수확 전후 칼슘-키토산 처리에 따른 다래의 저장성 변화
Effect of Pre- or Post-harvest Treatment of Calcium-chitosan on Fruit Quality of Hardy Kiwifruit
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초록
본 연구에서는 다래‘대성’과실의 수확 후 품질 보구력과 저장성 증진에 대한 효과를 살펴보고자 칼슘-키토산을 수확 전후 처리 하였다. 수확 전 처리는 8월 20일, 25일, 28일 3회에 거쳐 과실에 살포처리하였고, 수확 후 처리는 8월 31일 수확한 건전한 과실을 선별하여 침지 처리하였다. 처리한 과실은1℃와 17℃ 온도 조건에 저장 하여 시기별로 가용성 고형물 함량, 산함량, 경도, 호흡률, 에틸렌발생량,감모율을 조사하여 과실 품질을 평가하였다. 두 온도 조건에서 수확전후 칼슘-키토산 처리는 과피에 대한 코팅효과에 의해 감모율 억제효과를 보였다. 17℃ 저장조건에서는 감모율 이외의 품질지표에서는 처리간의 유의적인 차이가 없었으나, 1℃ 저장조건에서는 감모율 이외에도 경도와 호흡률에서 칼슘-키토산 수확 전후처리가 과실 후숙을 억제하는 효과가 있음을 확인 하였다.
Abstract
This study was focused to examine the effects of pre- or post-harvest Ca-chitosan treatmenton the shelf-life of ‘Daesung’ hardy kiwifruit. In the preharvest treatment, Ca-chitosan at 200mg/L was intensively sprayed to the fruit three times on August 20, 25, and 28 in an orderwhereas harvested fruits were dipped for 10 sec. at the same concentration of chitosan as thepostharvest treatment. Fruits were stored at 17℃ for 9 days and 1℃ for 40 days, respectively. Soluble solid contents, titratable acidity, firmness, respiration rate, and weight loss wereexamined to configure the qualities of fruits during storage. The changes of fruit qualityparameters occurred more rapidly in calcium-chitosan treatment compared to untreated controlwhen fruit were stored at 17℃. Both pre- or post-harvest Ca-chitosan treatment, however,effectively decreases the weight and firmness of fruit stored at 1℃. Fruit respiration rate wasalso reduced, indicating the increase of shelf-life throughout ripening of the fruit.
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