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Thermal properties measurements of renatured gelatin using conventional and temperature modulated differential scanning calorimetry

机译:使用常规和温度调制差示扫描量热法测量变性明胶的热性能

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摘要

The thermal properties of amorphous gelatin films and gelatin films with renatured structural order were measured by using conventional and temperature modulated differential scanning calorimetry (DSC). Different amounts of gelatin structural order associated with a melting enthalpic change in the DSC measurement were prepared based on different gelatin drying conditions. Two consecutive heating and cooling DSC measurements on the gelatin films showed that there was no change in the glass-transition temperature (T-g) for the amorphous gelatin but there was a decrease in the T-g for the structural gelatin on the second DSC scan. This decrease was attributed to the plasticizing effect from the release of originally hydrogen-bonded water associated with the structural gelatin. In addition, a reversing endotherm observed upon melting of the structural gelatin during a temperature modulated DSC measurement indicated that the transition of bound water to free water occurred as the partial triple-helix gelatin melted. (c) 2006 Wiley Periodicals, Inc.
机译:通过使用常规和温度调制差示扫描量热法(DSC)测量非晶态明胶膜和具有复性结构顺序的明胶膜的热性能。基于不同的明胶干燥条件,制备了与DSC测量中的熔融焓变相关的不同量的明胶结构顺序。在明胶薄膜上进行的连续两次加热和冷却DSC测量表明,无定形明胶的玻璃化转变温度(T-g)没有变化,但结构性明胶的T-g在第二次DSC扫描中却降低了。该减少归因于与结构明胶相关的最初氢键结合水的释放所产生的增塑作用。另外,在温度调节的DSC测量期间在结构明胶熔化时观察到的反向吸热表明,当部分三螺旋明胶熔化时,结合水向游离水的转变发生。 (c)2006年Wiley Periodicals,Inc.

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