食品添加剂对面团玻璃化转变温度的影响

实现食品的玻璃化贮藏是提高食品质量的有效手段。本研究利用差示扫描量热仪探讨了适用于面团玻璃化转变温度测量的扫描程序、研究了水分含量及若干食品添加剂对面团玻璃化转变温度的影响规律。结果表明,多次扫描法是一种可行的面团玻璃化转变温度的测量方法;水分添加量对面团的玻璃化转变温度有明显影响。在本研究的范围内,面团的玻璃化转变温度随面团水分含量的增加而明显下降。食品添加剂对面团的玻璃化转变温度有显著影响。添加抗坏血酸、海藻糖及明胶时,均可不同程度的使面团的玻璃化转变温度有所升高,这对于在现有储存条件下(-18℃)实现面制品的玻璃化保存,提高速冻面制品的稳定性,改善速冻面制品的质量有重要的应用价值。

Effects of Food Additives on Glass Transition Temperature of Wheat Dough

It has been suggested that the glass transition temperature might be a good indicator of food stability. The objectives of this study were to establish a suitable protocol for determining Tg values of wheat dough with differential scanning calorimeter (DSC), and to investigate the impacts of water content and food additives on the glass transition temperature of the wheat dough. The results indicated that the second-round scanning protocol is practical to detect the Tg of wheat dough. The results showed that as the moisture content increases, the glass transition temperature decreases linearly. Several food additives, e.g., L-ascorbicacid, trehalose, and glutin can significantly increase the Tg of wheat dough. These results are very useful to achieve a glassy-state condition during commercial storage facility (-18℃)and improve the quality of frozen food.