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KMID : 0525720170220020110
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Journal of Chitin and Chitosan
2017 Volume.22 No. 2 p.110 ~ p.117
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Physicochemical Properties and Hot Air-Dried and Spray-Dried Powders Process of Sweet Potato and Steamed Sweet Potato
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Gu Yul-Ri
Chae Ho-Yong
Hong Joo-Heon
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Abstract
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This study was conducted to examine the physicochemical properties and hot air-dried and spray-dried powders process of sweet potato and steamed sweet potato. The moisture and the total starch contents were 1.66~2.19% and 52.65~57.42%, respectively. The total starch contents increased during process steaming. The water absorption index of the spray-dried powders (0.97 and 2.03) was lower than that of the hot air-dried powders (2.12 and 4.71), and the water solubility index of the spray-dried powders (83.83 and 86.95%) was higher than that of the hot air-dried powders (68.40 and 81.21%). The particle size and outer topology of the spray-dried powders were 46.18 and 65.53 μm, and its shape was generally globular. In the DSC analysis of this study, the To of the spray-dried powders (64.40 and 67.80℃), Tp of the spray-dried powders (74.40 and 78.20℃), and Tc of the spray-dried powders (81.10 and 81.60℃) was higher than that of the hot air-dried powders. The solubility contents of the spraydried powders (68.21 and 80.73%) was lower than that of the hot air-dried powders, and the swelling power contents of the spray-dried powders (14.79 and 15.35%) was higher than that of the hot air-dried powders. The amylose contents of spray-dried powders (11.67 and 12.51%) was lower than that of the hot air-dried powders. The soluble dietary fiber contents of spray-dried powders (1.34 and 2.02%) was higher than that of the hot air-dried powders.
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KEYWORD
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Physicochemical properties, Spray drying, Hot air drying, Sweet potato, Steamed sweet potato
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