AbstractTriforine is sensitive to u.v. and sunlight. The photochemical inactivation rate was higher in aqueous solution than in the solid state. In aqueous solution 50 of triforine was inactivated after 3 h irradiation with u.v. light and after 30 h exposure to sunlight. Eighty hours were necessary to decompose 25 of triforine in the solid state with sunlight on glass. The half life of triforine residues on the leaves of bean plants was about 60 h when exposed to solar irradiation. The inactivation of triforine by u.v. light and sunlight was accelerated in the presence of the sensitising chemicals riboflavin and xanthene; however, rhodamine B (C.I. 45170) showed only a small photosensitising activity.
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