Physicochemical and functional properties of flour from twelve varieties of Ghanaian sweet potatoes

Koch, K.; Akonor, P. T; Menzel, C.; Adofo, K.; Tortoe, C.

Physicochemical and functional properties of flour from twelve varieties of Ghanaian sweet potatoes

2017

Koch, K. | Akonor, P. T | Menzel, C. | Adofo, K. | Tortoe, C.

Physicochemical and functional properties of flours produced from 12 varieties of sweet potatoes had colour indicating Apomuden (AP) as the darkest (L* values 83.6) and Ligri (GR) as the lightest (L* values 89.4) of the flours. The moisture content ranges from 7.6 to 10% below 15% specified for flours. Water activity was ranged from 0.5 to 0.6, an indication of shelf-stable flours. The varieties Faara (CFA) and Sauti (SAT), which had high amounts of moisture were also similar in their water activities. The pH of the flours ranged from 5.8 to 6.2, indicating low acidity. The flours indicated easy-to-cook properties as their pasting temperature was between 79 and 84°C. Peak viscosity ranged between 75 and 304 RVU while setback viscosity ranged from 49 to 148RVU. AP had lower pasting properties but showed the least tendency to retrograde, with a setback ratio of 1.4. Ligri (GR) and Histarch (HI) showed the highest peak viscosity (304 and 300RVU) whereas flour from Bohye (BO) and Otoo (OT) were the most stable. The flours possess physicochemical and functional properties that makes them applicable in a wide array of food and industrial purposes.

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