高压处理对鲜牛乳中枯草杆菌芽孢致死效应的研究

Study on Germination and Inactivation of B.subtilis Spores in Fresh Milk by Oscillatory and Pulsed Ultra High Pressure

采用压力、时间、循环处理次数相结合的方法,在较低的温度下,对鲜乳中枯草杆菌芽孢激活及致死效应进行了研究。在40℃条件下,200MPa低压处理5min,停压1min,再升至700MPa下处理5min,循环处理7次,可将鲜乳中枯草杆菌芽孢数减少到102～103cells/ml。

A method of germinating and sterilizing B.Subtilis spores with mjnimal heating was studied by the combined effect of oscillatory and pulsed UHP, pressurization times, and with certain operations cycles. The condition above room temperature was benefit to UHP stefilization. At 40℃, seven pressurization cycles with the first pressure at 200MPa for 5rain, followed by an ambient pressure pause for 1rain, then another 700MPa pressurization for 5rain, decreases the spores count from 107 to 102-103cells/ml.