감마선 조사에 따른 동결건조과일의 품질 특성 평가
Evaluation of Quality Properties of Gamma-irradiated Freeze-dried Fruits
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The quality properties of freeze-dried apples, pears, strawberries and pineapplesgamma-irradiated at 0, 1, 2, 3, 4, and 5 kGy were evaluated to develop germ-free products forimmuno-compromised patients. The initial count of total aerobic bacteria in non-irradiated apples,pears, strawberries and pineapple was 2.5, 3.1, 2.6, and 3.2 log CFU∙g-1, respectively. Microorganismswere not observed in apples after 1 kGy, in pears and strawberries after 4 kGy, and inpineapples at 5 kGy within a detection limit of 10 CFU∙g-1. In addition, the sterilization of eachsample was confirmed at the same dose. The score for the overall acceptance of freeze-dried fruitirradiated at a sterilization dose was 5.5 for apples, 4.1 for pineapples, and 4.0 for the other fruits,whereas that of non-irradiated control sample was 5.6 for apples, 5.2 for pears, and 5.8 for strawberriesand pineapples with a 7-point scale. As a result, gamma irradiation of 1 kGy for apples, 4kGy for strawberries and pears, and 5 kGy for pineapples is sufficient to sterilize each freeze-driedfruit with acceptable sensory properties.
Abstract
The quality properties of freeze-dried apples, pears, strawberries and pineapplesgamma-irradiated at 0, 1, 2, 3, 4, and 5 kGy were evaluated to develop germ-free products forimmuno-compromised patients. The initial count of total aerobic bacteria in non-irradiated apples,pears, strawberries and pineapple was 2.5, 3.1, 2.6, and 3.2 log CFU∙g-1, respectively. Microorganismswere not observed in apples after 1 kGy, in pears and strawberries after 4 kGy, and inpineapples at 5 kGy within a detection limit of 10 CFU∙g-1. In addition, the sterilization of eachsample was confirmed at the same dose. The score for the overall acceptance of freeze-dried fruitirradiated at a sterilization dose was 5.5 for apples, 4.1 for pineapples, and 4.0 for the other fruits,whereas that of non-irradiated control sample was 5.6 for apples, 5.2 for pears, and 5.8 for strawberriesand pineapples with a 7-point scale. As a result, gamma irradiation of 1 kGy for apples, 4kGy for strawberries and pears, and 5 kGy for pineapples is sufficient to sterilize each freeze-driedfruit with acceptable sensory properties.
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