Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Development of Dipping Solution to Extend a Shelf-life of Fresh-cut Apples

Fresh-cut 사과의 품질 보존성 향상을 위한 침지액의 개발

  • Published : 2006.02.01
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Abstract

Possible application of hurdle technology extention of shelf-life of fresh-cut apples was investigated by evaluating various hurdle factors known to be effective microbial growth inhibitors and their synergistic effects. Fresh-cut apples treated with chitooligosaccharide or grapefruit seed extract (GSE) showed higher microbial counts than those treated with distilled water during latter half of storage period, and at high concentrations. Citric and malic acids showed similar results, although microbial counts of fresh-cut apples treated with 0.75% or higher concentration of citric acid increased at 4 days of storage at $18^{\circ}C$, indicating malic acid is more effective than all hurdles tested for controlling microbial growth. Using ascorbic acid and calcium chloride as additional hurdles to control browning and softening, minimum and maximum compositions of dipping solution were: 0.25 : 0.5 : 0.25% and 0.75 : 1.0 : 0.75% malic acid: ascorbic acid: calcium chloride, respectively.

Fresh-cut 사과의 미생물학적 품질 보존성 향상을 위해 미생물 생육억제 효과가 크다고 알려진 다양한 hurdle 인자를 개별 평가하고 이들의 병용처리 효과를 검토하여 적용 가능성을 확인하고자 하였다. Chitooligosaccharide와 GSE(grapefruit seed extrat)를 처리한 fresh-cut 사과는 저장 후반으로 혹은 농도가 높을수록 무처리구에 비해 총균수가 증가하는 현상이 나타나 미생물 증식억제를 위한 hurdle로써의 적용이 어렵다고 판단되었다. Citric acid의 경우 malic acid와 유사한 결과를 보였으나 0.75% 이상의 citric acid 처리구에서는 malic acid 처리구와 달리 $18^{\circ}C$ 저장 4일을 전후해 총균수가 증가하는 현상을 보였다. 이에 미생물 증식억제의 주요 hurdle로 malic acid를 선정하였고, 부가적인 hurdle로는 미생물 생육억제 효과를 나타내면서 갈변 및 조직연화를 지연시켜 주는 ascorbic acid와 calcium chloride로 선정하였다. 이들의 최적 dipping solution의 구성 및 함량은 미생물 저해 및 갈변 방지측면을 모두 고려하여 최소 0.25% malic acid: 0.5% ascorbic acid: 0.25% calcium chloride, 최대 0.75% malic acid: 1.0% ascorbic acid: 0.75% calcium chloride로 결정하였다.

Keywords

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