کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
674792 | 1459575 | 2010 | 9 صفحه PDF | دانلود رایگان |
A state diagram of bovine gelatin was developed by measuring the freezing curve, glass transition, unfolding, solids-melting lines, and ultimate maximum-freeze-concentration conditions. The freezing point decreased with the increase of solids; whereas glass transition, unfolding, and solids-melting decreased with the decrease of solids up to solids content 0.84 g/g gelatin and then remained constant. The freezing point, glass transition and solids-melting were modeled by Chen's model based on the Clausius-Clapeyron equation, modified Gordon-Taylor model, and Flory's equation, respectively. The ultimate maximum-freeze-concentration conditions were found as (T′m)u(T′m)u equal to −11.9 °C and (T‴g)u(T‴g)u equal to −14.9 °C, and the characteristic solids content, X′sX′s as 0.80 g/g sample (i.e. un-freezable water, X′wX′w = 0.20), respectively. Similarly the value of Tgiv (i.e. intersection of vertical line passing through T′mT′m and glass transition line) was estimated as 34 °C.
Journal: Thermochimica Acta - Volume 509, Issues 1–2, 20 September 2010, Pages 111–119