Chiral interaction of a polyclonal anti-dinitrophenyl antibody with dinitrophenyl-amino acids determined by an enantioselective enzyme-linked immunosorbent assay

Chiral separation of T3 enantiomers using stereoselective antibodies as a selector in micro-HPLC

This work deals with the application of stereoselective antibodies against L-T3 as a tailor-made chiral selector in micro-HPLC. The separations were performed in microbore columns using commercially available anti-L-T3 antibodies chemically bonded to 5 microm silica gel. The enantiomers of T3 were baseline separated under mild continuous isocratic elution conditions using 10 mM phosphate buffer, pH 7.4. The D-enantiomer eluted with the void volume, while the L-enantiomer was retained by the antibody phase and eluted second. An indirect competitive and non-competitive enzyme linked immunosorbent assay (ELISA) was used for testing the stereoselectivity of anti-L-T3 antibodies.

A chiral sensor for arginine and lysine

[structure: see text] We provide access to a new class of C1- or C2-symmetrical host molecules 1 and 2 based on a spirobisindane skeleton. Whereas 1 is selective for short, rigid diamines, 2 prefers longer alpha,omega-dications. Of all the amino acid methyl esters, only those of lysine and arginine with the correct distance between their cationic groups form strong 1:1 complexes in DMSO with 2. NMR titrations reveal high association constants as well as discrimination between the enantiomers of lysine and arginine.

Direct binding of low molecular weight haptens to ELISA plates

Immobilization of low molecular weight haptens in ELISA usually involves their coupling to protein molecules or covalent binding to the solid phase. In this study we demonstrate that it is possible to directly bind the hapten p-aminophenylalanine to gamma-irradiated polystyrene microtiter plates for the detection of antibodies that stereospecifically recognize the chiral center of alpha-amino acids. Simple incubation of the hapten in aqueous buffer, without additional activation, results in a stable coating that is suited for use in ELISA.