摘要
以大肠杆菌为研究对象,利用自行研制的脉冲磁场杀菌设备,研究了大肠杆菌不同的生长时期、磁场强度、脉冲数和物料温度对杀菌效果的影响。结果表明:大肠杆菌在对数生长前期对脉冲磁场更敏感;随磁场强度的增加,杀菌效果呈现波动性变化,在场强为3.47T时杀菌效果最好;随脉冲数的增加,细菌残留率会出现一谷值,之后随脉冲数的进一步增加,杀菌效果反而变差,在脉冲数为20个时,杀菌效果最好;物料温度越高,细菌残留率越低,杀菌效果越好,但该温度远低于热致死温度。脉冲磁场对大肠杆菌杀菌的主次因素为磁场强度(脉冲数(物料温度;最佳参数组合为磁场强度3.47T,脉冲数20,物料温度30℃。
Using Escherichia coil as the object microorganism, the influence of different growth phase of Escherichia coil, magnetic field intensity, pulsed number of magnetic field and material temperature on sterilization effect was studied. The results indicated that Escherichia coil was sensitive to pulsed magnetic filed at log phase. As the magnetic field intensity increase, sterilization effect appeared fluctuant change and the sterilization effect was optimal when magnetic field intensity was 3.47T. As the pulsed number increase, the survival rate of bacillus will appear a minimum value. Further increase of pulsed number, sterilization effect became bad. Material temperature was higher, the survival rate of bacillus was lower and sterilization effect was better. But comparing with thermal death point, this temperature was very low. The main factors on the sterilizing Escherichia coil by pulsed magnetic field were magnetic field intensity 〉 pulsed number 〉 material temperature. The optimum parameters were that intensity of magnetic field was 3.47T, pulsed number was 20 and material temperature was 30℃.
出处
《食品工业科技》
CAS
CSCD
北大核心
2008年第7期79-81,共3页
Science and Technology of Food Industry
基金
“863”计划重点项目子项(2007AA100400)
关键词
脉冲磁场
大肠杆菌
杀菌效果
pulsed magnetic field
Escherichia coli
sterilization effect
