通过热塑性混合和热模塑用甘油和水增塑的小麦面筋基材料。

PubMed ID
发表日期 2011年Mar月

原始出处 食品与农业科学杂志
Journal of the science of food and agriculture
作者 Zárate-Ramírez  Lidia S  Martínez  Inmaculada  Romero  Alberto  Partal  Pedro  Guerrero  Antonio 

文献标题 通过热塑性混合和热模塑用甘油和水增塑的小麦面筋基材料。
Wheat gluten-based materials plasticised with glycerol and water by thermoplastic mixing and thermomoulding.

文献摘要 BACKGROUND

面筋是一种可再生的、可利用的、低成本的原材料,因此被认为是生物可降解高分子材料的来源。本研究的目的是评估蛋白质/增塑剂热机械加工的两个阶段中涉及的一些变量的影响,其中甘油和水的混合物被用作增塑剂。

RESULTS

在不同热条件下混合的谷蛋白/甘油/水混合物(绝热温度从25℃开始°在60和90℃等温°C) 表现出剪切变稀的毛细管流动特性,在最高温度下流动特性显著增加。通过调制差示扫描量热法(MDSC)和动态力学分析(DMA)检测了两种热事件,即与增塑剂共混物和面筋有关的玻璃化转变。中等的模塑温度使材料表现出更高的延展性,而较高的混合和模塑温度使生物塑料具有更高的力学性能。

CONCLUSION

模压温度为130度°发现C(接近变性温度)适合于热成型工艺。此外,对于那些要求材料表现出高吸水性和适当机械性能的应用,使用中等混合温度似乎很方便。蛋白质可提取性结果反映了在加工过程中结合高剪切和高温以改善交联反应的优点。


BACKGROUND

Gluten has been investigated as a source for biodegradable polymeric materials because it is a renewable, available and low-cost raw material. The aim of this study was to evaluate the influence of some variables involved in the two stages of protein/plasticiser thermo-mechanical processing, where a mixture of glycerol and water was used as the plasticiser.

RESULTS

Gluten/glycerol/water blends mixed under different thermal conditions (adiabatic starting at 25 °C and isothermal at 60 and 90 °C) exhibited shear thinning capillary flow behaviour, where a marked increase in flow properties was obtained at the highest temperature. Two thermal events, glass transitions related to the plasticiser blend and gluten, were detected by Modulated Differential Scanning Calorimetry (MDSC) and Dynamic Mechanical Analysis (DMA) tests. Moderate moulding temperature led to less resistant materials showing higher ductility, whereas higher mixing and moulding temperatures led to bioplastics with higher mechanical properties.

CONCLUSION

A moulding temperature of 130 °C (close to the denaturation temperature) was found to be suitable for the thermomoulding process. In addition, the use of moderate mixing temperature seems to be convenient for those applications that required materials exhibiting high water absorption behaviour and suitable mechanical properties. Protein extractability results reflect the benefits of combining high shear and high temperature during processing to improve cross-linking reactions.


获取全文 10.1002/jsfa.4224