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Evaluating the effect of heat transfer on cell disruption in ultrasound processes

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Abstract

Ultrasound is one of the mechanical methods used for disruption of microorganisms. Ultrasonic treatments of microorganisms are sensitive to a wide range of parameters such as net thermal power, residence time distribution (RTD), and the biological structure of the target microorganism. A commercial ultrasonic processor attached to a stainless steel processing cell was used in this research work. To evaluate the net heat dissipated in a small volume of the commercial yeast Saccharomyces cerevisiae, the suspension was subjected to 117 W at 20 kHz; the ultrasound cell was operated in a batch configuration with a Perspex base. Mixing of the yeast suspension and the RTD were evaluated using image processing techniques. The results of the present study showed that the heat lost through the stainless steel wall, Perspex base, and the Sonotrode (Titanium) was around 13.5 % of the total power. The yeast disruption results were found to be positive. The yeast disruption test showed that complete yeast reduction can be achieved at 117 W and a specific energy of 1,146 kJ kg−1. Further study is needed to understand the real causes of microorganism disruption using ultrasound.

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Acknowledgement

T.Y. would like to thank Professor David Buttsworth for his scientific advice at the early stage of this project.

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  1. National Centre for Engineering in Agriculture, Faculty of Health Engineering and Sciences, University of Southern Queensland, 4350, Toowoomba, Australia

    Talal Yusaf

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  1. Talal Yusaf
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Correspondence to Talal Yusaf.

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Yusaf, T. Evaluating the effect of heat transfer on cell disruption in ultrasound processes. Ann Microbiol 65, 1447–1456 (2015). https://doi.org/10.1007/s13213-014-0983-z

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  • DOI: https://doi.org/10.1007/s13213-014-0983-z

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