A study of the physical and chemical properties of extruded sweet potato-rice products. A poster presentation in the International Workshop of Safety and Wholesomeness of Cereal Foods

in Domestic Conference (poster paper), 國內研討會(全文海報發表)
標題A study of the physical and chemical properties of extruded sweet potato-rice products. A poster presentation in the International Workshop of Safety and Wholesomeness of Cereal Foods
出版類型國內研討會(全文海報發表)
出版年度2007
AuthorsJenshinn Lin, 林貞信
出版日期Nov 27 2007 12:0
會議地點屏東
其他編號0000
中文摘要

Rice is the plant of Oryza of the grass family (Gramineae). It is one of the important grains in the world, and also the main food of the people in Asia. According to the agricultural statistics yearbook of 2005, the total production of sweet potato (Ipomoea batatas (L.) Lam) ranked first in the coarse grains in Taiwan. The sweet potato is said to be nutritious, and rich in dietary fiber. However, its high moisture content would result in the deterioration during the storing period, and make the quality of the products wayward. In this research, by taking the advantage of heating, mixing, and shaping of extrusion technology, the brown rice and sweet potato were processed for the sweet-potato-rice products, which would increase the eating convenience of the consumers. This research intends to investigate the effects of feed moisture content and feed composition (rice: sweet potato=1:1, 1:2, 2:1) on the quality of extruded products. According to results of the study, the moisture contents of the sweet-potato-rice extrudates were all decreased at different feed moisture contents and compositions. Under the extrusion condition of 15% feed moisture content and 1:2 feed composition, the obtained extrudates had the lowest moisture content 8.624%. Under the extrusion condition of 15% feed moisture content and 2:1 feed composition, the obtained extrudates had the lowest Aw (0.551) and density (0.327 g/cm3), whereas the highest white index (63.43). As to the yellowness (b value), extrudates obtained at the condition of 21% feed moisture content and 1:2 feed composition were the highest (23.70). The extrudates processed by different FMC at FC 1:1 all have the highest solubility at 95℃and swelling power at 65℃.

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