Research Note: Saccharomyces cerevisiae Thermal Inactivation Kinetics Combined with Ultrasound

摘要

Inactivation kinetics of Saccharomyces cerevisiae during thermal treatments at moderate temperatures (45.0, 47.5, 50.0, 52.5, or 55.0 deg. C) combined with application of 20 kHz of ultrasound were evaluated. S. cerevisiae inactivation under the combined effects of heat and ultrasound followed first-order reaction kinetics, with decimal reduction time (D) that varied from 22.3 to 0.8 min. D values in treatments that combined heat and ultrasound were significantly smaller (P<0.05) than D values obtained for thermal treatments and were more noticeable at temperatures below 50 deg. C. The dependence of the D Value on temperature and a significantly (P<0.05) greater z value for combined treatments. Yast heat inactivation kinetics Revealed decreased thermal resistance caused by ultrasound.