DNA–Naphthyl Red conjugate as a visualizing probe of DNA hybridization

The Naphthyl Red moiety, conjugated to DNA, shows distinct chromism by hybridization with its complementary DNA. Singlestranded DNA involving the Naphthyl Red moiety exhibits an orange color and has (lambda)max at 466 nm at pH 7.0. The absorption maximum is shifted towards 545 nm by the presence of its complementary DNA, and the color of the solution changes from orange to magenta accordingly.