Type

Journal Article

Authors

Brijesh K Tiwari
Des Walsh
Carlos Alvarez
Joseph P Kerry
Kumari Shikha Ojha

Subjects

Microbiology

Topics
antimicrobial activity low power lactic acid salmonella typhimurium escherichia coli growth rate listeria monocytogenes staphylococcus aureus

Effect of high intensity ultrasound on the fermentation profile of Lactobacillus sakei in a meat model system. (2015)

Abstract The objective of this study was to investigate the efficacy of high intensity ultrasound on the fermentation profile of Lactobacillus sakei in a meat model system. Ultrasound power level (0-68.5W) and sonication time (0-9min) at 20°C were assessed against the growth of L. sakei using a Microplate reader over a period of 24h. The L. sakei growth data showed a good fit with the Gompertz model (R(2)>0.90; SE<0.042). Second order polynomial models demonstrated the effect of ultrasonic power and sonication time on the specific growth rate (SGR, μ, h(-1)) and lag phase (λ, h). A higher SGR and a shorter lag phase were observed at low power (2.99W for 5min) compared to control. Conversely, a decrease (p<0.05) in SGR with an increase in lag phase was observed with an increase in ultrasonic power level. Cell-free extracts obtained after 24h fermentation of ultrasound treated samples showed antimicrobial activity against Staphylococcus aureus, Listeria monocytogenes, Escherichia coli and Salmonella typhimurium at lower concentrations compared to control. No significant difference (p<0.05) among treatments was observed for lactic acid content after a 24h fermentation period. This study showed that both stimulation and retardation of L. sakei is possible, depending on the ultrasonic power and sonication time employed. Hence, fermentation process involving probiotics to develop functional food products can be tailored by selection of ultrasound processing parameters.
Collections Ireland -> Teagasc -> PubMed

Full list of authors on original publication

Brijesh K Tiwari, Des Walsh, Carlos Alvarez, Joseph P Kerry, Kumari Shikha Ojha

Experts in our system

1
Brijesh K. Tiwari
Teagasc
Total Publications: 49
 
2
D Walsh
Teagasc
Total Publications: 19
 
3
J P Kerry
University College Cork
Total Publications: 130
 
4
K. Shikha Ojha
University College Cork
Total Publications: 9