Journal
ULTRASONICS SONOCHEMISTRY
Volume 14, Issue 3, Pages 323-329Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2006.07.004
Keywords
ultrasound; Escherichia coli; inactivation; soluble solids; acidity; organic acids
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The objectives of this research were to study the effects of temperature, sugar concentration (8, 12, and 16 g/100 ml), organic acids (citric and malic acids) and pH (2.5 and 4.0) on ultrasound pasteurization. The model organism used for the research was Escherichia coli ATCC 25922, and ultrasound treatment times were conducted to achieve a 5 log (base 10) reduction. Ultrasound generates heat, therefore the study involved removing the heat using a jacketed beaker with refrigerant (-30 degrees C) to maintain processing temperature at or below 30 degrees C and eliminate the thermal inactivation effects. Overall, ultrasound increased the sensitivity of E. coli to thermal inactivation. The presence of soluble solids had a protective effect where the sonication time requirement increased. Similar to heat sensitivity, the lower pH environment resulted in E. coli having less resistance to sonication. The type of organic acid had the least significant effect on ultrasound inactivation of E. coli. (c) 2006 Elsevier B.V. All rights reserved.
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