| The antioxidation kinetics of α-tocopherol in corn oil, soybean oil and oil-tea camellia seed oil were studied. Different dosages of α-tocopherol were added into pure corn oil, soybean oil and oil-tea camellia seed oil, then Schaal oven oxidation experiment was conducted,and the peroxide values and p-anisidne values were determined regularly and total oxidation values were calculated. The regression coefficient from first-order kinetics reaction or zero-order kinetics reaction indicated that the fitting equations of peroxide values,p-anisidne values and total oxidation values with oxidation time were established, and the rate constant of hydroperoxides compounds formation could substitute the oxidation rate constant of oil, thus the oxidation rate constants of oil added with different dosages of α-tocopherol were obtained. The results indicated that the oxidation rate constant decreased gradually with the dosage of α-tocopherol increasing when the dosage of α-tocopherol was lower than the optimal dosage, which indicated that the antioxidant efficiency of α-tocopherol was growing. On the contrary, the oxidation rate constant increased gradually until exceeding that of the blank with the dosage of α-tocopherol improving when the dosage of α-tocopherol was higher than the optimal dosage, which indicated that the antioxidant efficiency of α-tocopherol was weakening until prooxidation appeared. Therefore, it was feasible to explore the antioxidant efficiency of different dosages of α-tocopherol in corn oil, soybean oil and oil-tea camellia seed oil through the oxidation rate constant. |
