Journal of Nuclear Agricultural Sciences ›› 2021, Vol. 35 ›› Issue (5): 1113-1120.

• Food Irradiation·Food Science •

### The γ-Irradiation Sterilization Effect on Listeria Innocua in Sugar and Salt Medium

XU Yuqian1,2, LI Shurong1,*, LI Wenhui1, WANG Li1, HUANG Guangxue1, WANG Huihua1, MA Changlu1

1. 1Beijing Vocational College of Agriculture, Beijing 102442;
2School of Food and Wine, Ningxia University, Yinchuan, Ningxia 750021
• Received:2020-11-03 Revised:2020-11-26 Online:2021-05-10 Published:2021-03-16

### 糖盐介质中γ-射线辐照对英诺克李斯特菌的杀菌效果研究

1. 1北京农业职业学院,北京 102442;
2宁夏大学食品与葡萄酒学院,宁夏 银川 750021
• 通讯作者: *李淑荣,女,教授,主要从事粮油、果蔬产品加工与质量安全控制技术研究。E-mail:shurongl@hotmail.com
• 作者简介:徐毓谦,女,主要从事农产品加工与贮藏研究。E-mail:xuyuqian1.15@163.com
• 基金资助:
国家科技支撑课题(2014BAA03B05),北京市职业院校教师素质提升计划食品营养与检测专业创新团队项目支持

Abstract: In order to know the effect of food matrix on the sterilization efficacy of γ-irradiation. By lgN-D linear regression analysis, the formula of the number of viable bacteria was obtained. The D10 value was used to characterize the difference of absorbed dose of gamma ray and electron beam irradiation in sterile water environment, and the influence of different gamma ray absorption dose, sugar concentration and salt solution concentration on the germicidal efficacy of Listeria Innocua was analyzed. The results shows that when the irradiation environment is the sterile water, the gamma ray D10 value is less than the electron beam, respectively 0.788 and 0.872 kGy, which shows that the gamma ray sterilization effect is better. Under the irradiation of gamma ray, The D10 value of Listeria Innocua in sterilized saline (0.85% NaCI) was not significantly different from that of sterile water. With the increase of salt concentration, the D10 value of innocua first increased and then decreased, and the D10 value at 3% and 5% salt concentration was 0.709 kGy and 0.730 kGy, respectively, lower than that of sterile water. The D10 value of Listeria Innocua in sugar solution was significantly higher than that of sterile water. With the increase of the concentration of sugar solution, D10 first increased and then decreased. The D10 value of 5% sugar solution was the largest, which was 1.13 kGy. It could be seen that salt solution has a synergistic effect on sterilization, while sugar solution has a resistance effect on sterilization. The results provide a reference for further exploring the mechanism of irradiation sterilization, reducing radiation dose cost and improving product quality.