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A simple and rapid bioassay for cholera toxin (CT) has been developed by using fluorescence resonance energy transfer (FRET) between galactose-stabilized gold nanoparticles (AuNPs) and amine-terminated CdTe quantum dots (QDs). The target CT from the bacterium Vibrio cholerae has five carbohydrate binding sites which selectively bind to the synthesized β-galactose derivative immobilized on AuNPs. The...
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