2022-03-122022-03-1220051476-4865https://hdl.handle.net/11424/228120The printability of 4'-chlorophenylazo-2-naphthol (CPAN) was evaluated on gloss-coated paper. The preliminary results indicated that the proposed pigment could be used in offset and oil-based ink production. The pigment and its potential reduction product, 4-chloroaniline, were then separated by a reverse phase high-pressure liquid chromatography system. The pigment was incubated with NADH at 37 degrees C for half an hour at different pH values to investigate its possible reduction into the corresponding primary amines (ie 4-chloroaniline and 2-amino-1-naphthol). However, no reduction was observed. This finding indicates a desirable evidence for the pigment in terms of its stability against NADH (nicotinamide adenine dinucleotide), a known biochemical reducing agent in living organisms when the potential toxicity from aromatic primary amines is considered.enginfo:eu-repo/semantics/closedAccessazo dyesprinting pigments and dyesazo reductionPERFORMANCE LIQUID-CHROMATOGRAPHYAZO DYESPRODUCTSarticleWOS:00023231060000510.1007/BF02699571