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亲水作用色谱(HILIC)材料在糖肽的富集与分离中得到越来越广泛的应用. 针对目前HILIC材料糖肽选择性不足的缺点, 发展新的糖肽富集方法十分必要. 本工作发展了一种商品化的弱阳离子交换材料(WCX)在亲水模式下对糖肽的富集方法. 首先考察了微固相萃取(SPE)模式下WCX上多肽保留的机理. 结果显示, WCX上糖肽的保留同时受乙腈含量和pH的影响. 将WCX用于牛胎球蛋白(fetuin)胰蛋白酶酶解液中糖肽的富集, 获得了39条糖肽信号. 当fetuin与牛血清白蛋白(BSA)酶解液以物质的量比1:5混合时, 富集到26条糖肽信号. 富集人免疫球蛋白(IgG)胰蛋白酶酶解液时获得25条糖肽信号, 1:5时获得23条糖肽信号. 实验说明WCX对唾液酸化和非唾液酸化糖肽的富集均有高选择性. 该方法拓展了WCX的应用范围, 丰富了HILIC材料的种类.  相似文献   

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The rigid Schiff‐base ligand cis,trans‐1,3,5‐tris(pyridine‐2‐carboxaldimino) cyclohexane is synthesized, and its complexation to copper(II) salts at a range of stoichiometries is investigated. L. Cronin et al. show that the complexation reaction leads to the crystallization of transition‐metal complexes with nuclearities of 1, 2, and 4, and the formation of the complexes can be followed stepwise, in real time, using electrospray mass spectrometry. For more information, see their Full Paper on page 681 ff.

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Electroosmotic‐flow‐driven droplet generation integrated with capillary electrophoresis (CE) allows the molecular components separated by CE to be compartmentalized into a stream of droplets, as reported by D. T. Chiu and co‐workers in their Communication on page 2719 ff. and illustrated on the cover picture. After separation and droplet compartmentalization, the droplet‐confined bands either can be docked and studied on‐chip or removed off‐chip for a second‐dimension separation and further analysis.

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Density functional theory and fragment‐energy analysis have been used to probe the mechanism of the halogen–zinc exchange reaction. In their Full Paper on page 5686 ff. , M. Uchiyama, S. Nakamura et al. discuss three important factors in this reaction: The effect of the halogen species, the effect of the alkyl ligand on zinc, and the effect of the substrate nature.

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