通过使用安全且容易获得的手段来检测和去除细菌,例如在水环境中的大肠杆菌是非常重要的。在这里,我们报告了用特定碳水化合物(糖基-ND)共价修饰的纳米金刚石(ND)的合成,以通过机械稳定的凝集作用沉淀溶液中的1型纤维化尿路致病性大肠杆菌。金刚石纳米颗粒的表面通过Diels-Alder反应进行修饰,然后分别进行共糖苷的共价接枝。所得的糖-ND样品可完全分散在水性介质中,并且表面负荷通常为0.1 mmol g -1。为了探测各种ND样品的粘合性能,我们开发了一种新的三明治测定法,该测定法采用了阵列形式的两个细菌菌株层。溶液中的凝集实验用于区分糖-ND与细菌与特定细菌之间的非特异性相互作用。观察到溶液中的两种类型的沉淀物,并通过光学和电子显微镜详细表征。仅通过特定的相互作用,形成了机械稳定的凝集物。通过将这些稳定的凝集物通过10μm孔径的过滤器过滤,可以从水中除去细菌,并最终通过添加适当的碳水化合物来回收ND共轭物。
作者:Harun A. Shaikh、Frank D. Sönnichsen、Thisbe K. Lindhorst
DOI:10.1016/j.carres.2008.04.015
日期:2008.7
A new type of glycoconjugate mimetic is introduced that combines a glycocluster head group with a peptide part. These 'glycocluster peptides' are designed to serve as mimetics of glycocalyx constituents. A convergent synthetic scheme was followed, consisting of (i) the synthesis of a clustered carbohydrate head group carrying an amino acid at the focal point, and (ii) the solid phase synthesis of the
Synthesis and Biological Evaluation of α-<scp>d</scp>-Mannopyranoside-Containing Dendrimers
作者:Peter R. Ashton、Elizabeth F. Hounsell、Narayanaswamy Jayaraman、Torill M. Nilsen、Neil Spencer、J. Fraser Stoddart、Mia Young
DOI:10.1021/jo9804184
日期:1998.5.1
The extension of dendritic synthetic principles to the preparation of new kinds of dendrimer-based glycoconjugate systems has been investigated. A convergent growth approach to the synthesis of alpha-D-mannopyranoside-containing dendrimers of various generations has been used successfully to obtain high molecular weight and monodisperse dendrimers in which 3-36 identical copies of the mannopyranoside residues are located at their peripheries. A repetitive synthetic sequence for forming amide bonds is employed in the preparation of various dendritic wedges and their attachment to a 1,3,5-trisubstituted benzenoid core in the last step. The protecting groups on the saccharide residues are then finally removed to obtain free saccharide-containing dendrimers. The efficacy of these dendrimers in inhibiting the binding of concanavalin A lectin to a purified yeast mannan fraction (as measured by an enzyme-linked lectin assay) is shown to be about four times more pronounced on a molar basis for the dendrimers possessing nine, 18, and 36 mannose residues, when compared to a dendritic wedge possessing three mannose residues and methyl alpha-D-mannopyranoside as control inhibitors.