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168769

IMPACT OF SPOILAGE MICROORGANISMS ON SOME DAIRY PRODUCTS

Article

Last updated: 23 Jan 2023

Subjects

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Tags

Microbiology, mycology and immunology
Milk hygiene & milk product

Abstract

Food spoilage is a complex process and excessive amounts of foods are lost due to microbial spoilage even with modern day preservation techniques. The aim of this study was to assess the microbiological quality of some dairy products in Beni-suef city, Egypt. A total of 210 samples of some dairy products (Kareish, Tallaga, Ras cheeses, small scale and large scale yoghurt, small scale and large scale cream samples) (30 of each) were collected from local retail stores, dairy shops and farmers' markets in Beni-Suef city. All samples were analysed for total bacterial count (TBC), total coliforms count, total yeast and mold count, total psychrotrophic count, lipolytic count and proteolytic count. The mean value of Kareish cheese and small scale cream for TBC were 1.07×107 ± 5.64 ×106 and 3.35×106 ± 1.23×106cfu/g, respectively. The mean values of Kareish, Tallaga, Ras cheeses, small scale yoghurt and small scale cream for total coliforms count were 2.55×105 ±1.59×105, 9.58×102 ± 4.32×102, 88.10 ± 21.11, 1.94×102 ± 79.47 and 1.58×104 ± 5.85×103cfu/g, respectively. The mean values for total yeast and mold count were 1.83×105 ± 9.25×104, 6.10×102 ± 3.35×102, 54.67 ± 22.04, 2.66×105 ± 8.07×104 and 2.57×104 ± 2.10×104cfu/g, respectively. The mean values for total psychrotrophic count were 2.89×107 ± 1.36×107, 1.16×106 ± 7.00×105, 2.46×106 ± 4.50×105, 7.81×105 ± 3.37×105 and 2.51×106 ± 6.95×105cfu/g, respectively. The mean values for lipolytic count were 1.23×106 ± 5.18×105, 9.32×105 ± 5.63×105, 2.91×106 ± 4.13×105, 2.32×105 ± 8.68×104 and 3.00×106 ± 7.34×105cfu/g, respectively. The mean value for proteolytic count were 1.16×106 ± 4.88×105, 9.94×105 ± 6.03×105, 5.85×106 ± 7.58×105, 3.32×105 ± 2.12×105 and 5.21×106 ± 1.27×106cfu/g, respectively. In conclusion, the presence of these organisms indicated that the examined dairy products were of inferior quality which reflects unhygienic measures, inadequate heat treatment during the manufacture, using bad quality ingredients or additives and improper sanitation during handling, storage and distribution.
 

DOI

10.21608/avmj.2019.168769

Keywords

Lipolytic Bacteria, Spoilage, coliforms, Ras cheese, yoghurt

Authors

First Name

GAMAL

Last Name

M. HASSAN

MiddleName

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Affiliation

Food Hygiene and Control Department, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef 62512, Egypt.

Email

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City

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Orcid

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First Name

ARAFA

Last Name

M.S. MESHREF

MiddleName

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Affiliation

Food Hygiene and Control Department, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef 62512, Egypt.

Email

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City

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Orcid

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First Name

MOHAMED

Last Name

M.A. ZEINHOM

MiddleName

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Affiliation

Food Hygiene and Control Department, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef 62512, Egypt.

Email

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City

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Orcid

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First Name

MOHAMED

Last Name

S. ABDEL- HALEM

MiddleName

-

Affiliation

Food Hygiene and Control Department, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef 62512, Egypt.

Email

msafwat1992@yahoo.com

City

-

Orcid

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Volume

65

Article Issue

161

Related Issue

24304

Issue Date

2019-04-01

Receive Date

2019-03-04

Publish Date

2019-03-31

Page Start

133

Page End

141

Print ISSN

1012-5973

Online ISSN

2314-5226

Link

https://avmj.journals.ekb.eg/article_168769.html

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https://avmj.journals.ekb.eg/service?article_code=168769

Order

15

Publication Type

Journal

Publication Title

Assiut Veterinary Medical Journal

Publication Link

https://avmj.journals.ekb.eg/

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Details

Type

Article

Created At

23 Jan 2023