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16702

The presence of persistent coliform and E. coli contamination sequestered within the leaves of the popular fresh salad vegetable “Jarjeer / Rocket” (Eruca sativa L.).

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Last updated: 22 Jan 2023

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Abstract

Tests of Jarjeer/rocket (Eruca sativa L.) salad greens after multiple washings in water and mild disinfectant revealed a significant number of sequestered total coliforms and E. coli remained in the fresh greens.  Presumptive tests of 64 locally purchased fresh jarjeer greens resulted in finding 100% of the samples were contaminated by coliforms and E. coli.  Jarjeer greens had 2,509,273 CFU/g and 224,250 E. coli/g when washed once.  Washing the greens three times reduced the number of CFU by 95% and E. coli by 83%, but E. coli counts remained high 9,741 / g or 292,230 per 30 g normally eaten portion.  After macerating the thrice washed jarjeer the number of CFU increased to 2,129,774 / g and E. coli 56,292/g, which indicated the bacteria are sequestered in the leaves and could not be washed off.  Disinfection with diluted chlorine bleach reduced CFU by 68% and E. coli by 84%, but upon maceration CFUs increased from 42,059/g to 833,812/g and E. coli from 5/g to 2,150/g, which indicates washing with a disinfectant cannot rid the greens of coliforms.  Counts on parsley and lettuce were significantly lower than on jarjeer.  Results indicate there is sequestered fecal contamination of fresh jarjeer salad greens that remained on and inside epidermal cells even after multiple washings.  These data show that there is probably a persistent health threat when eating these fresh salad greens, but further testing for the presence of Salmonella and other pathogens is required.

DOI

10.21608/eajbsg.2010.16702

Keywords

Coliform, E. coli, jarjeer, Rocket, Eruca sativa, Parsley, lettuce, fecal, Contamination, United Arab Emirates, Dubai, sharjah, IDEXX, sequestered

Authors

First Name

Dennis

Last Name

Russell

MiddleName

J.

Affiliation

Department of Biology and Chemistry, American University of Sharjah, PO Box 26666, Sharjah, United Arab Emirates

Email

drussell@aus.edu

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Orcid

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First Name

Sarah

Last Name

Abdul Majid

MiddleName

-

Affiliation

Department of Biology and Chemistry, American University of Sharjah, PO Box 26666, Sharjah, United Arab Emirates

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City

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Orcid

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First Name

Daniel

Last Name

Tobias

MiddleName

-

Affiliation

Department of Biology and Chemistry, American University of Sharjah, PO Box 26666, Sharjah, United Arab Emirates.

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Volume

2

Article Issue

2

Related Issue

3543

Issue Date

2010-12-01

Receive Date

2018-10-15

Publish Date

2010-12-01

Page Start

1

Page End

8

Print ISSN

2090-0872

Online ISSN

2090-0880

Link

https://eajbsg.journals.ekb.eg/article_16702.html

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https://eajbsg.journals.ekb.eg/service?article_code=16702

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Original Article

Type Code

689

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Journal

Publication Title

Egyptian Academic Journal of Biological Sciences, G. Microbiology

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https://eajbsg.journals.ekb.eg/

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Article

Created At

22 Jan 2023