马铃薯淀粉汁水经分离与纯化后得到马铃薯糖蛋白Patatin。通过对Patatin纯度、结构的测定与分析表明:Patatin纯度在90%以上,分子量为40.6 k Da。Patatin是糖和蛋白质的复合物。单糖组成为:鼠李糖、甘露糖、葡萄糖和半乳糖。Patatin中含...马铃薯淀粉汁水经分离与纯化后得到马铃薯糖蛋白Patatin。通过对Patatin纯度、结构的测定与分析表明:Patatin纯度在90%以上,分子量为40.6 k Da。Patatin是糖和蛋白质的复合物。单糖组成为:鼠李糖、甘露糖、葡萄糖和半乳糖。Patatin中含有α-糖苷键,糖苷类型为吡喃型;糖链和肽链之间由O-型糖肽键连接。Patatin的热变性温度为75℃。展开更多
研究了新型树脂NKY对7种水溶性染料的静态吸附特性。结果表明,该树脂对水溶性染料的吸附具有特效性。通过三常数方程非线性回归实验数据可求出吸附过程的 A G’,说明 NKY对染料的第一层吸附为物理和化学作用并存的过程,多层吸附为典型...研究了新型树脂NKY对7种水溶性染料的静态吸附特性。结果表明,该树脂对水溶性染料的吸附具有特效性。通过三常数方程非线性回归实验数据可求出吸附过程的 A G’,说明 NKY对染料的第一层吸附为物理和化学作用并存的过程,多层吸附为典型的物理吸附。由分配比和温度关系曲线可求得j什,推导出的标准自由摘为正值,说明吸附是自发进行的。展开更多
Carboxymethyl starchs（CMS） with low and high degrees of substitution（CMSL and CMSH in short,respectively） were employed as depressants of diaspore in cationic reverse flotation using dodecylamine（DDA） as collect...Carboxymethyl starchs（CMS） with low and high degrees of substitution（CMSL and CMSH in short,respectively） were employed as depressants of diaspore in cationic reverse flotation using dodecylamine（DDA） as collector.The effect of degree of substitution of CMS on its depression performance was examined and the interaction mode and behavior were investigated in a comparative manner.Micro-flotation test showed that CMSL exhibited better performance in depressing diaspore than CMSH in a broad pH range.The adsorption of CMS on diaspore was studied by adsorption test,zeta potential measurement,and atomic force microscopy.It was found that CMSH corresponds to lower adsorption amount,thinner adsorption layer,and more negative charge than CMSL,resulting from the more chelating sites brought by the high degree of substitution.The surface tension measurement and DDA adsorption test further revealed that CMSL/DDA system gives a better depressing performance benefiting from the trapping effect by enveloping some DDA molecules inside the loop chains,while CMSH/DDA system is likely considered a quasi-surfactant.展开更多
文摘马铃薯淀粉汁水经分离与纯化后得到马铃薯糖蛋白Patatin。通过对Patatin纯度、结构的测定与分析表明:Patatin纯度在90%以上,分子量为40.6 k Da。Patatin是糖和蛋白质的复合物。单糖组成为:鼠李糖、甘露糖、葡萄糖和半乳糖。Patatin中含有α-糖苷键,糖苷类型为吡喃型;糖链和肽链之间由O-型糖肽键连接。Patatin的热变性温度为75℃。
文摘研究了新型树脂NKY对7种水溶性染料的静态吸附特性。结果表明,该树脂对水溶性染料的吸附具有特效性。通过三常数方程非线性回归实验数据可求出吸附过程的 A G’,说明 NKY对染料的第一层吸附为物理和化学作用并存的过程,多层吸附为典型的物理吸附。由分配比和温度关系曲线可求得j什,推导出的标准自由摘为正值,说明吸附是自发进行的。
基金Projects (50804055,50974134) supported by the National Natural Science Foundation of ChinaProject (09JJ3100) supported by the Natural Science Foundation of Hunan Province,China
文摘Carboxymethyl starchs（CMS） with low and high degrees of substitution（CMSL and CMSH in short,respectively） were employed as depressants of diaspore in cationic reverse flotation using dodecylamine（DDA） as collector.The effect of degree of substitution of CMS on its depression performance was examined and the interaction mode and behavior were investigated in a comparative manner.Micro-flotation test showed that CMSL exhibited better performance in depressing diaspore than CMSH in a broad pH range.The adsorption of CMS on diaspore was studied by adsorption test,zeta potential measurement,and atomic force microscopy.It was found that CMSH corresponds to lower adsorption amount,thinner adsorption layer,and more negative charge than CMSL,resulting from the more chelating sites brought by the high degree of substitution.The surface tension measurement and DDA adsorption test further revealed that CMSL/DDA system gives a better depressing performance benefiting from the trapping effect by enveloping some DDA molecules inside the loop chains,while CMSH/DDA system is likely considered a quasi-surfactant.
