eFood

Volume 2, Issue 3, June 2021, Pages 140 - 146

Inactivation of Staphylococcus aureus by the Combined Treatments of Ultrasound and Nisin in Nutrient Broth and Milk

Authors
Yongcheng Song1, Yushuang Lu1, 2, Xiufang Bi1, *, Liyi Chen3, Lei Liu1, Zhenming Che1
1Sichuan Key Laboratory of Food Bio-technology, College of Food and Bioengineering, Xihua University, 999 Jinzhou Road, Jinniu District, Chengdu 610039, China
2School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
3College of Food and Bioengineering, Yibin Xihua University Research Institute, Yibin 644000, China
*Corresponding author. Email: bxf1221@163.com
Corresponding Author
Xiufang Bi
Received 1 April 2021, Accepted 15 June 2021, Available Online 16 July 2021.
DOI
https://doi.org/10.2991/efood.k.210708.001How to use a DOI?
Keywords
Ultrasound, nisin, Staphylococcus aureus, inactivation, milk
Abstract

In this study, ultrasound (US) and nisin, applied individually or in combination (US + nisin), were investigated to determine their inactivation effect on Staphylococcus aureus in nutrient broth (NB) and milk. The inactivation of S. aureus by nisin at 0, 25 and 37°C followed “fast to slow” two-stage kinetics, and there was no significant difference in S. aureus reduction under these temperatures. A maximum reduction of 1.40 log10 cycles was obtained by nisin at 37°C for 15 min. The inactivation of S. aureus by US also followed “fast to slow” two-stage kinetics at 0°C, but it followed “fast–slow–fast” there-stage kinetics at 25 and 37°C. A maximum reduction of 5.87 log10 cycles was obtained by US at 968.16 W/cm2 and 37°C for 15 min. The reduction of S. aureus in milk was similar as in NB when treated at 968.16 W/cm2 and 25°C for 5–15 min. However, the reduction of S. aureus by US + nisin was similar to that obtained by either nisin or US alone, indicating that US and nisin had no added or synergistic inactivation effect on S. aureus in both NB and milk under the tested conditions.

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Copyright
© 2021 The Authors. Publishing services by Atlantis Press International B.V.
Open Access
This is an open access article distributed under the CC BY-NC 4.0 license (http://creativecommons.org/licenses/by-nc/4.0/).

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Journal
eFood
Volume-Issue
2 - 3
Pages
140 - 146
Publication Date
2021/07/16
ISSN (Online)
2666-3066
DOI
https://doi.org/10.2991/efood.k.210708.001How to use a DOI?
Copyright
© 2021 The Authors. Publishing services by Atlantis Press International B.V.
Open Access
This is an open access article distributed under the CC BY-NC 4.0 license (http://creativecommons.org/licenses/by-nc/4.0/).

Cite this article

TY  - JOUR
AU  - Yongcheng Song
AU  - Yushuang Lu
AU  - Xiufang Bi
AU  - Liyi Chen
AU  - Lei Liu
AU  - Zhenming Che
PY  - 2021
DA  - 2021/07/16
TI  - Inactivation of Staphylococcus aureus by the Combined Treatments of Ultrasound and Nisin in Nutrient Broth and Milk
JO  - eFood
SP  - 140
EP  - 146
VL  - 2
IS  - 3
SN  - 2666-3066
UR  - https://doi.org/10.2991/efood.k.210708.001
DO  - https://doi.org/10.2991/efood.k.210708.001
ID  - Song2021
ER  -