Development and Analysis of Aflatoxin Bi Proficiency Testing Samples of Peanut Powder
This study aims to solve the problem of poor uniformity of aflatoxin B1 proficiency tes-ting samples of peanut powder.The peanut powder was dried after being degreased with n-hexane,then the ethanol solution mixed with the substance for test were added.After mixing,drying,crush-ing,and sieving,the peanut powder was repackaged.The effects of degreasing ratio,air-drying tem-perature and time on the test results were thoroughly investigated.The results showed that when the mass ratio of peanut powder to n-hexane was 1:2 and air-dried at 60 ℃ for 12 hours,the test results of the samples exhibited a high degree of uniformity and the best stability.Under these conditions,two batches of samples with concentrations of 10 μg/kg and 20 μg/kg respectively were prepared.They were analyzed by triple quadrupole liquid chromatography-mass spectrometry and evaluated by the isotope internal standard method.The standard recovery rate of the samples was above 85％,with good uniformity and stability,the samples were fully met the requirements of proficiency testing.
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