Colorimetric anion sensing by polyamide models containing urea-binding sites
摘要:
Novel colorimetric polyamide model compounds for anion-sensing applications are described. Light beige solutions of one of the models (M3) in DMSO develop a red to yellow-reddish colour upon addition of some anions, including OH-, F-, HC[image omitted], P[image omitted], AcO-, benzoate-, oxalate2- and p-toluenesulphonate-. In contrast, they remain unchanged in the presence of CH2ClC[image omitted], H2P[image omitted], CF3CO2-, Br-, methanesulphonate-, Cl- or I-. The reddish colour caused by the addition of basic anions is due to the deprotonation of the urea groups, while the yellowish colour corresponds to the modification of the electron density surrounding the urea group due to complexation. The development of the yellow colour of DMSO solutions of M3 upon addition of acetate ions and the disappearance of the red colour of solutions of M3/fluoride by the displacement of acetate ions can serve as a novel colorimetric assay for the titration of the acetate anion, with detection limits close to 1ppb. The host:guest stoichiometry (polyamide model compound:anion complexes) and the stability constants of complexes were determined by 1H NMR.
pH-Tunable Hydrogelators for Water Purification: Structural Optimisation and Evaluation
作者:Daniel M. Wood、Barnaby W. Greenland、Aaron L. Acton、Francisco Rodríguez-Llansola、Claire A. Murray、Christine J. Cardin、Juan F. Miravet、Beatriu Escuder、Ian W. Hamley、Wayne Hayes
DOI:10.1002/chem.201102137
日期:2012.2.27
A focused library of potential hydrogelators each containing two substituted aromatic residues separated by a urea or thiourea linkage have been synthesised and characterized. Six of these novel compounds are highly efficient hydrogelators, forming gels in aqueous solution at low concentrations (0.03–0.60 wt %). Gels were formed through a pH switching methodology, by acidification of a basic solution
Selective and highly efficient dye scavenging by a pH-responsive molecular hydrogelator
作者:Francisco Rodríguez-Llansola、Beatriu Escuder、Juan F. Miravet、Daniel Hermida-Merino、Ian. W. Hamley、Christine J. Cardin、Wayne Hayes
DOI:10.1039/c0cc02338h
日期:——
A structurally simple low molecular weight hydrogelator derived from isophthalic acid forms robust pH-responsive hydrogels capable of highly efficient and selective dye adsorption.
Catalytic antibodies for carbamate activation by a non-spontaneous
申请人:Zeneca Limited
公开号:US05807688A1
公开(公告)日:1998-09-15
Catalytic antibodies capable of catalysing activation of a carbamate (--O--CO--NH--) containing prodrug suitable for Antibody Directed Abzyme Prodrug Therapy (ADAPT) by catalysing breakdown of the prodrug at the carbamate position by a non-spontaneous reaction mechanism. The non-spontaneous reaction preferably has a B.sub.Ac 2 mechanism and the prodrug is a preferably a nitrogen mustard aryl carbamate. The invention also includes relevant immunogens, screens for catalytic activity using short transition state analogues and ADAPT systems.
Catalytic antibodies capable of catalysing activation of a carbamate (-O-CO-NH-) containing prodrug suitable for Antibody Directed Abzyme Prodrug Therapy (ADAPT) by catalysing breakdown of the prodrug at the carbamate position by a non-spontaneous reaction mechanism. The non-spontaneous reaction preferably has a BAc2 mechanism and the prodrug is a preferably a nitrogen mustard aryl carbamate. The invention also includes relevant immunogens, screens for catalytic activity using short transition state analogues and ADAPT systems.