학술논문
Screening of Radio-resistant Lactic Acid Bacteria
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- 영문명
- 발행기관
- 한국축산식품학회
- 저자명
- E Nam Hwang Sang Mo Kang Jae Kyung Kim Ju Woon Lee Jong Heum Park
- 간행물 정보
- 『Food Science of Animal Resources』Korean Journal for Food Science of Animal Resources 제33권 제3호, 335~340쪽, 전체 6쪽
- 주제분류
- 농수해양 > 식품과학
- 파일형태
- 발행일자
- 2013.06.30
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국문 초록
영문 초록
This study screened for radio-resistant strains lactic acid bacteria (LAB) by evaluating their capability to survive exposure to ionizing radiation. Ten strains of LAB - Lactobacillus bulgaricus, Lactobacillus paracasei, Lactobacillus casei, Lactobacillus acidophilus, Lactobacillus plantarum, Lactobacillus delbruekii, Lactococcus lactis, Streptococcus thermophilus, Bifidobacterium breve, and Pediocuccos pentosaceus - were selected and subcultuted twice. The LAB was then further cultured for 3 d at 37oC to reach 7-10 Log colony-forming units (CFU)/mL prior to irradiation and immediately exposed to gamma rays or electron beams with absorbed doses of 0, 1, 2, 3, 4, 5, 6, 8, and 10 kGy. Gamma irradiation gradually decreased the number of the tested viable LAB, and the effect was irradiation dose dependent. A similar effect was found in electron beam-irradiated LAB. Radiation sensitivity of LAB was calculated as D10 values, which ranged from 0.26 kGy to 0.9 kGy and 0.5 kGy to 1.44 kGy with exposure to gamma and electron beam irradiation, respectively, in all tested LAB. L. acidophilus was the most resistant to gamma and electron beam irradiation, with D10 values of 0.9 kGy and 1.44 kGy, respectively. These results suggest that L. acidophilus might be suitable for the preparation of probiotics as direct-fed microbes for astronauts in extreme space environments.
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