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81976

DETECTION OF Escherichia coli IN DAIRY AND MILK-RELATED PRODUCTS USING DIRECT PLATING AND THE 3-STAGE METHOD

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Last updated: 04 Jan 2025

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Abstract

Escherichia coli is a frequent foodborne contaminant that negatively affects the quality and safety of dairy products. The present study aimed to examine the presence of E. coli in dairy and milk-related products using two detection methods namely, "direct plating" and "3-stage method". Sixty-nine samples of yoghurt, Domiati cheese, Kariesh cheese, UHT milk, dried skim milk, dried ice-cream, dried whey proteins, creamchantee, infant milk formulas, and "sahlab" were collected from 3 Egyptian governorates and examined for the presence of E. coli.  A total of 250 suspected E. coli isolates could be cultured from these samples and subjected to biochemical identification that characterized 35 of these isolates as potential E. coli cultures. Further biochemical testing of these 35 cultures using the Microbact MGNB-12A miniaturized identification system confirmed their belonging to the E. coli species. These isolates were variably recovered from yoghurt (8 isolates), Kariesh cheese (12 isolates), UHT milk (1 isolate), dried ice-cream (2 isolates), creamchantee (1 isolate), infant milk formulas (5 isolates), and sahlab (6 isolates). The 3-stage method showed higher efficiency in detecting E. coli in these products than direct plating. This was attributed to the ability of the 3-stage method to detect injured cells generated on exposure to sub-lethal stress factors including those applied during food manufacture and preservation. The 3-stage method outlined in this study is, therefore, recommended for reliable detection of E. coli in dairy and milk-related products.

DOI

10.21608/jfds.2011.81976

Keywords

Escherichia coli, detection, injured cells, Dairy products

Authors

First Name

Mona

Last Name

Yassin

MiddleName

A.

Affiliation

Food Safety and Microbial Physiology Laboratory, Dairy Dept., Fac. Agric., Mans. Univ.

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City

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Orcid

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First Name

M.

Last Name

Zin El-Din

MiddleName

M.

Affiliation

Faculty of Tourism and Hotels, Mansoura University

Email

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City

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Orcid

-

First Name

W.

Last Name

El-Sharoud

MiddleName

M.

Affiliation

Food Safety and Microbial Physiology Laboratory, Dairy Dept., Fac. Agric., Mans. Univ.

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City

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Orcid

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Volume

2

Article Issue

8

Related Issue

12347

Issue Date

2011-08-01

Receive Date

2020-04-12

Publish Date

2011-08-01

Page Start

505

Page End

512

Print ISSN

2090-3650

Online ISSN

2090-3731

Link

https://jfds.journals.ekb.eg/article_81976.html

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https://jfds.journals.ekb.eg/service?article_code=81976

Order

10

Type

Original Article

Type Code

886

Publication Type

Journal

Publication Title

Journal of Food and Dairy Sciences

Publication Link

https://jfds.journals.ekb.eg/

MainTitle

DETECTION OF Escherichia coli IN DAIRY AND MILK-RELATED PRODUCTS USING DIRECT PLATING AND THE 3-STAGE METHOD

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Article

Created At

22 Jan 2023