Sonodynamic action of curcumin on foodborne bacteria Bacillus cereus and Escherichia coli
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AbstractBacterial contamination is an important cause of foodborne diseases. The present study aimed to investigate sonodynamic action of curcumin on foodborne bacteria Bacillus cereus (B. cereus) and Escherichia coli (E. coli). The uptake of curcumin was measured for optimizing the concentration incubation time before ultrasound sonication, and colony forming units (CFU) were counted after ultrasound treatment. The chromosomal DNA fragmentation of bacteria was analyzed and the effect of hypoxic condition on the antibacterial efficacy of sonodynamic action of curcumin was also assessed in this study. The results showed that the maximum uptake of curcumin in B. cereus and E. coli occurred in 50 min after curcumin incubation. Curcumin had sonodynamic bactericidal activity in a curcumin dose-dependent manner, and 5.6-log reduction in CFU of B. cereus was observed after curcumin treatment (2.0 mu M), however, only 2-log reduction in CFU of E. coli after 40 mu M curcumin treatment. No significant change in chromosomal DNA was found after the combined treatment of curcumin and ultrasound. The survival of B. cereus and E. coli after sonodynamic treatment in hypoxic group was significantly higher than that in normal oxygen group. These findings indicated that sonodynamic action of curcumin had significant inactivation effect on foodborne bacteria, and B. cereus was more sensitive to sonodynamic treatment of curcumin than E. coli. Sonodynamic antibacterial activity of curcumin might be dependent on the oxygen environment. (C) 2015 Elsevier B.V. All rights reserved.
All Author(s) ListWang XN, Ip M, Leung AW, Yang ZR, Wang P, Zhang BT, Ip SP, Xu CS
Name of Conference2015 International Congress on Ultrasonics (ICU)
Start Date of Conference11/05/2015
End Date of Conference14/05/2015
Place of ConferenceMetz
Journal nameUltrasonics,Ultrasonics
Year2015
Month9
Day1
Volume Number62
PublisherELSEVIER SCIENCE BV
Pages75 - 79
ISSN0041-624X
eISSN1874-9968
LanguagesEnglish-United Kingdom
KeywordsCurcumin; Foodborne bacteria; Sonodynamic antibacterial chemotherapy; Sonodynamic inactivation
Web of Science Subject CategoriesAcoustics; Radiology, Nuclear Medicine & Medical Imaging

Last updated on 2021-16-04 at 00:17