Zeolite LTA has been largely used as good adsorbent and detergent builder with a huge amount of demand Numerous efforts have been devoted to the exploration of new synthetic methods for preparing zeolites more conve- ...Zeolite LTA has been largely used as good adsorbent and detergent builder with a huge amount of demand Numerous efforts have been devoted to the exploration of new synthetic methods for preparing zeolites more conve- niently and efficiently. Herein, we reported a wet-gel crystallization route to synthesize zeolite LTA from simple filtration of the initial reaction mixture followed by heating for crystallization. The products were characterized in detail by means of X-ray diffraction, Raman spectra, scanning electron microscopy and elemental analysis. The yields of the solid products were also investigated, which suggested that the wet-gel method afforded an obvious improve- ment of products yield compared with the conventional synthesis route. For application as detergent builder, the cal- cium ion exchange rates of the wet-gel synthesized zeolites were similar with that of conventional LTA zeolites. Therefore the wet-gel route would be potentially important in industry due to its advantages of easy-performing, high-yielding and energy-saving.展开更多
以蛋清蛋白(Egg White Protein,EWP)为主要原料,研究低聚半乳糖(Galactooligosaccharides,GOS)改性对蛋清蛋白凝胶性能的影响,并探讨其凝胶机理。首先研究了GOS添加量及热诱导条件对复合凝胶硬度和弹性的影响,然后通过低场核磁、流变仪...以蛋清蛋白(Egg White Protein,EWP)为主要原料,研究低聚半乳糖(Galactooligosaccharides,GOS)改性对蛋清蛋白凝胶性能的影响,并探讨其凝胶机理。首先研究了GOS添加量及热诱导条件对复合凝胶硬度和弹性的影响,然后通过低场核磁、流变仪、傅里叶红外光谱、扫描电镜等手段对复合凝胶的色差、保水性、流变特性、分子间作用力及微观结构进行分析,探究糖基化改性提高EWP凝胶特性机理。结果表明,GOS添加量及热诱导条件能够显著(P<0.05)影响复合凝胶的质构特性,与EWP凝胶相比,在最佳条件下制得的复合凝胶硬度和弹性分别增加68.30%和15.05%,白度下降23.37%,保水性增加27.54%。EWP经糖基化改性后,疏水相互作用及二硫键贡献增强,GOS碳氧双键与EWP伯氨基发生共价交联,使凝胶的微观结构更加致密、保水性更强。本研究为蛋清蛋白湿法糖基化改性的制备及应用提供理论基础。展开更多
基金Supported by the National Natural Science Foundation of China（Nos.21403193, 51503148） and the Natural Science Foundation of Tianjin City, China（Nos. 14JCQNJC02500, 15JCQNJC09000）.
文摘Zeolite LTA has been largely used as good adsorbent and detergent builder with a huge amount of demand Numerous efforts have been devoted to the exploration of new synthetic methods for preparing zeolites more conve- niently and efficiently. Herein, we reported a wet-gel crystallization route to synthesize zeolite LTA from simple filtration of the initial reaction mixture followed by heating for crystallization. The products were characterized in detail by means of X-ray diffraction, Raman spectra, scanning electron microscopy and elemental analysis. The yields of the solid products were also investigated, which suggested that the wet-gel method afforded an obvious improve- ment of products yield compared with the conventional synthesis route. For application as detergent builder, the cal- cium ion exchange rates of the wet-gel synthesized zeolites were similar with that of conventional LTA zeolites. Therefore the wet-gel route would be potentially important in industry due to its advantages of easy-performing, high-yielding and energy-saving.
文摘以蛋清蛋白(Egg White Protein,EWP)为主要原料,研究低聚半乳糖(Galactooligosaccharides,GOS)改性对蛋清蛋白凝胶性能的影响,并探讨其凝胶机理。首先研究了GOS添加量及热诱导条件对复合凝胶硬度和弹性的影响,然后通过低场核磁、流变仪、傅里叶红外光谱、扫描电镜等手段对复合凝胶的色差、保水性、流变特性、分子间作用力及微观结构进行分析,探究糖基化改性提高EWP凝胶特性机理。结果表明,GOS添加量及热诱导条件能够显著(P<0.05)影响复合凝胶的质构特性,与EWP凝胶相比,在最佳条件下制得的复合凝胶硬度和弹性分别增加68.30%和15.05%,白度下降23.37%,保水性增加27.54%。EWP经糖基化改性后,疏水相互作用及二硫键贡献增强,GOS碳氧双键与EWP伯氨基发生共价交联,使凝胶的微观结构更加致密、保水性更强。本研究为蛋清蛋白湿法糖基化改性的制备及应用提供理论基础。
