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淀粉分子结构对形成抗性淀粉的影响 总被引:10,自引:0,他引:10
考察了几种大米淀粉和土豆淀粉形成抗生淀粉的能力,用分子排阻色谱的方法研究其分子结构。认为土豆淀粉比大米淀粉更适用来生产抗性淀粉。 相似文献
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压热处理对抗性淀粉形成的影响 总被引:27,自引:4,他引:23
以普通玉米淀粉为试验材料,分析对压热温度、压热时间和水分含量进行了研究,采用改进的Berry法定量测定抗性淀粉,分别得到了三条相应的曲线,试验结果证明这三个因素对抗性淀粉的产率有显著的影响,并且发现用压热反应器制备抗性淀粉的合适条件是:70%水份、150℃维持60min,在这个条件下,可以得到较市制 抗性淀粉含量。 相似文献
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不同热处理方式下抗性淀粉形成机理研究 总被引:1,自引:0,他引:1
不同热处理方式对抗性淀粉的形成和淀粉的颗粒及结晶性质有较大影响。其中湿热处理前后淀粉的颗粒形貌变化较小。但淀粉的结晶结构发生一定程度的变化,表现为特征峰的部分融合、峰强度的下降以及结晶度的降低。其中马铃薯淀粉基本呈非晶状态。压热处理后淀粉,颗粒形貌已经完全发生了变化,颗粒破裂重组,不同淀粉颗粒中的链淀粉相互形成氢键,从而改变了原淀粉的结晶结构,从X射线衍射图谱我们可以看出,处理后淀粉有新结晶峰的形成。在过量水分条件下的压热处理有利于抗性淀粉的形成。 相似文献
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温度对抗性淀粉形成的影响 总被引:9,自引:0,他引:9
研究了不同的储存温度下淀粉糊中抗性淀粉的含量。发现抗性淀粉的形成符合晶体的结晶理论,即在低温下成核速率最快,而在较高温度下晶体的成长速率最快,进一步研究了切变温度对抗性淀粉形成的影响。证实低温下淀粉糊中凝胶的形成阻碍了直链淀粉的进一步结晶,而121℃的压热处理可以破坏该凝胶结构。 相似文献
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脂对颗粒态抗性淀粉形成的影响 总被引:4,自引:2,他引:2
抗性淀粉是一种极具重要功能性的食品添加剂。颗粒态抗性淀粉具有不同于传统抗性淀粉的性质,对其研究具有重要意义。本文研究了脱脂、添加单硬脂酸甘油酯和蔗糖脂肪酸酯对抗性淀粉形成的影响。 相似文献
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玉米抗性淀粉制备新工艺的研究 总被引:1,自引:0,他引:1
以高直链玉米淀粉为原料,采用121℃、20 min压热-4℃、24 h冷却的循环和酸解处理相结合的方法制备抗性淀粉,对压热-冷却循环次数和酸种类、酸浓度及作用时间进行了初步研究.结果表明,以上4个因素均对粗抗性淀粉的产量有显著影响.采用此法制备抗性淀粉的适宜条件为压热-冷却循环2次后,加入柠檬酸至0.1 mol/L,室温下作用12 h,抗性淀粉的得率可达到39%.酸处理对高直链玉米淀粉制备抗性淀粉的作用效果显著. 相似文献
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Wenwei Zhang Jingcui Bi Xiaoyan Yan Hailian Wang Changlan Zhu Jiankang Wang Jianmin Wan 《Food chemistry》2007,105(2):462-468
Resistant starch (RS) content was determined in 10 indica and japonica milled rices with different levels of amylose. The effect of microbial growth during starch digestion on the measurement of RS, and the correlation between physico-chemical characteristics and RS contents of milled rice were analysed. Results indicated a significant decrease (P < 0.01) in assay values of RS after antibiotics addition, and the markedly decreased sample pH due to fermentation might be the main reason for errors in RS determination. Correlation analyses showed that RS contents of milled rice were closely related to amylose content (r = 0.75, P < 0.05) and protein content (r = 0.78, P < 0.01). No significant correlation existed between RS content and some relatively simple physical properties, such as width, shape and elongation ratio of rice grain, which were reported to be good indictors of rate of rice starch digestion, while a significant positive correlation was found between elongation ratio and digestible starch in cooked milled rice (r = 0.67, P < 0.05). 相似文献
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《Food research international (Ottawa, Ont.)》2007,40(2):304-310
Debranching and autoclaving processes of banana starch were carried out for obtaining a resistant starch-rich powder with functional characteristics. Debranching was carried out using pullulanase for 24 h and the autoclaving was done at 121 °C for 30 min, the samples were then cooled down and stored between 24 and 48 h, and temperatures between 4 and 60 °C. The resistant starch level increased due to the debranching and autoclaving processes. The water absorption index values decreased when the storage time increased, pattern that agrees with the higher RS content. The water solubility index (WSI) was affected by the storage temperature but not by the storage time. The autoclaved sample was hydrolyzed to a lesser extent than native starch. The RS-rich powder presented also crystallinity because the process of autoclaving and storage induced starch retrogradation. The procedure proposed might be used for production of a RS-rich powder from banana starch with high RS level and functional properties. 相似文献