Technical Report On Toxicology And Carcinogenesis Studies Of A Methylstyrene Cas No 98 83 9 In F344 N Rats And B6c3f1 Mice Inhalation Studies

a-Methylstyrene is used to make heat-resistant acrylonitrile-butadiene-styrene resins & polymers. This report studies the effects of a-methylstyrene on male & female rats & mice to identify potential toxic or cancer-related hazards. It concludes that exposure to a-methylstyrene in the air caused kidney tumors, & possibly mononuclear cell leukemia, in male rats. It concludes that a-methylstyrene caused liver cancer in female mice, & also possibly in male mice. Charts, tables, graphs & plates.

Methylene Blue Trihydrate (MBT) has a variety of biomedical and biologically therapeutic applications. MBT was nominated by the Nat. Cancer Inst. for carcinogenecity testing based on the numerous uses of this compound and the lack of long-term toxicity data, including epidemiological studies of MBT, as well as the inadequate animal data on this compound. Male and female F344/N rats and B6C3F1 mice were administered MBT in 0.5% aqueous methylcellulose by gavage for 1 month, 3 months, or 2 years. Genetic toxicology studies were conducted using ¿Salmonella typhimurium,¿ ¿Escherichia coli,¿ cultured Chinese hamster ovary cells, mouse bone marrow cells, and mouse peripheral blood erythrocytes. Illustrations.

Cumene is produced in a modified Friedel-Crafts reaction process. Cumene is the principal chemical used in the production of phenol and acetone. Cumene is used: as a thinner; as a constituent of some petroleum-based solvents; in gasoline blending, diesel fuel, and high-octane aviation fuel; and as a raw material for peroxides and oxidation catalysts. Because cumene is a good solvent for fats and resins, it has been suggested as a replacement for benzene in many industrial applications. Cumene occurs naturally in petroleum and in a variety of foodstuffs. Cumene was nominated for study because of its high production volume, presence in gasoline and other fuels, potential for human exposure, and lack of existing carcinogenecity test data. Illus.