کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1884729 1043362 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of gamma irradiation on the radiation-resistant bacteria and polyphenol oxidase activity in fresh kale juice
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
پیش نمایش صفحه اول مقاله
Effects of gamma irradiation on the radiation-resistant bacteria and polyphenol oxidase activity in fresh kale juice
چکیده انگلیسی

Gamma radiation was performed to prolong the shelf life of natural kale juice. The total aerobic bacteria in fresh kale juice, prepared by a general kitchen process, was detected in the range of 106 cfu/ml, and about 102 cfu/ml of the bacteria survived in the juice in spite of gamma irradiation treatment with a dose of 5 kGy. Two typical radiation-resistant bacteria, Bacillus megaterium and Exiguobacterium acetylicum were isolated and identified from the 5 kGy-irradiated kale juices. The D10 values of the vegetative cell and endospore of the B. megaterium in peptone water were 0.63±0.05 and 1.52±0.05 kGy, respectively. The D10 value of the E. acetylicum was calculated as 0.65±0.06 kGy. In the inoculation test, the growth of the surviving B. megaterium and E. acetylicum in the 3–5 kGy-irradiated kale juice retarded and/or decreased significantly during a 3 d post-irradiation storage period. However, there were no significant differences in the residual polyphenol oxidase activity and browning index between the nonirradiated control and the gamma irradiated kale juice during a post-irradiation period.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Physics and Chemistry - Volume 76, Issue 7, July 2007, Pages 1213–1217
نویسندگان
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