Abstract
To evaluated the effect of low temperature storage on quality of fresh shoot of Sedum sermentosum, weight loss, Hunter L, a and b value, chlorophyll, water content, and general appearance were investigated during storage at 20, 10, and $5^{\circ}C$. Just after harvesting, fresh shoots ($10{\pm}2cm$ length) were stored with wrap film (linear LDPE)-packaged condition using the Styrofoam dish ($20{\times}10cm$, which 40 fresh shoots per dish). The fresh weight of 40 shoots was gradually decreased according to days after storage and higher storage temperature. The weight loss of fresh shoots showed significant difference (8.7-25.3%) between just before storage and 10 days after storage, and the degree of weight loss was more severer in higher storage temperature. Wanju local strain showed the lowest weight loss, and the most severe case was Pohang local strain. SPAD value related to chlorophyll content was rapidly decreased after 4 and 6 days at 20 and $10^{\circ}C$ storage, respectively. It was slowly decreased according to days after storage at $5^{\circ}C$. Yellowish color in bottom leaves of shoot appeared after 4, 6 and 8 days at 20, 10, and $5^{\circ}C$ storages, respectively. Hunter L and a values were gradually increased after storage, and it showed significant difference between just before storage and 10 days after storage. The total rate of discoloration over 50% or decay shoot was largely increased as higher temperature. It was significantly correlated to the water content of fresh shoot among local strains $(P{\leq}0.01)$. The freshness of shoot after storage was maintained in order of Wanji, Gunsan, Wando and Pohang local strain. The results indicated that the freshness was maintained for 8 days after $5^{\circ}C$ storage, when the fresh shoot was stored with wrap film-packaged condition.
돌나물의 수확후 저장온도가 저장성에 미치는 영향을 분석하기 위하여 저장온도에 따른 생체중, 색상차, 엽록소 함량, 수분함량, 외관상 변화 등을 조사하였다. 생체중은 저장온도에 따라 8.7-25.3%의 감소를 보였으며, 저장온도가 높을수록 생체중 감소율도 높았다. 계통에 따른 생체중 감소는 포항지방종이 가장 컷으며, 완주 지방종의 변화가 비교적 적었다. 외관상 품질은 $20^{\circ}C$에서 4일경, $10^{\circ}C$에서 6일경, $5^{\circ}C$에서 8일경부터 하위 잎에 변색이 나타나기 시작하였으며, 시간이 지남에 따라 서서히 부패하기 시작하였다 SPAD 값으로 비교한 엽록소 함량은 $20^{\circ}C$와 $10^{\circ}C$에서는 4일과 6일 후부터 급격한 감소를 보였으나, $5^{\circ}C$에서는 변화가 적었다. 잎의 색도 변화에서 명도를 나타내는 L값과 녹색-적색을 나타내는 a값은 저장온도가 높을수록 저장일 수에 따라 유의하게 증가하였다. 저장 후 10일째에 변색이나 부패한 돌나물의 비율은 저장온도가 높을수록 증가하였으며, 이는 수확시의 수분함량과 유의한 상관 관계를 보였다(P=0.01). 계통간에는 완주 지방종이 비교적 저장성이 높았으며, 군산, 완도, 포항 순으로 부패율이 높았다. 따라서 돌나물을 스치로폼 접시에 랩포장 할 경우, $5^{\circ}C$에서는 수확 후 8일까지 상품성을 유지한 상태로 저장이 가능하였다.
