title: Squaraines as fluoro-chromogenic probes for thiol-containing compounds and their application to the detection of biorelevant thiols.
abstract: A highly selective colorimetric chemodosimeter for thiol-containing compounds in aqueous solutions is reported. The design protocol makes use of a highly specific reaction between thiols and the electrophilic four-membered ring of highly colored, fluorescent squaraine backbones. At neutral pH selective decoloration and total emission quenching was found due to the rupture of the highly delocalized squaraine framework upon selective nucleophilic addition of thiol-containing derivatives. The squaraine derivatives have been successfully applied to the determination of low-molecular mass aminothiols in human plasma. The method utters the high potential applicability of the chemodosimeter approach in the search for new or improved chromogenic selective or specific probes for target guests.
authors.affiliation: GDDS, Departamento de Química, Universidad Politécnica de Valencia, Camino de Vera s/n, E-46071 Valencia, Spain.
authors.forename: Jose V
authors.initials: JV
authors.lastname: Ros-Lis
authors.forename: Beatriz
authors.initials: B
authors.lastname: García
authors.forename: Diego
authors.initials: D
authors.lastname: Jiménez
authors.forename: Ramón
authors.initials: R
authors.lastname: Martínez-Máñez
authors.forename: Félix
authors.initials: F
authors.lastname: Sancenón
authors.forename: Juan
authors.initials: J
authors.lastname: Soto
authors.forename: Fernando
authors.initials: F
authors.lastname: Gonzalvo
authors.forename: M Carmen
authors.initials: MC
authors.lastname: Valldecabres
mesh_terms: D000818:Animals; D001713:Biphenyl Compounds / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D003503:Cyclobutanes / Q000737:chemistry*; D003545:Cysteine / Q000097:blood*; D004151:Dipeptides / Q000097:blood; D005456:Fluorescent Dyes / Q000737:chemistry*; D005978:Glutathione / Q000097:blood; D010636:Phenols / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013438:Sulfhydryl Compounds / Q000032:analysis* / Q000097:blood / Q000737:chemistry
chemical_list: D001713:Biphenyl Compounds; D003503:Cyclobutanes; D004151:Dipeptides; D005456:Fluorescent Dyes; D010636:Phenols; D013438:Sulfhydryl Compounds; C480596:squaraine; C488130:squaraine L1; C488131:squaraine L2; C028505:cysteinylglycine; D005978:Glutathione; D003545:Cysteine