감마선 조사에 따른 분말 타락죽의 품질 평가
Quality Evaluation of Gamma-Irradiated Tarakjuk Powder, Korean Milk Porridge
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초록
This study was conducted to investigate bacterial growth, viscosity, color, and sensoryproperties of gamma-irradiated Tarakjuk powder, a Korean milk porridge powder, at 1, 3, 5, 7, and10 kGy. The total aerobic bacteria in non-irradiated Tarakjuk powder was 2.56 log CFU∙g-1,whereas it was not observed within the detection limit of 2 log CFU∙g-1 in samples irradiated atmore than 1 kGy. Spore-forming bacteria, however, were not observed in all samples within thedetection limit of 1 log CFU∙g-1. The viscosity of rehydrated Tarakjuk after gamma irradiationsignificantly decreased from 16,770 cP to 4,060 cP when irradiated at 10 kGy. The redness (a* value)and yellowness (b* value) evaluated using a colorimeter were significantly increased according tothe increase in irradiation dose (p⁄0.05), while there was no difference in color evaluation conductedby panels. The overall acceptance decreased as the irradiation dose increased, and the 5kGy sample was 4.0 (normal) on a 7-point scale. As a result, it is considered that a gamma irradiationof 5 kGy is enough to sterilize Tarakjuk powder with a acceptable sensory quality.
Abstract
This study was conducted to investigate bacterial growth, viscosity, color, and sensoryproperties of gamma-irradiated Tarakjuk powder, a Korean milk porridge powder, at 1, 3, 5, 7, and10 kGy. The total aerobic bacteria in non-irradiated Tarakjuk powder was 2.56 log CFU∙g-1,whereas it was not observed within the detection limit of 2 log CFU∙g-1 in samples irradiated atmore than 1 kGy. Spore-forming bacteria, however, were not observed in all samples within thedetection limit of 1 log CFU∙g-1. The viscosity of rehydrated Tarakjuk after gamma irradiationsignificantly decreased from 16,770 cP to 4,060 cP when irradiated at 10 kGy. The redness (a* value)and yellowness (b* value) evaluated using a colorimeter were significantly increased according tothe increase in irradiation dose (p⁄0.05), while there was no difference in color evaluation conductedby panels. The overall acceptance decreased as the irradiation dose increased, and the 5kGy sample was 4.0 (normal) on a 7-point scale. As a result, it is considered that a gamma irradiationof 5 kGy is enough to sterilize Tarakjuk powder with a acceptable sensory quality.
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