摘要
研究了高压脉冲电场(pulsed electric field,PEF)对接种于胡萝卜汁中酿酒酵母(Saccharomyces cerevisiae,CGMCC2.604)的杀菌效果并进行了模型分析。结果表明,随电场强度和脉冲时间增加,PEF对酿酒酵母的杀灭效果增强,25kV/cm、2173μs时酿酒酵母降低了4.5个对数。Weibull模型和Log-Logistic模型均能很好的拟合PEF处理酿酒酵母的失活曲线,模型评价参数(Af,Bf,SS,RMSE和R2)分析表明,Log-Logistic模型比Weibull模型能更好地拟合PEF处理下酿酒酵母失活动力学变化。
The inactivation kinetics of Saccharomyces cerevisiae CGMCC 2,604 inoculated into carrot juice by pulsed electric field （PEF） and model analysis were investigated. The inactivation rate Of S. cerevisiae increased with the increment of the field strength and the treatment time. About 4.5 log reducti on of S.cerevisiae was achieved at 25 kV/cm of 2173μs. The survival curves were fitted by the Weibull and Log- logistic model, and the fitting performance of the two models was evaluated by using a series of indices including accuracy factor （Af）, bias factor （Bf）, the sum of the squares of the differences between the natural logarithm of the observed, predicted data （SS）, the correlation coefficient （R^2） and the root mean square error （RMSE） between the observed data and the predicted data. The comparison of these indices indicated that Log-logistic model could provide better fit to the inactivation by PEF than Weibull model.
出处
《食品工业科技》
CAS
CSCD
北大核心
2007年第5期66-70,共5页
Science and Technology of Food Industry
基金
国家自然科学基金资助项目(30371003)。
