عنوان المقالة: The effect of some medical plants extracts on the pollutive microorganisms isolated from cheese in Diwaniyh city. A Thesis for the Degree of Master of Science in Microbial Environment.
The present study was carried out to identify microorganisms responsible for the pollution of cheese and find out if there are any possible means for eliminating these microorganisms .
The study included three kinds of cheese samples :
Processed cheese samples taken from Al-Qadisiya dairy factory directly .
Processed cheese samples taken from the dairy factory's dealers.
Soft cheese samples taken from local sellers in Al-Diunaiya city markets .
Samples were collected monthly from November (2000) untill June (2001) . the number of samples collected was (160) , each taken in (10) specimens
All kinds of bacteria , Molds and Yeasts in these samples were detected and were found out to be of much harm to man's health causing in some cases food poisoning .
The local soft cheese samples registered the highest degree of pollution with microorganisms compared with processed cheese samples taken from Al-Qadisiya dairy factory's dealers, while those taken from the factory directly registered the least degree of pollution , such variations were attributed to different pollutive agents to which the produced cheese in exposed during marketing , storing or selling by dealers .
Moreover , ecological conditions also proved influential on the number of microorganisms beings in the cheese samples studied regardless of their sources , there number in the Summer months was much greater than in the Winter months .
The following microorganisms were isolated from the cheese samples studies :
Coliform bacteria ; Fecal Coliform bacteria ; streptococci ; Fecal streptococci ; Salmonella ;Staphylococcus aureus ; Psycrotrophic bacteria ; Thrmo philic bacteria ; Proteolytic bacteria ; Lipolytic bacteria ; Spore forming bacteria ; Molds and Yeasts .
On the other hand, certain tests were Performed on some medical plants extracts to detect if they have any effect on group of the isolated microorganisms included : Staphylococcus aureus ; E.coli ; streptococcus faecalis ; salmonella typhimumium ; Bacillus cereus ; proteus vulgaris ; Pseudomonas flourescens ; Klebsiella pneumoniae ; Aspergillus niger ; Penicillium sp.
The Ethanol (%99) and the aquatic solution for six medical plants was used in the study , these plants include :
Trigonella foenumgraceum ; Foeniculum vulgare mill; Mentha piperita L. ; Pimpinella anisum L. ; Rosa damascena ; Jasminum grandi florum.
All the aforementioned plants had prohibiting effect on (5) kinds(at least) of the microorganisms studied with different degrees of prohibition . The ethanol extract proved more powerful than aquatic extract . It was also found out that the prohibiting effect of the exract decreases with the decrease in it's concentration and differs according to the kind of bacteria and the kind of plant .
أ.د. أمل طالب عطيه السعدي | Prof. Dr. Amal Talib Atiyah Al Sa'ady | 7015