한약재 추출물, 가열 및 코팅 처리가 신선절단 사과의 갈변도에 미치는 영향
Effects of Medicinal Herb Extracts and Heat and Coating Treatments on the Browning Degree of Fresh-Cut Apples
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초록
신선절단 ‘후지’ 사과의 갈변도에 화학물질(ascorbic acid, cystein, sodium chloride, magnesium chloride, calcium chloride, histidine: 1% 용액), 한약재(갈근, 당귀, 산약, 오약, 천궁, 황기: 1% 추출액), 가열(절단과실과 원형과실, 40-60℃ 증류수) 및 코팅(albumin, dextrin, sucrose poly ester, whole soy flour: 0.5-4% 용액) 처리가 미치는 영향을 조사하였다. 각 처리방법별 신선절단 사과의 갈변도는 1% calcium chloride 용액 처리, 황기 추출물 처리, 3% dextrin과 1% whole soy flour 코팅 처리에 의해 가장 낮은 수준을 보였다. 가열처리의 갈변도는 절단과실 처리시에는 50℃에서, 원형과실 처리시에는 45℃에서 각각 처리한 시료에서 가장 낮은 수준을 보였다. 이로써 신선절단 사과의 갈변에 대한 한약재 추출물, 가열 및 코팅 처리의 억제 효과와 조건이 확인되었고, 이러한 방법은 화학물질을 부분적으로 대체할 수 있을 것으로 판단된다.
Abstract
This experiment was conducted to establish the optimum conditions for high CO2 gas treatment in combination with a proper gas-permeable packaging film to maintain the quality of fig fruit (Ficus carica L). Among the fig fruits with different high CO2 treatments, the quality change was most effectively controlled during storage in the 70%-CO2-treated fig fruit. Harvested fig fruit was packaged using microperforated oriented polypropylene (MP) film to maintain the optimum gas concentrations in the headspace of packaging for the modified-atmosphere system. MP film had an oxygen transmission rate of about 10,295 cm3/m2/day/atm at 25℃. The weight loss, firmness, soluble-solid content (SSC), acidity (pH), skin color (Hunter L, a, b), and decay ratio of the fig fruits were monitored during storage at 5 and 25℃. The results of this study showed that the OPP film, OPP film + 70% CO2, and MP film+70% CO2 were highly effective in reducing the loss rate, firmness and decay occurrence rate of fig fruits that were packaged with them during storage. In the case of using treatments with packages of OPP film and OPP film+70% CO2, however, adverse effects like package bursting or physiological injury of the fig may occur due to the gas pressure or long exposure to CO2. Therefore, the results indicated that MP film containing 70% CO2 can be used as an effective treatment to extend the freshness of fig fruits for storage at a proper low temperature.
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