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The combined action of the nisin and lactoperoxidase system activation on the microbiological quality of raw milk with special emphasis against E. coli O157H7 in milk
Other Title(s)
الفعل التازري للنيسين و نظام اللاكتوبيروكسيديز المفعل على النوعية الجرثومية للحليب الخام مع التأكيد ضد الاليشريشيا القولونية E.coil 0157 : H 7 في الحليب
Joint Authors
Hammad, Safwah Mustafa
Khudayr, Zaynah Saib
Source
Iraqi Journal of Veterinary Medicine
Issue
Vol. 40, Issue 2 (31 Dec. 2016), pp.61-65, 5 p.
Publisher
University of Baghdad College of Veterinary Medicine
Publication Date
2016-12-31
Country of Publication
Iraq
No. of Pages
5
Main Subjects
Topics
Abstract EN
Escherichia coli O157 : H7 were isolated from 90 bovine and ovine locally produced soft cheese samples and their identification were confirmed based on the cultural, biochemical reactions and serological properties, E.coli O157:H7 isolates obtained by plating on the Chromogenic agars.
They were further tested serologically for the presence of both O157 and H7 antigenes using the agglutination test kit.
The highest non-significant prevalence (P>0.05) level of E.coli O157 : H7 was found in the ewe’s soft cheese samples (37.77%) followed by the cow’s soft cheese samples (31.11%).
The antimicrobial potency of the Nisin against the sensitive Lactobacillus strain was lost after (10) minutes of heating at (80°C) while retaining (100%) of its antimicrobial potency after its exposure to the pasteurization time and temperature (63°C/ 30 min.).
The highest antimicrobial potency of Nisin was achieved at neutral pH (100%) while 90% and 45% of its potency were retained under acidic (pH=3) and alkaline (pH=9) conditions respectively.
Nisin had short bacteriocidal incubation period against the sensitive lactobacillus strain where its antimicrobial potency reduced after 48 hours and lost after 120 hours of refrigeration storage period.
E.coli O157 : H7 was insensitive to the action of Nisin while stressed E.coli O157 : H7 by activation of lactoperoxidase system in pasteurized milk was susceptible to its action and such result gave an indication of the synergistic effect of Nisin with activated lactoperoxidase system.
American Psychological Association (APA)
Khudayr, Zaynah Saib& Hammad, Safwah Mustafa. 2016. The combined action of the nisin and lactoperoxidase system activation on the microbiological quality of raw milk with special emphasis against E. coli O157H7 in milk. Iraqi Journal of Veterinary Medicine،Vol. 40, no. 2, pp.61-65.
https://search.emarefa.net/detail/BIM-745779
Modern Language Association (MLA)
Khudayr, Zaynah Saib& Hammad, Safwah Mustafa. The combined action of the nisin and lactoperoxidase system activation on the microbiological quality of raw milk with special emphasis against E. coli O157H7 in milk. Iraqi Journal of Veterinary Medicine Vol. 40, no. 2 (2016), pp.61-65.
https://search.emarefa.net/detail/BIM-745779
American Medical Association (AMA)
Khudayr, Zaynah Saib& Hammad, Safwah Mustafa. The combined action of the nisin and lactoperoxidase system activation on the microbiological quality of raw milk with special emphasis against E. coli O157H7 in milk. Iraqi Journal of Veterinary Medicine. 2016. Vol. 40, no. 2, pp.61-65.
https://search.emarefa.net/detail/BIM-745779
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 64-65
Record ID
BIM-745779