Acid red 88 is an anionic dye with potentially useful photocatalytic research applications. Acid red 88 has been used to determine the effect of Au deposition on ZnO photocatalytic activity under visible light. Additionally, the photocatalyst Au-TiO2 was
Bromophenol red (BPR) is a chemical indicator. It has been shown to bind to lysozymes and inhibits their activity against bacterial cell walls, but not against the polysaccharide component of peptidoglycan.