Abstract
In this study, physical and chemical properties (dry matter, ash, moisture, protein, fat, fiber, carbohydrate, starch, amylose, and vitamin C) of sweet potato tuber and flour of Anggun 1 cultivar were evaluated at different conditions. During peeling, the tuber and flour were processed subjected to three different conditions, which were unpeeled tubers (C1), peeled tubers (C2), and skin of tuber only (C3). From the results, the highest (p < 0.05) dry matter was observed in C1 while higher contents of ash, moisture, and protein were found in C3. Regarding the fat and vitamin C content, no significant differences (p > 0.05) were found between each condition. The highest fiber, carbohydrate, and amylose content (p < 0.05) were found in C1. The C1 and C2 reflected significantly higher (p < 0.05) starch content. Overall, these results provide important information about the peeling effect on the physical and chemical properties of Anggun 1. The information could be used as adding value to healthy food in the Malaysian diet due to the nutritional value of sweet potato.
Highlights
Sweet potato tubers (Ipomoea batatas) belong to the family of Morning glories and genusIpomoea
The highest Dry Matter Content (DM) was found in C1 and it was parallel to the reported data by [22], where they found DM of unpeeled tuber ranged from 21.80 to 36.53%
After the skin was peeled, sweet potato showed a significant reduction of DM content by 33.67% in C2
Summary
Sweet potato tubers (Ipomoea batatas) belong to the family of Morning glories and genusIpomoea. In 2017, MARDI had released three types of Anggun viz. Anggun 1, Anggun 2, and Anggun 3 These varieties have purple skin and flesh. [2] In this research, Anggun 1 was selected as the sample during the study This is because the production of Anggun 1 is quite high compared to other types of Anggun. The long and elliptical shape of Anggun 1 is the ideal one and fulfills the market demand. It has high anthocyanin content, capable to survive in low-fertility soil, as well as tolerant to drought and disease, which makes it one step further than other varieties of sweet potato
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