Artificial receptors for the extraction of nucleoside metabolite 7-METHYLGUANOSINE (cas 15313-37-8) from aqueous media made by molecular imprinting

Add time:08/07/2019    Source:sciencedirect.com

A series of imprinted polymers targeting nucleoside metabolites, prepared using a template analogue approach, are presented. These were prepared following selection of the optimum functional monomer by solution association studies using 1H NMR titrations whereby methacrylic acid was shown to be the strongest receptor with and affinity constant of 621 ± 51 L mol−1 vs. 110 ± 16 L mol−1 for acrylamide. The best performing polymers were prepared using methanol as porogenic co-solvent and although average binding site affinities were marginally reduced, 2.3 × 104 L mol−1 vs. 2.7 × 104 L mol−1 measured for a polymer prepared in acetonitrile, these polymers contained the highest number of binding sites, 5.27 μmol g−1 vs. 1.64 μmol g−1, while they also exhibited enhanced selectivity for methylated guanosine derivatives. When applied as sorbents in the extraction of nucleoside derivative cancer biomarkers from synthetic urine samples, significant sample clean-up and recoveries of up to 90% for 7-METHYLGUANOSINE (cas 15313-37-8) were achieved.

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