| To solve the problems of long extraction time and low efficiency of the existing methods for oil extraction in the determination of acid value and peroxide value of sesame paste and peanut butter, the acetone water solution was added to the sample to denature and flocculate the protein, thereby destroying the stable sol system of peanut butter/sesame paste, so that the system could be quickly stratified, and the oil was quickly freed out, so the oil could be extracted efficiently and quickly. The specific extraction method was as follows: adding acetone-water (volume ratio 1∶1) solution to the sesame paste and peanut butter sample (ratio of samples mass to solvent volume 1∶1), stirring and mixing well, adding petroleum ether 3 times the sample volume, shaking, standing for stratification for about 30 min, the upper organic phase was filtered through a funnel filled with anhydrous sodium sulfate, and the solvent was removed at 40℃ to obtain oil. The extraction time was greatly shortened by adding acetone water solution, the efficiency was greatly improved, and the risk of oil oxidation caused by long extraction time was reduced, and the accuracy of the results was improved. The method was proved to be accurate and reliable by means of precision and accuracy methodology. In conclusion, the extraction method can be used to extract oil from sesame paste and peanut butter products for the determination of acid value and peroxide value. |
