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Properties of Dangmyuns Using Different Starches and Freeze Dried Dangmyuns  

Lee, Young-Chul (Korea Food Research Institute)
Oh, Se-Wook (Korea Food Research Institute)
Han, Seung-Bae (Cheildonggun Ind. Co. Ltd.)
Han, Sun-Dong (Cheildonggun Ind. Co. Ltd.)
Kang, Nam-Kil (Cheildonggun Ind. Co. Ltd.)
Publication Information
Korean Journal of Food Science and Technology / v.34, no.1, 2002 , pp. 24-29 More about this Journal
Abstract
The study was performed to investigate the degrees of gelatinization at various processing steps during the preparation of Dangmyuns using sweet potato, potato, corn and tapioca starches, and also determined the rehydration of the freeze dried sweet potato Dangmyun. The degrees of gelatinization after extrusion cooking showed higher value than other processing steps. The degrees of gelatinization after extrusion cooking were 63.5% in sweet potato, 80.0% in potato, 82.3% in corn, and 86.5% in tapioca Dangmyuns. The degree of gelatinization in Dangmyuns after extrusion cooking step decreased as the processing steps, such as cold storage, freezing, thawing, and sun drying, progressed. L values of color in Dangmyuns decreased in the order of corn>tapioca>potato>sweet potato Dangmyuns. The cooking loss decreased in the order of tapioca>corn>potato>sweet potato Dangmyuns. The percentage of weight gain was the highest in sweet potato Dangmyun followed by corn, potato, and tapioca Dangmyuns. The water absorption rate constant was the highest in sweet potato Dangmyun followed by corn, potato, and tapioca Dangmyuns. In the rehydration of freeze dried Dangmyuns, freeze dried sweet potato Dangmyun showed better than the others. An increase from 60% to 70% of the added amount of water in the mixing step resulted in an increase of the degrees of gelatinization after extrusion cooking from $63.4{\sim}70.7%$ to $73.8{\sim}75.0%$. An increase of the added water in the mixing step and a decrease of diameter in the extrusion cooking step slightly improved the rehydration in the boiled water of freeze dried sweet potato Dangmyun.
Keywords
Dangmyun; sweet potato; potato; corn; tapioca; degree of gelatinization; freeze dried;
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