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首页> 外文期刊>Crystal growth & design >Unraveling the Wide Variation in the Thermal Behavior of Crystalline Sucrose Using an Enhanced Laboratory Recrystallization Method
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Unraveling the Wide Variation in the Thermal Behavior of Crystalline Sucrose Using an Enhanced Laboratory Recrystallization Method

机译：使用增强的实验室重结晶方法解开结晶蔗糖的热行为的广泛变化

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摘要

Recently, we found that sucrose from beet sources exhibited only one large endothermic DSC peak, whereas sucrose from most cane sources exhibited two peaks. Thus, our objective was to unravel the cause of this wide variation in thermal behavior by investigating both commercial and recrystallized sucrose samples, using a variety of analytical techniques, including DSC, HPLC, SXRD, and Micro-CT. With the aid of recrystallization method enhancements and compositional changes, sucrose crystals were intentionally altered to produce a variety of thermal behaviors, including DSC curves exhibiting one or two endothermic peaks or a single peak with either a low (144 °C) or a high (190 °C) Tmonset value. SXRD results for all sucrose crystals studied were consistent with the known structure of sucrose. Thus, polymorphism is not the cause of thermal behavior variation, but rather, the variation is attributed to the influence of occlusion composition and chemistry on thermal decomposition. Micro-CT supported this assertion by revealing the development of large cavities within the sucrose crystal during heat treatment when occlusion composition and chemistry was conducive to thermal decomposition (e.g., low ash content and pH), but showed impeded cavity formation when occlusions contained inhibitory attributes (e.g., high ash content, sulfite, or water removal via grinding).
机译：最近，我们发现，来自甜菜源的蔗糖仅表现出一个大的吸热DSC峰，而来自大多数甘蔗源的蔗糖表现出两座峰。因此，我们的目标是通过使用各种分析技术研究商业和再结晶蔗糖样品来解开热行为的这种宽变化的原因，包括DSC，HPLC，SXRD和MICRO-CT。借助重结晶方法增强和组成变化，有意地改变蔗糖晶体以产生各种热行为，包括表现出一种或两个吸热峰的DSC曲线或具有低（144℃）或高（ 190°C）TMONSET值。研究的所有蔗糖晶体的SXRD结果与已知的蔗糖结构一致。因此，多态性不是热行为变异的原因，而是归因于闭塞组合物和化学对热分解的影响。微型CT通过揭示热处理期间蔗糖晶体内的大型空腔的发育，当闭塞组合物和化学有利于热分解时（例如，低灰分含量和pH），但在闭塞时显示受阻腔形成时（例如，通过磨削的高灰分含量，亚硫酸盐或除水）。

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  • 来源
    《Crystal growth & design》 |2018年第2期|共12页
  • 作者

    Yingshuang Lu; Danielle L. Gray; Leilei Yin; Leonard C. Thomas; Shelly J. Schmidt;

  • 作者单位

    Department of Food Science and Human Nutrition University of Illinois at Urbana?Champaign 399A Bevier Hall 905 South Goodwin Avenue Urbana Illinois 61801 United States;

    George L. Clark X-Ray Facility &

    3M Materials Laboratory University of Illinois at Urbana?Champaign 70 Noyes Laboratory 505 South Mathews Avenue Urbana Illinois 61801 United States;

    Beckman Institute Imaging Technology Group University of Illinois at Urbana?Champaign B604A Beckman Institute 405 North Mathews Urbana Illinois 61801 United States;

    DSC Solutions 27 East Braeburn Drive Smyrna Delaware 19977 United States;

    Department of Food Science and Human Nutrition University of Illinois at Urbana?Champaign 367 Bevier Hall 905 South Goodwin Avenue Urbana Illinois 61801 United States;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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