Abstract
Lipid peroxide concentration in dog foods A, B, C and D available on the market was determined using 2-thiobarbituric acid (TBA). The mean concentrations were 29.2, 6.1, 9.8 and 3.1 nmol/g in dog foods A, B, C and D, respectively. These dog foods were then kept in a refrigerator (4°C) or a darkroom, and exposed to a fluorescent light or the sun, and changes in the lipid peroxide concentration were examined in each of the dog foods for 30 days. The concentrations in dog foods exposed to a original light and the sun increased to 350-630% and 700-2100% of the original value, respectively, after 30 days. The dog foods kept in a refrigerator or a darkroom, however, showed only a slight increase in concentration. To inhibit the increase in lipid peroxide concentration, it seems desirable to keep dog foods in a refrigerator or a darkroom.
