EFFECTS OF PROCESSING METHODS ON THE PHYSICOCHEMICAL PROPERTIES OF SWEET POTATO AND SORGHUM

This study evaluated "the effects of processing methods on the physicochemical
properties of sweet potato and sorghum flour". Sweet potato
(Ipomoea batatas) is an important food crop in the tropical and sub-tropical
countries and belongs to the family convolvulaceae. Sweet potatoes are rich
in dietary fiber, minerals, vitamins, and anti oxidants such as phenolic acids,
anthocyannins, tocopherol and ÎÂ�-carotene. The proximate composition of
sweet potato was determined and these include moisture, lipids, ash, protein,
carbohydrates and fiber. In carrying out the analysis practically, methods
used vary according to the food material. The anti oxidants were also
determined alongside with phenol oxidase, pasting properties, minerals and
sugar contents. Sorghum is a tropical plant belonging to the family of
poaceae. More than 35% of sorghum is grown for human consumption. The
analyses carried out in sweet potatoes are same with sorghum with the
exclusion of phenol oxidase.

TITLE PAGE

CERTIFICATION

DEDICATION

ACKNOWLEDGEMENT

ABSTRACT

TABLE OF CONTENTS

CHAPTER ONE: 

INTRODUCTION

LITERATURE REVIEW

2.1. ORIGIN AND DISTRIBUTION OF SWEET POTATO

2.1.1. DESCRIPTION OF SWEET POTATO PLANT

2.1.2. USES OF SWEET POTATO

2.1.3. NUTRITIONAL VALUE OF SWEET POTATO

2.1.4. ANTI- NUTRITIONAL FACTORS

2.1.5. NUTRIENT COMPOSITION OF SWEET POTATO

2.1.5.1. POLYPHENOLS COMPOSITION

2.1.5.2. ANTI-OXIDATIVE, ANTI-MUTAGENICITY AND ANTI-CARCINOGENICITY

2.1.6. ANTI-DIABETES

2.1.7. ANTI-NUTRIENTS IN SWEET POTATO

2.1.8. ENZYME COMPOSITION OF SWEET POTATO

2.2. ORIGIN AND DISTRIBUTION OF SORGHUM PLANT

2.2.1. DISTRIBUTION OF SORGHUM PLANT

2.2.2. USES OF SORGHUM

2.2.3. ENZYME COMPOSITION OF SORGHUM

2.2.4. NUTRITIONAL COMPOSITION OF SORGHUM

2.2.5. ANTI-NUTRIENTS IN SORGHUM

MATERIALS AND METHODS

3.1. MATERIALS

3.2. METHODOLOGY

3.2.1. PROCESSING OF SWEET POTATO TUBER

3.2.2. PROCESSING OF SORGHUM GRAIN

3.3. SWEET POTATO AND SORGHUM ANALYSIS

3.3.1. PROXIMATE ANALYSIS

3.3.1.0. DETERMINATION OF FAT CONTENT

3.3.1.1. DETERMINATION OF ASH CONTENT

3.3.1.2. DETERMINATION OF CRUDE FIBRE 

3.3.1.3. DETERMINATION OF MOISTURE CONTENT

3.3.1.4. DETERMINATION OF PROTEIN

3.3.1.5. DETERMINATION OF CARBOHYDRATES

3.4. ANTI-NUTRIENTS AND PHYTOCHEMICALS

3.4.1. DETERMINATION OF TANNINS

3.4.2. DETERMINATION OF HYDROCYANIC ACID

3.4.3. DETERMINATION OF ANTHOCYANNINS

3.4.4. DETERMINATION OF PHYTATE/PHYTIC ACID

3.5. DETERMINATION OF MINERAL CONTENT

3.5.1. MAGNESIUM

3.5.2. IRON

3.5.3. ZINC

3.5.4. PHOSPHOROUS

3.5.5. POTASSIUM

3.6. DETERMINATION OF PASTING PROPERTIES

3.7. DETERMINATION OF PHENOL OXIDASE

3.8. DETERMINATION OF REDUCING SUGARS; FRUCTOSE, GLUCOSE AND SUCROSE 

RESULTS AND DISCUSSION

4.1. TABLE 1: PROXIMATE COMPOSITION OF THE SAMPLES

 AND DISCUSSION

4.2. TABLE 2: MINERAL COMPOSITION OF SAMPLES AND

 DISCUSSION

4.3. TABLE 3: PHYTOCHEMICAL COMPOSITION OF THE

SAMPLES AND DISCUSSION

4.4. TABLE 4: PHYSICO-CHEMICAL PROPERTIES OF

 SAMPLES AND DISCUSSION

4.4. TABLE 5: SUGAR COMPOSITION OF THE SAMPLES

AND DISCUSSION

CHAPTER FIVE: 

CONCLUSION