveratrol and quercetin in grapes (Vitis spp.). The souble solids contents were increased with harvest time delay, while the titratable acidity continuously decreased in all cultivars. Brightness (L) was higher in ‘Campbell Early’ and ‘Shigyoku’, Hunter a value was high in ‘Shigyoku’ which was harvested later. Hunter b value seemed to be different in ‘Shigyoku’ depending on harvesting time. The contents of EC which was extracted ‘Campbell Early’, ‘Shigyoku’ and ‘M.B.A’ were higher late harvest time than early harvest time, reapectively, In ‘Shigyoku which requires the direct light, the contents of EGC and EC showed distinct differences depending on harvesting time. The compositions of epicatechin were different depending on cultivars. The contents of catechin and resveratrol were higher in ‘Campbell Early’ and ‘M.B.A’ which were harvested later, but ‘Shigyoku’ which was harvested earlier. The contents of quercetin was higher in ‘Campbell Early’ which was harvested earlier, but ‘Shigyoku’ and ‘M.B.A’ which were harvested later. In comparison with ‘Shigyoku’ and ‘M.B.A’, catechin and resveratrol contents were seen to be higher in ‘Campbell Early’ irrespective of harvesting time.
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