کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1387109 | 982545 | 2011 | 6 صفحه PDF | دانلود رایگان |
Effects of moisture content, molecular weight (MW), and crystallinity on the glass transition temperature (Tg) and freeze-concentrated glass-like transition temperature (T′gT′g) of a fructan (inulin) were investigated using differential scanning calorimetry. The Tg of inulin samples decreased with increasing moisture content. The Tg of semi-crystal inulin was higher than that of amorphous inulin. These results were fitted to the Gordon–Taylor equation, and k values, reflecting the sensitivity to the water plasticizing effect, were obtained. The k value was plotted against anhydrous Tg, and the relationship of amorphous inulin was described with a linear function. Tg of anhydrous inulin samples and T′gT′g of inulin–water mixtures increased with increasing MW, and the results were described empirically by a stretched exponential equation. These results will help to predict Tg and T′gT′g of inulin, depending on the moisture content, MW, and crystallinity.
Journal: Carbohydrate Polymers - Volume 83, Issue 2, 10 January 2011, Pages 934–939