Paper-based luminescence bioassay method embedding a sequence of enzymatic reactions to detect sulfonamide groups

The Journal of Antibiotics
Kazuki UjiieKazumasa Hirata

Abstract

Sulfonamide residue in foodstuffs and the environment is a serious global concern for their contribution to the occurrence of antibiotic-resistant bacteria, especially in developing countries. Here, we describe a novel, simple, and low-cost bioassay for sulfonamides, which has high potential versatility for use in low-resource settings. The bioassay method is based on a purpose-built luminescent assay reaction that detects sulfonamide groups. The luminescent assay reaction comprises dihydropteroate synthase, a target enzyme of sulfonamides, and luminescent pyrophosphate detection reagent, which triggers a sequence of biomolecular reactions that convert sulfonamides to emit luminescence. The novel assay detected at least six different sulfonamides with an estimated limit of detection of <25 ng ml-1 in a solution-phase assay using a microplate reader. More importantly, the luminescent assay reaction functioned even after spotting and freeze-drying on a wax pattern-printed paper platform. The paper-embedded luminescent assay reaction showed response signals to sulfadiazine within 30 min at a limit of detection similar to that of the solution-phase assay using a microplate reader. The signal could be recorded using a digital camera...Continue Reading

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