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ENUMERATION, ISOLATION AND CHARACTERIZATION OF BACILLUS SPECIES FROM PASTEURIZED BOTTLED MILK DRINKS MARKETED IN AGO-IWOYE, OGUN STATE
Categories
Table of contents
Title Page i
Abstract v
Certification ii
Dedication iii
Acknowledgement iv
Table of Contents vi
CHAPTER ONE 1
1.1 Introduction 1
1.2 Aim of the Study 4
1.3 Specific Objectives 4
CHAPTER TWO: LITERATURE REVIEW 5
2.1 The Genus Bacillus 5
2.1.1 The Bacillus cereus Group 6
2.1.2 The Bacillus subtilis Group 8
2.2 Pathogenic and Toxigenic Characteristics 9
2.3 Effects of Bacillus species on Human Health 13
2.4 Incidence of Bacillus Species from Milk Products 15
2.5 Spoilage of Fluid Milk Products 16
2.6 Prevention and Control Measures 16
2.6.1 Prevention of Spoilage in Milk 16
CHAPTER THREE: MATERIALS AND METHOD 20
3.1 Collection of Samples 20
3.2 Sterilization of Glass wares 21
3.3 Preparation of Media 21
3.4 Isolation of Bacillus Species 21
3.5 Identification and Characterization of Bacillus spp. 22
3.5.1 Gram Staining 22
3.5.2 Catalase Test 23
3.5.3 Oxidase Test 24
3.5.4 Motility 24
3.5.5 Kligler Iron Agar Test 24
CHAPTER FOUR: RESULTS 26
CHAPTER FIVE 30
5.1 Discussion 30
5.2 Conclusion and Recommendations 32
REFERENCES 33
LIST OF TABLES
Table Title Page
4.1 Total Bacterial Count of Milk Drinks 27
4.2 Biochemical Characterization of Isolates 28
4.3 Frequency and Percentage of Occurrence of Isolated Organisms
from Milk Samples 29
Abstract
This study was carried out to enumerate the microbial loads in pasteurized bottled milk drinks. The microbial load was determined by serial dilution and spread plate techniques while the isolation and identification of Bacillus species was done using Mannitol Yolk Polymyxin and conventional biochemical methods. Four out of the nine products sampled had no microbial growth while the remaining five had total viable count that ranged from 8.0 x 106 to 1.32 x 107 cfu/ml. The highest load was discovered in BBStar while the lowest microbial load was discovered in Bobo. Five species of Bacillus were isolated out of which four were Bacillus cereus and one were Bacillus subtilis. The high microbial load and isolation of Bacillus species in these pasteurized milk drinks pose a major threat to consumers of these products.
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