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Combination of supercritical CO2 and high-power ultrasound for the inactivation of fungal and bacterial spores in lipid emulsions

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Title: Combination of supercritical CO2 and high-power ultrasound for the inactivation of fungal and bacterial spores in lipid emulsions
Authors: Angela Gomez-Gomez, Edmundo Brito-de la Fuente, Críspulo Gallegos, Jose V. Garcia-Perez, Jose Benedito
Source: Ultrasonics Sonochemistry, Vol 76, Iss , Pp 105636- (2021)
Publisher Information: Elsevier, 2021.
Publication Year: 2021
Collection: LCC:Chemistry
LCC:Acoustics. Sound
Subject Terms: Spores, Inactivation, Supercritical fluids, Ultrasound, Emulsions, Chemistry, QD1-999, Acoustics. Sound, QC221-246
More Details: For the first time, this study addresses the intensification of supercritical carbon dioxide (SC-CO2) treatments using high-power ultrasound (HPU) for the inactivation of fungal (Aspergillus niger) and bacterial (Clostridium butyricum) spores in oil-in-water emulsions. The inactivation kinetics were analyzed at different pressures (100, 350 and 550 bar) and temperatures (50, 60, 70, 80, 85 °C), depending on the microorganism, and compared to the conventional thermal treatment. The inactivation kinetics were satisfactorily described using the Weibull model.Experimental results showed that SC-CO2 enhanced the inactivation level of both spores when compared to thermal treatments. Bacterial spores (C. butyricum) were found to be more resistant to SC-CO2 + HPU, than fungal (A. niger) ones, as also observed in the thermal and SC-CO2 treatments. The application of HPU intensified the SC-CO2 inactivation of C. butyricum spores, e.g. shortening the total inactivation time from 10 to 3 min at 85 °C. However, HPU did not affect the SC-CO2 inactivation of A. niger spores. The study into the effect of a combined SC-CO2 + HPU treatment has to be necessarily extended to other fungal and bacterial spores, and future studies should elucidate the impact of HPU application on the emulsion’s stability.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 1350-4177
Relation: http://www.sciencedirect.com/science/article/pii/S1350417721001784; https://doaj.org/toc/1350-4177
DOI: 10.1016/j.ultsonch.2021.105636
Access URL: https://doaj.org/article/b40caa12d0af49959570e09d76b5ee52
Accession Number: edsdoj.b40caa12d0af49959570e09d76b5ee52
Database: Directory of Open Access Journals
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  Data: Combination of supercritical CO2 and high-power ultrasound for the inactivation of fungal and bacterial spores in lipid emulsions
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  Data: <searchLink fieldCode="AR" term="%22Angela+Gomez-Gomez%22">Angela Gomez-Gomez</searchLink><br /><searchLink fieldCode="AR" term="%22Edmundo+Brito-de+la+Fuente%22">Edmundo Brito-de la Fuente</searchLink><br /><searchLink fieldCode="AR" term="%22Críspulo+Gallegos%22">Críspulo Gallegos</searchLink><br /><searchLink fieldCode="AR" term="%22Jose+V%2E+Garcia-Perez%22">Jose V. Garcia-Perez</searchLink><br /><searchLink fieldCode="AR" term="%22Jose+Benedito%22">Jose Benedito</searchLink>
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  Data: Ultrasonics Sonochemistry, Vol 76, Iss , Pp 105636- (2021)
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  Data: For the first time, this study addresses the intensification of supercritical carbon dioxide (SC-CO2) treatments using high-power ultrasound (HPU) for the inactivation of fungal (Aspergillus niger) and bacterial (Clostridium butyricum) spores in oil-in-water emulsions. The inactivation kinetics were analyzed at different pressures (100, 350 and 550 bar) and temperatures (50, 60, 70, 80, 85 °C), depending on the microorganism, and compared to the conventional thermal treatment. The inactivation kinetics were satisfactorily described using the Weibull model.Experimental results showed that SC-CO2 enhanced the inactivation level of both spores when compared to thermal treatments. Bacterial spores (C. butyricum) were found to be more resistant to SC-CO2 + HPU, than fungal (A. niger) ones, as also observed in the thermal and SC-CO2 treatments. The application of HPU intensified the SC-CO2 inactivation of C. butyricum spores, e.g. shortening the total inactivation time from 10 to 3 min at 85 °C. However, HPU did not affect the SC-CO2 inactivation of A. niger spores. The study into the effect of a combined SC-CO2 + HPU treatment has to be necessarily extended to other fungal and bacterial spores, and future studies should elucidate the impact of HPU application on the emulsion’s stability.
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