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The possibilities of using Ultrasonically Activated Streams to reduce the risk of foodborne infection from salad

The possibilities of using Ultrasonically Activated Streams to reduce the risk of foodborne infection from salad
The possibilities of using Ultrasonically Activated Streams to reduce the risk of foodborne infection from salad

In this study, we investigated the effects of an ultrasonically activated stream (UAS) on the removal of microbial contaminants from spinach leaves. The microbial loads on samples cleaned with and without UAS were enumerated using the cell culture method and compared against unwashed samples on day 0 and day 6 after cleaning. The effects of UAS cleaning on leaf quality were also examined through both macroscopic and microscopic inspection, as well as measurement of the electrolyte leakage rate. Results showed that the microbial load on samples cleaned with UAS for 2 min was significantly lower on day 6 after cleaning than on those treated without ultrasound. Comparison between the cleaning effects of UAS for 40 s versus 2 min indicated that a cleaning duration of 2 min allowed sufficient time for UAS to disaggregate and detach the microbial contamination more effectively. In this case, the induction of bacteria into a viable but non-culturable state does not affect the shelf-life test results as much as it does with a 40 s clean. UAS cleaning for 2 min did not produce significant surface damage, which can affect overall leaf quality. These findings highlight the potential of UAS systems in the salad industry to improve the microbiological quality and shelf life of salads.

Bubbles, Food safety, Foodborne diseases, Ready-to-eat salads, Ultrasonic cleaning, Ultrasound
0301-5629
1616-1630
Chong, Weng Yee
29b2d9b4-e2b3-43aa-bffa-5d0b8fb2ee1c
Secker, Thomas
16b0a878-984f-4272-bfaa-667c7c63023a
Dolder, Craig
b08350be-fd09-4049-95bd-06a9c157a8bc
Keevil, Charles
cb7de0a7-ce33-4cfa-af52-07f99e5650eb
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Chong, Weng Yee
29b2d9b4-e2b3-43aa-bffa-5d0b8fb2ee1c
Secker, Thomas
16b0a878-984f-4272-bfaa-667c7c63023a
Dolder, Craig
b08350be-fd09-4049-95bd-06a9c157a8bc
Keevil, Charles
cb7de0a7-ce33-4cfa-af52-07f99e5650eb
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae

Chong, Weng Yee, Secker, Thomas, Dolder, Craig, Keevil, Charles and Leighton, Timothy (2021) The possibilities of using Ultrasonically Activated Streams to reduce the risk of foodborne infection from salad. Ultrasound in Medicine & Biology, 46 (6), 1616-1630. (doi:10.1016/j.ultrasmedbio.2021.01.026).

Record type: Article

Abstract

In this study, we investigated the effects of an ultrasonically activated stream (UAS) on the removal of microbial contaminants from spinach leaves. The microbial loads on samples cleaned with and without UAS were enumerated using the cell culture method and compared against unwashed samples on day 0 and day 6 after cleaning. The effects of UAS cleaning on leaf quality were also examined through both macroscopic and microscopic inspection, as well as measurement of the electrolyte leakage rate. Results showed that the microbial load on samples cleaned with UAS for 2 min was significantly lower on day 6 after cleaning than on those treated without ultrasound. Comparison between the cleaning effects of UAS for 40 s versus 2 min indicated that a cleaning duration of 2 min allowed sufficient time for UAS to disaggregate and detach the microbial contamination more effectively. In this case, the induction of bacteria into a viable but non-culturable state does not affect the shelf-life test results as much as it does with a 40 s clean. UAS cleaning for 2 min did not produce significant surface damage, which can affect overall leaf quality. These findings highlight the potential of UAS systems in the salad industry to improve the microbiological quality and shelf life of salads.

Text
Chong et al 2021 - Accepted manuscript - The possibilities of using Ultrasonically Activated Streams to reduce the risk of foodborne infection from salad - Accepted Manuscript
Restricted to Repository staff only until 27 January 2022.
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More information

Accepted/In Press date: 24 January 2021
Published date: 9 April 2021
Keywords: Bubbles, Food safety, Foodborne diseases, Ready-to-eat salads, Ultrasonic cleaning, Ultrasound

Identifiers

Local EPrints ID: 446678
URI: http://eprints.soton.ac.uk/id/eprint/446678
ISSN: 0301-5629
PURE UUID: 4812fbdc-dffd-4fe6-b525-0e25f693f8be
ORCID for Thomas Secker: ORCID iD orcid.org/0000-0001-7168-8592
ORCID for Craig Dolder: ORCID iD orcid.org/0000-0002-0817-326X
ORCID for Charles Keevil: ORCID iD orcid.org/0000-0003-1917-7706
ORCID for Timothy Leighton: ORCID iD orcid.org/0000-0002-1649-8750

Catalogue record

Date deposited: 17 Feb 2021 17:34
Last modified: 26 Nov 2021 03:04

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