以提高冷冻面团的玻璃化转变温度(Tg’)为目的,研究了动态机械热分析仪(DMA)测定面团瑰’的方法,以及实验分析不同添加剂对面团您’的影响。结果显示:制备面团测试样品时,在其底部垫薄纸片,并将面团在DMA测试炉内冻结,然后,运用双重悬臂夹具测量面团瞻’,可以准确地检测面团玻璃化转变的“峰”;测试的添加剂均能使面团的强’提高,按张’高低大小排列依次为:抗坏血酸(-25.09℃)、硬脂酰乳酸钠(SSL)(-26.32℃)、海藻糖(-27.67%)、双乙酰酒石酸单(双)甘油酯(DATEM)(-27.69℃)、三聚磷酸钠(-28.12%)、磷酸二氢钠(-28.26%)、六偏磷酸钠(-29.35%)、沙蒿籽胶(-32.54℃)、瓜尔豆胶(-35.22℃)、卵磷酯(-39.56%)。在设计冷冻面团配方时,适量的添加这些添加剂,可以提高面团的强’,从而提高冷冻面团的储存稳定性。
For the purpose of increasing the glass transition temperature ( Tg ' ) of frozen dough, the method to measure the Tg' using dy- namic mechanical thermal analysis(DMA) , and experimental analysis of the impact of different additives on Tg ' of dough were studied. The dough samples padded with a tissue piece at the bottom were frozen in the DMA test furnace, and then measured using the dual canti- lever. The Tg' of dough can be accurately detected from the glass transition "peak". According to the Tg' level, the Tg ' of dough added with different additives were as follows: ascorbic acid ( -25.09℃), sodium stearoyl lactylate (SSL) ( -26. 32℃ ), trehalose ( - 27. 67℃), diacetyl tartaric acid esters of mono and diglycerides ( DATEM ) ( - 27.69℃), sodium tripolyphosphate ( - 28. 12~C ), sodium dihydrogen phosphate ( - 28.26℃) , six partial sodium ( - 29. 35℃ ) , Artemisia seed gum ( -32. 54℃ ) , guar gum ( - 35.22℃ ), lecithin ( - 39. 56~C ). In the design of the frozen dough recipe, the right amount of additives can improve Tg ' of dough, thereby improving the storage stability of frozen dough.