Kinetic studies in the chemistry of rubber and related materials. V. The inhibitory effect of phenolic compounds on the thermal oxidation of ethyl linoleate

Alkylresorcinols as antioxidants: hydrogen donation and peroxyl radical-scavenging effects

“…Litwinienko et al 21 studied the effects of hydroquinone, resorcinol and catechol on the oxidation of linoleic acid, initiated by a,a'-azoisobutyronitrile at different temperatures, and obtained paradoxical results showing that resorcinol and catechol were equally effective and were better antioxidants than hydroquinone. These results are, however, opposite to those of Bolland and ten Have, 13 who determined the relative antioxidant ef®ciency of resorcinol, catechol and hydroquinone in the oxidation of ethyl linoleate as 0.02, 0.63 and 1.00 respectively.…”

“…12 Resorcinol (E o = 1179 mV), on the other hand, has only negligible activity as a peroxyl radical scavenger. 13 Similarly, the bond dissociation enthalpy (BDE) of the phenolic OÐH bond in olivetol was found to be 89.9 kcal mol À1 , 14 compared with 75.8 kcal mol À1 for a-tocopherol.…”

Enhancement of bleomycin—iron free radical damage to DNA by antioxidants and their inhibition of lipid peroxidation

“…Most of the scavenging lipid antioxidants, such as the phenols, are reducing substances which act by hydrogen donation. Early studies [9], still vahd today, suggest that the reducing antioxidants (AH) react primarily with the lipid peroxy radicals (LOO') terminating the radical …”

Synthesis of copolymer beads with various phenolic derivatives attached via different linkages and their antioxidation activity

“…12 To date, many researchers have studied the antioxidation mechanism of phenolic compounds from theoretical or experimental points of view. [15][16][17] Bolland and Have 18 reported that the antioxidant properties of phenols are due to their ability to quench the chain carrying peroxy radicals of the substrate by transfer of the hydroxyl hydrogen to form hydroperoxides as follows:…”

“…The hydroperoxide content of 1,4-dioxane generated was determined by iodometry as follows. 18 The copolymer beads were removed by decantation, and a 0.12 mol/dm 3 where v is the volume of the titrant added to the 1,4-dioxane containing hydroperoxide (dm 3 ), b is the volume of the titrant for the blank test (dm 3 ), c is the concentration of the titrant (mmol/dm 3 ), and V is the volume of titrated 1,4-dioxane (dm 3 ). The inhibition ratio was calculated from the concentration of hydroperoxide generated as follows:…”