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为了研究细微化对马铃薯淀粉(MPST)疏水亲脂化特性的影响,本试验以微细化MPST为原料,利用铝酸酯偶联剂(DL)对其进行改性,考察改性后MPST的吸湿性和吸油性。试验结果表明:经DL疏水亲脂化改性之后,MPST分散率明显提高,当MPST的粒度为11.919μm时,改性后静置12 h,在MPST/液体石蜡的分散率仅降低16.6%;随着MPST颗粒粒度的减小,疏水亲脂化MPST/液体石蜡分散体系的稳定性明显提高;疏水亲脂化改性可有效改善MPST的吸湿性,减少MPST的吸油性,随着MPST颗粒粒度的减小,其吸油率逐渐上升,从马铃薯原淀粉的32.9%上升到MPST(d50=11.919μm)77.2%,经疏水亲脂化改性后的马铃薯原淀粉和各MPST(从颗粒粒度由大到小排列)吸油率分别下降了6.6%、16.1%、32.2%、44.7%和59.4%。 相似文献
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为提高淀粉材料的力学性能和耐水性能,以六偏磷酸钠为交联剂,有机硅烷偶联剂KH-570为疏水化改性剂,通过正交试验和四因素二次旋转正交组合试验设计,对玉米淀粉交联疏水化双改性工艺参数进行优化。结果表明:淀粉交联改性的最佳工艺参数为pH值11,六偏磷酸钠的用量1.5%,温度40℃,时间2h;淀粉疏水偶联化改性最佳工艺参数为乙醇浓度95.70%,KH-570用量1.68%(占淀粉干基),稀释度2.81%,反应时间29.61min。改性淀粉吸水率最小为16.23%。 相似文献
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本文研究了不同添加量的辛烯基琥珀酸酐(OSA)、Al3+以及不同p H值在改性过程中对玉米淀粉、木薯淀粉和马铃薯淀粉休止角、活化指数、接触角、分散性、和偏光特性的影响。实验表明,随着OSA、Al3+添加量和交联过程中p H值的增加,玉米淀粉和木薯淀粉的休止角呈现出先减少后增加的特征,而只有p H值的变化对马铃薯淀粉的休止角产生了比较明显的影响;改性后,三中淀粉的接触角均大于90°,证明淀粉疏水性得到显著提高;同时,在活化指数试验中,木薯淀粉和马铃薯淀粉的活化指数可以达到0.95;液体石蜡中的分散性测试表明,玉米淀粉的分散性最好,其次是木薯淀粉,马铃薯淀粉的分散性最差,而改性后淀粉的分散性较原淀粉并未出现明显变化;最后,通过观察同等光强条件下淀粉的偏光特性,发现改性后淀粉颗粒出现偏光十字变弱、表面阴影增加的情况。 相似文献
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Li-Ming Che Li-Jun Wang Xiao Dong Chen Zhi-Huai Mao 《International Journal of Food Properties》2013,16(3):527-536
In this study, the cassava starch was micronized in a vacuum ball-mill to make tiny granules of different particle sizes (the d 50 value from 7.9 μm to 24.0 μm). The properties of the micronized cassava starch, such as granularity, gelatinization properties, and dispersibility in organic solvent, have been evaluated. Then the micronized cassava starch has also been modified using a dry-method to improve its hydrophobic property, with aluminate coupling agent (ACA). The results suggest that the granularity of the starch decreases sharply through micronization in the vacuum ball-mill. The d 50 value of micronized starch was reduced from 24.0 μm to 7.9 μm with the milling time from 0 h to 54 h. The active sites increase as the size of the cassava starch is reduced. The micronized starch has been found to be more easily gelatinized, dispersed in organic solvent and modified. The gelatinization temperature of starch was reduced from 59°?C to 23°?C with the milling time from 0 to 54 h. 相似文献
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以天然玉米淀粉为参照,研究了物理法粉碎的不同粒度微细化淀粉的含水量,吸湿性,水吸附能力以及表观密度,结果表明,微细化淀粉的含水量随粒度降低而下降,存放初期吸湿性强,至后期吸湿性与天然玉米淀粉趋于一致。微细化淀粉表观密度下降,并呈现出很强的水吸附能力。 相似文献
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本文用碱提法从藜麦种子中提取藜麦淀粉,并用辛烯基琥珀酸酐(Octenyl Succnic Anhydride,OSA)对提取的藜麦淀粉进行疏水改性,得到了辛烯基琥珀酸淀粉酯(OSA淀粉)。通过傅里叶红外光谱、扫描电子显微镜对比原淀粉和OSA淀粉颗粒的结构和形态,发现OSA基团成功接到淀粉表面,在形态上表现为颗粒表面轻度破坏。通过测定乳液微观结构,乳滴粒径及乳化指数(EI),分析了OSA淀粉取代度、颗粒浓度和油相比例等因素对Pickering乳液乳化性的影响。结果表明,乳滴粒径随OSA淀粉取代度或淀粉颗粒浓度的增加而减小、EI值随OSA淀粉取代度或淀粉颗粒浓度的增加而提高,乳液乳化性增强。当油相比例的增加时,乳滴粒径增大,且在食品添加剂允许OSA添加量的范围内,取代度为1.43%的OSA淀粉颗粒的EI值达到最大值75.48%,乳化性最好。研究表明OSA改性藜麦淀粉作为Pickering乳液的稳定颗粒在食品领域有极大的应用潜力。 相似文献
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A new particle design method was proposed for the production of hydrophobic corn starch with high flowability by surface modification. The flowability and hydrophobicity of the native and modified corn starches were investigated by wettability (activation index) and flowability experiments (flow time), scanning electron microscopy (SEM), and X‐ray diffraction (XRD). In corn starch modification, the optimal modifying agent is a mixture of tetraisopropyldi(dioctylphosphate)titanate (NDZ‐401) and methyl hydrogen silicone oil (H202), and the optimal content is 1% (w/w). The optimal content of flow agent (R972 silica) is 1% (w/w). The results indicate that the modified corn starch is a free flowing powder, which is also remarkably water repellent. The crystalline structures of the native and modified corn starches are similar, and only the surface properties are changed from hydrophilic to hydrophobic. 相似文献