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The photoreaction which takes place between benz [a] pyrene and DNA by irradiation at 365 nm leads to a covalent combination. To ascertain the reactive sites of DNA, a sample of the macromolecule has been precipitated after irradiation in the presence of benz [a] pyrene and hydrolized; among the products of hydrolysis four different fluorescent substances have been isolated, one of which was identical with the photoadduct benz [a] pyrene-thymine, already prepared by irradiation of the two substances at 365 nm. This photoadduct has been obtained in an amount corresponding to a molecular ratio 1 : 7000 in respect to the nucleotides (P atoms) present in the sample of DNA.

Isolation of a benz[a]pyrene-thymine photoadduct from DNA hydrolized after irradiation at 365 nm in the presence of benz[a]pyrene