Pasting properties of a heat-moisture treated canna starch in relation to its structural characteristics
Pasting properties of a heat-moisture treated canna starch in relation to its structural characteristics
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DOI：
10.1016/j.carbpol.2008.08.018
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发表时间：
2009-02-11
影响因子：
11.2
通讯作者：
Uttapap, Dudsadee
中科院分区：
文献类型：
--
作者：
Watcharatewinkul, Yanika;Puttanlek, Chureerat;Uttapap, Dudsadee
将天然和润湿的美人蕉淀粉（水分含量为15%、18%、20%、22%和25%）在100 ℃下热处理16小时。湿热处理（HMT）不改变淀粉颗粒的形状或大小。与未处理的天然淀粉相比，热处理的淀粉显示出较低的糊粘度、更稳定的糊（没有破裂）和明显的消减值降低。当淀粉样品含有更多的水分时，这些变化更明显。通过I-2染色研究的淀粉凝胶形态显示，未处理的天然美人蕉淀粉的颗粒完全破裂，而HMT 22%和HMT 25%样品的颗粒保持颗粒形式。这些凝胶形态的相关性，并提供信息来解释处理和未处理的美人蕉淀粉的糊化行为。HMT后，发现糊化吸热峰随着淀粉样品中水分含量的增加而向更高的温度（1-8 ℃）移动。直链淀粉的浸出处理后的样品往往是较低的样品的水分含量增加。HMT没有改变美人蕉淀粉的结晶类型（B型），但是随着水分的增加，观察到在5.7度处的峰的轻微降低以及在22度和24度处的双峰的融合。(C)2008爱思唯尔有限公司版权所有。
Native and moistened canna starches (moisture contents of 15%, 18%, 20%, 22%, and 25%) were heat treated at 100 degrees C for 16 h. Heat-moisture treatment (HMT) did not alter the shape or size of starch granules. Heat-treated starches showed lower paste viscosity, more stable paste (with no breakdown) and noticeable decrease in setback value compared to untreated native starch. These changes were more obvious when the starch samples contained more moisture. Starch gel morphology investigated by I-2 staining revealed that the granules of untreated native canna starch were completely ruptured, whereas those of HMT22% and HMT25% samples remained in granular form. These gel morphologies were correlated and provided the information to explain the pasting behaviors of treated and untreated canna starches. Shifts of gelatinization endotherms towards higher temperatures (1-8 degrees C) with broadened peaks following the moisture contents in starch samples were found after HMT. Amylose leaching of treated samples tended to be lower when the moisture content of the samples increased. HMT did not alter crystalline type of canna starch (B-type), but with increase of the moisture, slight reduction of a peak at 5.7 degrees and a fusion of doublet at 22 degrees and 24 degrees were observed. (C) 2008 Elsevier Ltd. All rights reserved.