ABSTRACT
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 β-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.
TABLE OF CONTENTS
TITLE PAGE
CERTIFICATION
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
TABLE OF CONTENTS
CHAPTER ONE:
INTRODUCTION
CHAPTER TWO:
LITERATURE REVIEW
21 ORIGIN AND DISTRIBUTION OF SWEET POTATO
211 DESCRIPTION OF SWEET POTATO PLANT
212 USES OF SWEET POTATO
213 NUTRITIONAL VALUE OF SWEET POTATO
214 ANTI- NUTRITIONAL FACTORS
215 NUTRIENT COMPOSITION OF SWEET POTATO
2151 POLYPHENOLS COMPOSITION
2152 ANTI-OXIDATIVE, ANTI-MUTAGENICITY AND ANTI-CARCINOGENICITY
216 ANTI-DIABETES
217 ANTI-NUTRIENTS IN SWEET POTATO
218 ENZYME COMPOSITION OF SWEET POTATO
22 ORIGIN AND DISTRIBUTION OF SORGHUM PLANT
221 DISTRIBUTION OF SORGHUM PLANT
222 USES OF SORGHUM
223 ENZYME COMPOSITION OF SORGHUM
224 NUTRITIONAL COMPOSITION OF SORGHUM
225
ANTI-NUTRIENTS IN SORGHUM
CHAPTER THREE:
MATERIALS AND METHODS
31 MATERIALS
32 METHODOLOGY
321 PROCESSING OF SWEET POTATO TUBER
322 PROCESSING OF SORGHUM GRAIN
33 SWEET POTATO AND SORGHUM ANALYSIS
331 PROXIMATE ANALYSIS
3310 DETERMINATION OF FAT CONTENT
3311 DETERMINATION OF ASH CONTENT
3312 DETERMINATION OF CRUDE FIBRE
3313 DETERMINATION OF MOISTURE CONTENT
3314 DETERMINATION OF PROTEIN
3315 DETERMINATION OF CARBOHYDRATES
34 ANTI-NUTRIENTS AND PHYTOCHEMICALS
341 DETERMINATION OF TANNINS
342 DETERMINATION OF HYDROCYANIC ACID
343 DETERMINATION OF ANTHOCYANNINS
344 DETERMINATION OF PHYTATE/PHYTIC ACID
35 DETERMINATION OF MINERAL CONTENT
351 MAGNESIUM
352 IRON
353 ZINC
354 PHOSPHOROUS
355 POTASSIUM
36 DETERMINATION OF PASTING PROPERTIES
37 DETERMINATION OF PHENOL OXIDASE
38 DETERMINATION OF REDUCING SUGARS; FRUCTOSE, GLUCOSE AND SUCROSE
CHAPTER FOUR:
RESULTS AND DISCUSSION
41 TABLE 1: PROXIMATE COMPOSITION OF THE SAMPLES
AND DISCUSSION
42 TABLE 2: MINERAL COMPOSITION OF SAMPLES AND
DISCUSSION
43 TABLE 3: PHYTOCHEMICAL COMPOSITION OF THE
SAMPLES AND DISCUSSION
44 TABLE 4: PHYSICO-CHEMICAL PROPERTIES OF
SAMPLES AND DISCUSSION
44 TABLE 5: SUGAR COMPOSITION OF THE SAMPLES
AND DISCUSSION
CHAPTER FIVE:
CONCLUSION
REFERENCES
