• Korean Journal of Food Science and Technology
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• v.29 no.2
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• pp.218-222
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• 1997

Twelve varieties of yellow sweet potatoes were measured for carotenoids content to assess their potential as a source of natural food colorant. Benihayato variety had the highest content of carotenoids (20.2 mg/100 g fr wt) but other varieties ranged with $4.6{\sim}16.7\;mg/100\;g$ fr wt. Hunter's +a-values (redness) increased linearly $(R^{2}=0.826)$ with carotenoids content of yellow sweet potatoes. Absorption spectrum of carotenoids extracted from the Benihayato variety was similar to that of standard ${\beta}-carotene$ indicating that carotenoids in yellow sweet potato are mostly composed of ${\beta}-carotene$.

• Journal of the Korean Society of Food Science and Nutrition
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• v.27 no.4
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• pp.596-602
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• 1998

Two kinds of sweet potato puree were prepared with Benihayato cultivar of yellow sweet potato with or without $\alpha$-amylase enzyme treatment. Chemical and rheological properties of enzyme-treated puree were different from those of control puree. Reducing sugar content and iodine value increased by $\alpha$-amylase enzyme treatment, while alcohol insoluble solids and viscosity decreased by enzyme treatment. However, the changes of carotenoid content were not significantly different. Hunter-b-values(yellowness) were 27.19 and 23.54 for no enzyme-treated puree(NTP) and enzyme-treated puree(ETP), respectively. Hunter-a values(redness) were 2.24 and 6.05 for NTP abd ETP, respectively. Content of total carotenoid of canned puree heated at 13$0^{\circ}C$ for 30 min decreased by 59 percents.