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TABLE OF CONTENTS DECLARATION iv ACKNOWLEDGEMENTS v LIST OF TABLES vi LIST OF FIGURES vii LIST OF APPENDICES viii ABSTRACT ix CHAPTER 1: INTRODUCTION CHAPTER 2: LITERATURE REVIEW iii Page 2.1 Introduction 4 2.2 Herbal teas 5 2.3 Medicinal significance of herbal teas 7 2.4 Antioxidants 8 2.5 Natural vs. synthetic antioxidants 9 2.5.1 Dangers of synthetic antioxidants 11 2.5.2 Natural vs. synthetic vitamin E 11 2.6 Solubility of Antioxidants 13 2.7 Antioxidant activities of polyphenols 14 2.8 Factors affecting antioxidant activities 17 2.8.1 Structures of antioxidants 17 2.8.2 Processing 19 2.8.3 Synergy 20 2.9 Measurements of total antioxidant activities 21 2.9.1 DPPH antiradical method 21 2.9.2 ABTS antiradical method 24 2.10 Antioxidant efficiency 25 2.11 Summary and conclusions 26 1
CHAPTER 3: RESPONSE OF TOTAL ANTIOXIDANT CONTENT IN BUSH TEA (ATHRIXIA PHYLICOIDES DC) TO NITROGEN, PHOSPHORUS AND POTASSIUM NUTRITION AS AFFECTED BY SEASON 3.1 Introduction 28 3.2 Materials and methods 29 3.2.1 Preparation of leaf extracts for total antioxidant content 29 3.2.2 Determination of total antioxidant content 29 3.2.3 Statistical Analysis 30 3.3 Results and discussion 30 3.3.1 Nitrogen experiments 30 3.3.2 Phosphorus experiments 31 3.3.3 Potassium experiments 32 CHAPTER 4: SUMMARY AND CONCLUSIONS 35 REFERENCES 37 APPENDICES 54 iv
Page 1: Effects of Nitrogen, Phosphorus and
Page 5 and 6: ACKNOWLEDGEMENTS I would like to ac
Page 7 and 8: LIST OF FIGURES viii Page Figure 2.
Page 9: ABSTRACT Bush tea (Athrixia phylico

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