Multiwell plates loaded with fluorescent hydrogel sensors for measuring pH and glucose concentration

Abstract

Fluorescent hydrogels were polymerized directly in multi-well plates at ambient temperature and in the presence of air, producing sensors for measuring pH and glucose concentration. The plates were rapidly analyzed using a fluorescence plate reader. Multiwell pH sensors with good reproducibility among different wells and a dynamic range from pH 6 to 9 were prepared by incorporating a polymerizable pH sensitive fluorophore in the hydrogel. Non-enzymatic glucose sensors comprising a boronic acid-appended fluorescence quencher together with an aminopyrene fluorophore were prepared in a matter of hours in multiwell plates. The sensors showed good reproducibility in response to solutions of glucose at physiological pH. Dried glucose sensors rehydrated with analyte solution performed similarly to freshly prepared hydrogels. The loaded plates are designed for use in high throughput screening applications. Plates were prepared using the redox initiator system metabisulfite/persulfate/iron(II) to generate hydrogels of N,N-dimethylacrylamide crosslinked with N,N′-methylenebisacrylamidein situ.