Studying the Effects of Ultrasound Shock on Cell Wall Permeability and Survival of Some LAB in Milk
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چکیده
Microstructure changes and micro-damage behavior of some LAB under the impact of ultrasound shock (20 kHz for 5, 10, 15, 20, 25 and 30 minutes) was studied by optical microscope and Transmission Electron Microscope (TEM). Three kinds of micro damages are usually produced by ultrasound, micro-cracks, micro-voids and ruptures.Studies, by TEM showed that ultrasound can increase the cell wall permeability of the cells, which is important in the release of enzymes such as ß-galactosidas reduction of the coagulation time. The survival of LAB was very low in very long exposures of ultrasound.
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تاریخ انتشار 2008