Improved Determination Methods for Acid and Peroxide Values in Foods

The feasibilities of Soxhlet extraction and water bath heating for oil extraction were investigated and compared with the national standard method in this paper.The effects of temperature and time on the oil extraction were analyzed.Results showed that the temperature showed effects on both the acid and peroxide values(P0.05) and had higher effect on peroxide value than acid value.The treatment time showed little effect on acid value(P0.05),but significantly influenced the peroxide value of the oil(P0.05).No significant difference in acid or peroxides values of the oil extracted by the three methods was found(P0.05).Besides,the key step and instructions of the methods were discussed in detail.