Physicochemical and microbial properties of orange-fleshed sweet potato flour produced with sun-drying and sulphiting agent

Ezeama C. F., . and Ogunka N. P., . and Ukpabi U. J., . Physicochemical and microbial properties of orange-fleshed sweet potato flour produced with sun-drying and sulphiting agent. pp. 315-320. ISSN 2550-2166

Many local Nigerian processors of sweet potato flour use sun-drying of the sliced roots in place of modern mechanical drying. This study used carotene-rich UMUSPO3 orange fleshed sweet potato (OFSP) variety that was newly bred at National Root Crop Research Institute (NRCRI) Umudike Nigeria to evaluate the possible effect of sun-drying and sulphiting on the physicochemical and microbial properties of OFSP flour samples. Data were obtained for OFSP sun-dried flour samples processed by different pretreatment methods (blanching sulphiting with sodium metabisulphite and a control). Results showed that the bacterial and fungal load of the sulphite-flour sample was 8.510�´ CFU/g and 4.0010�´ CFU/g while that of the control flour sample was 12.0010�´ CFU/g and 6.5010 CFU/g respectively. The total carotenoid content (TCC) of the flour samples ranged from 10.73 “ 11.68 mg/100 g while the TCC of the fresh (unprocessed) OFSP was 40.20 mg/100 g on dry matter basis. The proximate composition of the flour samples was 10.21 “ 10.95 moisture 8.18 “ 8.20 protein 2.40 -2.55 fibre 0.95 -1.11 fat and 1.73 “ 1.85 ash. Obtained physico-functional properties were 13.17 “ 13.23 g/mL swelling power 2.70 “ 3.4 g/mL oil absorption capacity 2.65 “ 2.85 g/mL water absorption capacity 77.50 “ 88.00C gelatinization temperature and 0.65 “ 0.66 g/mL bulk density

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Abstract

Many local Nigerian processors of sweet potato flour use sun-drying of the sliced roots in place of modern mechanical drying. This study used carotene-rich UMUSPO3 orange fleshed sweet potato (OFSP) variety that was newly bred at National Root Crop Research Institute (NRCRI) Umudike Nigeria to evaluate the possible effect of sun-drying and sulphiting on the physicochemical and microbial properties of OFSP flour samples. Data were obtained for OFSP sun-dried flour samples processed by different pretreatment methods (blanching sulphiting with sodium metabisulphite and a control). Results showed that the bacterial and fungal load of the sulphite-flour sample was 8.510�´ CFU/g and 4.0010�´ CFU/g while that of the control flour sample was 12.0010�´ CFU/g and 6.5010 CFU/g respectively. The total carotenoid content (TCC) of the flour samples ranged from 10.73 “ 11.68 mg/100 g while the TCC of the fresh (unprocessed) OFSP was 40.20 mg/100 g on dry matter basis. The proximate composition of the flour samples was 10.21 “ 10.95 moisture 8.18 “ 8.20 protein 2.40 -2.55 fibre 0.95 -1.11 fat and 1.73 “ 1.85 ash. Obtained physico-functional properties were 13.17 “ 13.23 g/mL swelling power 2.70 “ 3.4 g/mL oil absorption capacity 2.65 “ 2.85 g/mL water absorption capacity 77.50 “ 88.00C gelatinization temperature and 0.65 “ 0.66 g/mL bulk density

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Item Type:	Article
AGROVOC Term:	Sweet potatoes
AGROVOC Term:	Ipomoea batatas
AGROVOC Term:	Sweet potato flour
AGROVOC Term:	Drying
AGROVOC Term:	Carotenes
AGROVOC Term:	Carotenoids
AGROVOC Term:	Proximate composition
AGROVOC Term:	Physicochemical properties
AGROVOC Term:	Microbial properties
AGROVOC Term:	Flours
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/10071

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