title: Polymer-bound reagents for the introduction of spacer-modified biotin labels.
abstract: We have developed a method for the chemoselective introduction of spacer modified biotin labels into unprotected multi-functional amines. A range of novel biotin spacer conjugates attached to a polymer-bound sulfonamide anchor was prepared using established amide bond forming procedures. After chemical transformation of the attachment site by alkylation, the resulting reactive species were utilized as N-selective polymer-supported biotinylation reagents. The labeled compounds, obtained in good to excellent yield and purity, are free of residual biotin and possess a custom tailored distance from the immobilization site being especially suited for the immobilization on streptavidin-functionalized dextran layers of surface plasmon resonance detector chips. In addition, derivatives displaying a phenyl group were synthesized in order to demonstrate the versatility of the procedure for the simultaneous introduction of spacer-modified biotin and a UV-light absorbing moiety. The formation of biotin sulfoxides in the presence of in situ generated peroxides was investigated and is discussed. Our results suggest that this derivatization technique is a useful addition to the existing biotin labeling protocols.
authors.affiliation: Faculty of Chemistry, University of Hamburg, Bundesstrasse 45, D-20146 Hamburg, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Herforth
authors.forename: Philipp
authors.initials: P
authors.lastname: Heidler
authors.forename: Stephan
authors.initials: S
authors.lastname: Franke
authors.forename: Andreas
authors.initials: A
authors.lastname: Link
mesh_terms: D000588:Amines / Q000737:chemistry; D001710:Biotin / Q000031:analogs & derivatives / Q000138:chemical synthesis / Q000378:metabolism; D019921:Biotinylation / Q000379:methods*; D007202:Indicators and Reagents; D011108:Polymers / Q000737:chemistry; D013454:Sulfoxides / Q000737:chemistry* / Q000378:metabolism; D020349:Surface Plasmon Resonance / Q000379:methods
chemical_list: D000588:Amines; D007202:Indicators and Reagents; D011108:Polymers; D013454:Sulfoxides; D001710:Biotin