T. Kurechi, A. Kunugi
1983
Citations
0
Influential Citations
15
Citations
Journal
Journal of the American Oil Chemists’ Society
Abstract
The effects of antioxidants were studied with a veiw to pursuing the fate of antioxidant molecules during the antioxidation processes. In this study, with the same view, an equal mixture of butylated hydroxyanisole (BHA) and propyl gallate (PG) in ethanol was irradiated with ultraviolet rays and the chemical structure and antioxidative activities of the resulting oxides were examined. The resulting oxides were identified as 2,3,7,8-tetrahydroxy [1] benzopyrano [5,4,3-cde] [1] benzopyran-5,10-dione (ellagic acid), which was formed from PG by coupling of dehydrogenated molecules of OH group and by dealcoholization, and propyl 3,4-dihydroxy-5-(2′-hydroxy-5′-methoxy-3′-tert-butylphenoxy)benzoate and propyl 3,5-dihydroxy-4-(2′-hydroxy-5′-methoxy-3′-tert-butylphenoxy) benzoate, both of which were dimers, one formed from a BHA/PG mixture by separation of hydrogen in aromatic hydrogen and the other from PG by dehydrogenation of OH group. All of the resulting oxides showed antioxidative activity on lard, soybean oil, and methyl oleate in the stability testing by the active oxygen method (AOM).