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The carcinogenic hydrocarbon 3.4-benzopyrene is soluble in aqueous solutions of different proteins. The solubilities are easily determined by the fluorimetric method. The fluorescence o. the hydrocarbon in the protein solutions is not quenched by molecular oxygen. Nevertheless only in presence of air (oxygen) an irreversible decrease of the fluorescence intensity occurs under irradiation with UV-light of wavelength 366 mμ, which is considerably faster than under nitrogen or in solutions of the hydrocarbon in ethanol or aqueous caffeine.

zeitschrift für naturforschung b

Modellversuche zur chemischen Carcinogenese und zum photodynamischen Effekt von 3.4-Benzpyren und UV-Licht in wäßrigen Proteinlösungen mit verschiedener SH-Gruppenreaktivität