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ISOLATION AND CHARACTERIZATION OF STAPHYLOCOCUS SPECIES IN MILK DRINKS MARKETED IN IJEBU ODE, OGUN STATE.
Categories
Table of contents
CHAPTER ONE 1
1.1 Introduction 1
1.2 Aim and Objective of the Study 4
1.3 Specific Objectives 4
CHAPTER TWO: Literature Review 5
2.1 Health Benefit of Milk 6
2.2 Pasteurization 7
2.2.1 Purpose of Pasteurization 8
2.2.2. Methods of Pasteurization 9
2.3 Staphylococcus aureus 10
2.3.1. Virulence characteristics of S. aureus 11
2.3.2. Toxins 12
2.4 Staphylococci and Food Poisoning 13
2.5 Occurrence of Staphylococcus in Milk Products 15
CHAPTER THREE: Materials and Method 20
3.1 Collection of Samples 20
3.2 Sterilization of Glasswares 20
3.3 Preparation of Media 21
3.4 Isolation of Staphylococcus species 21
3.5 Identification and Characterization of isolates. 22
3. 5.1 Gram Staining 22
3.5.2 Catalase Test 23
3.5.3 Coagulase Test 24
3.5.4 Oxidase Test 24
3.5.5 Sugar Fermentation Tests 24
3.5.6 DNASE Test 25
CHAPTER FOUR: Results 26
4.1 Identification of Staphylococcus spp. 26
CHAPTER FIVE: Discussion, Conclusion and Recommendations 30
5.1 Discussion 30
5.2 Conclusion and Recommendations 33
References 34
LIST OF TABLES
Table Title Page
3.1 Code of the samples 20
4.1 Total Viable Count of pasteurized the Milk product marketed in
Nigeria. 27
4.2 Morphological and Biochemical characterization of Staphylococcus species
isolated from milk products 28
4.3 Frequency and Percentage of Occurrence of Isolated Organisms from
Milk Samples 29
Abstract
Milk is nutritious and an essential food for man as well as a good medium for microbial growth and contamination. The study was designed to determine the microbial and prevalence of Staphylococcus species in pasteurized milk drinks marketed in Ijebu- ode, Ogun state. The microbial loads in these milk drinks were determined and the isolation and identification of Staphylococcus species was done on Manitol Salt Agar using spread plate technique and the conventional biochemical methods. Five out of the nine products analyzed had bacteria growth while the remaining four had no growth. Total viable counts observed from the five products with bacterial growth ranging from 4.0 x 105 to 1.5 x106 cfu/ml with Cway milk drink having the highest microbial load. A total of five Staphylococcus species were isolated out of which three were S. aureus and two were S. epidermis. The high microbial loads and isolation of Staphylococcus spp. in these pasteurized milk drink pose a health risks to consumers.
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