Influence of DE-value on the physicochemical properties of maltodextrin for melt extrusion processes

麦芽糊精 增塑剂 玻璃化转变 分散性 化学 相对湿度 流变学 挤压 山梨醇 化学工程 材料科学 色谱法 高分子化学 聚合物 有机化学 喷雾干燥 热力学 复合材料 物理 工程类
作者
Natalia Castro Gutierrez,Vanessa Durrieu,C. Raynaud,Antoine Rouilly
出处
期刊:Carbohydrate Polymers [Elsevier BV]
卷期号:144: 464-473 被引量:107
标识
DOI:10.1016/j.carbpol.2016.03.004
摘要

In this study, five different types of maltodextrins (DE-2, DE-6, DE-12, DE-17 and DE-19) were characterized for the physico-chemical properties. TGA, DVS and SEC analyses were carried out and additionally apparent melt-viscosity (in a micro-extruder) and the glass transition temperature (analyzed by DMA) of maltodextrin/plasticizer mixtures were also measured in order to evaluate both the effect of plasticizer nature and content and the effect of the DE-value. For this, three plasticizing agents were compared: water, d-sorbitol and glycerin. The adsorption isotherms showed that depending on the DE-value and the relative humidity they were exposed to, different behavior could be obtained. For example, for relative humidities below 60% RH maltodextrin DE-2 was the least hygroscopic. And on the contrary for relative humidities above 75% RH maltodextrin DE-2 was the most hygroscopic. The rheology measurements showed that the viscosity decreased with the increase of the DE-value and with the plasticizer content, as expected. On the contrary, no direct correlation could be established between the DE-value and the glass transition temperature. These results demonstrated that to predict maltodextrins behavior and to better adapt the process conditions, combined analyses are mandatory as the DE-value alone is not sufficient. The most compelling evidence was obtained by size exclusion chromatography, which pointed out that maltodextrins had a bimodal molecular weight distribution composed of high and low molecular weight oligo-saccharides. Indeed, maltodextrins are highly polydisperse materials (i.e. polydispersity index ranging from 5 to 12) and that should be the reason why such distinct behaviors were observed in some of the physico-chemical analyses that were preformed.
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