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| Determination of oxidation induction time of vegetable oils in aqueous medium |
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| DOI： |
| KeyWord:aqueous medium vegetable oil oxidation induction time AC impedance method |
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| Abstract: |
| A green and environment-friendly system for determining the oxidation induction time of vegetable oil was developed. The volume ratio of oil to water, flow rate and added copper wire length in flow system were optimized. The reduced graphene oxide modified glassy carbon electrode (rGO/GCE)was used as the working electrode, and the impedance of the aqueous phase mixed with olive oil of different oxidation degree and PBS at pH 7 was measured by AC impedance method. The results indicated that the optimal determination conditions of flow system were obtained as follows: volume ratio of oil to water 1∶?1, flow rate 1.68 mL/min and added copper wire length 40 cm. The impedance changes caused by water-soluble substance of olive oil in oxidation process could be measured sensitively and rapidly by AC impedance method. The relative deviation of the oxidation induction time between AC impedance method and national standard method was less than 5%. Moreover, there was no significant difference in determination results obtained by the AC impedance method and national standard method. Therefore, the aqueous system could accurately determine the oxidation induction time of vegetable oil. |
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