Rapid fluorescence assay for Sudan dyes using ...
Mar 02, 2014 · We report that the intensity of the blue fluorescence of copper nanoclusters coated with polyethyleneimine (PEI) is strongly reduced in the presence of the food dyestuffs Sudan IIV. This finding was exploited in a labelfree fluorescence assay for these Sudan dyes both in ethanol and aqueous solutions. The PEIcapped nanoclusters have an average diameter of nm .