감마선 조사를 이용한 시판 분말원료의 위생화
Sanitization of Commercial Powdered Products Using Gamma Irradiation
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Microbiological populations and the sterility of commercial powdered products treatedwith gamma irradiation at 0~10 kGy were investigated before using them as ingredients for anon-cooked Saengsik product. We evaluated a total of 14 powdered products: 8 powdered cereals,3 powdered tubers, and 3 powdered leafy vegetables. The total numbers of bacterial populationsin non-irradiated powdered cereals, tubers, and leafy vegetables were 2.7~6.9, 5.6~6.0, and 5.3~6.8 log CFU∙g-1, respectively. Moreover, coliform bacteria were not indicated in adlay, millet,germinated brown rice, soybean, and mulberry leaves powder within detection limit (2.0 log CFU∙g-1). The number of Bacillus cereus exceeded 3.0 log CFU∙g-1 (the maximum limit for Saengsikproducts) in all samples, excluding perilla seeds, buckwheat, barley, oat, potato, and Jerusalemartichoke powder. However, a dose of 6 kGy of gamma irradiation reduced the microbiologicalpopulations in all samples, and all the powdered products met the microbial requirements forSaengsik products. Futhermore, it was confirmed that all microorganisms in the 9 powdered products,except fermented brown rice, sweet potatoes, and 3 leafy vegetables, were sterilized by 10kGy of gamma irradiation.
Abstract
Microbiological populations and the sterility of commercial powdered products treatedwith gamma irradiation at 0~10 kGy were investigated before using them as ingredients for anon-cooked Saengsik product. We evaluated a total of 14 powdered products: 8 powdered cereals,3 powdered tubers, and 3 powdered leafy vegetables. The total numbers of bacterial populationsin non-irradiated powdered cereals, tubers, and leafy vegetables were 2.7~6.9, 5.6~6.0, and 5.3~6.8 log CFU∙g-1, respectively. Moreover, coliform bacteria were not indicated in adlay, millet,germinated brown rice, soybean, and mulberry leaves powder within detection limit (2.0 log CFU∙g-1). The number of Bacillus cereus exceeded 3.0 log CFU∙g-1 (the maximum limit for Saengsikproducts) in all samples, excluding perilla seeds, buckwheat, barley, oat, potato, and Jerusalemartichoke powder. However, a dose of 6 kGy of gamma irradiation reduced the microbiologicalpopulations in all samples, and all the powdered products met the microbial requirements forSaengsik products. Futhermore, it was confirmed that all microorganisms in the 9 powdered products,except fermented brown rice, sweet potatoes, and 3 leafy vegetables, were sterilized by 10kGy of gamma irradiation.
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