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ASSESSMENT OF MICROBIAL LOAD AND SPECTRUM ON SURFACES OF SOME INDIGENOUS KITCHEN UTENSILS

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Table of contents

CHAPTER ONE: INTRODUCTION                                                                     1

1.1       Background to the Study                                                                                1

1.2       Aim and Objectives                                                                                        7

1.3       Significance of the Study                                                                               7

CHAPTER TWO: LITERATURE REVIEW                                                        8

CHAPTER THREE: MATERIALS AND METHODS                                        16

3.1       Materials                                                                                                         16

3.1.1    Microorganisms                                                                                              16

3.1.2    Media                                                                                                              16

3.1.3    Chemicals                                                                                                       16

3.1.4    Equipment                                                                                                      16

3.2       Methods                                                                                                          17

3.2.1    Sample collection                                                                                           17

3.2.2    Isolation of Microorganisms                                                                          17

3.2.3    Characterization and Identification of Biochemical Characteristics            18

3.2.3.1 Gram Staining                                                                                                18

3.2.3.2 Lactophenol Staining                                                                                      19

3.2.3.3 Biochemical tests                                                                                            19

CHAPTER FOUR: RESULTS                                                                                20

4.1       Results                                                                                                            20

CHAPTER FIVE: CONCLUSION                                                                         28

5.1       Conclusion                                                                                                      28

References                                                                                                                  29

LIST OF TABLES

TABLE NUMBER                            TITLE                                                            PAGE

Table 4.1: Microbial counts recovered from household grinding stones samples           21

Table 4.2: Biochemical tests on isolates recovered from household Grinding stones samples                                                                                                                     22

Table 4.3: Microbial counts recovered from household Mortars samples                       23

Table 4.4: Biochemical Tests on isolates recovered from household mortars samples.                                                                                                                                                                                                                                                       24

Table 4.5: Microbial counts recovered from household pestles samples                         25

Table 4.6: Biochemical Tests on isolates recovered from pestles samples                       26

Table 4.7: Morphological characterization of fungal isolates                                    27

Abstract

This study assessed the microbial load and spectrum on the surfaces of indigenous kitchen utensils (pestles, mortars and grinding stones). It also evaluated the rate of contamination of the indigenous kitchen utensils with bacteria, fungi and coliforms. 

A total number of 60 samples were collected from surfaces of pestles, mortars and grinding stones by swabbing with sterile swab sticks from different households. The samples were collected before washing and after washing with distilled water. The samples were labelled correctly, packed in a sterile polythene bag and transported to the microbiology laboratory in Olabisi Onabanjo University, for further analysis.

The results showed that bacterial species such as Staphylococcus aureus,Escherichia coli, Klebsiella pnuemoniae, among others and were prevalent on the surfaces of the kitchen utensils. 

The presence of these bacterial species could create health hazards when they come in contact with food during preparation and production. Improper handling and poor maintenance of these utensils by members of the households increase the risk of contamination.

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