Determination of fumonisins B1 and B2 in corn by LC/MS with immunoaffinity column cleanup: interlaboratory study.

摘要

An interlaboratory validation study was conducted to establish the method performance characteristics of an immunoaffinity column (IAC) cleanup procedure followed by LC/MS for the determination of fumonisins B1 (FB1) and B2 (FB2) and combined FB1 + FB2 in corn. The test portion is extracted with acetonitrile-methanol-water (25 +25 + 50). The extract is filtered, diluted with phosphate-buffered saline solution and applied to an IAC. FB1 and FB2 are removed with methanol, followed by water, then directly determined by RPLC with MS detection using selected-ion monitoring of 2 characteristic ions in each case. Naturally contaminated corn samples were milled to a fine powder and mixed to produce 3 samples with target levels of combined FB1 + FB2 ranging from 350 to 4000 mg/kg. Of 15 initially participating laboratories, 2 failed to report results and another did not follow the prescribed method. Thus, valid results were obtained from 12 participants located in 11 countries. Statistical analysis of the results produced RSDr values of 4.6-11.9, 1.9-12.6 and 1.4-11.5% for FB1, FB2 and combined FB1 + FB2, respectively; the corresponding RSDR values were 19.8-23.8, 18.2-25.5 and 18.8-23.2%. The 3 concn. levels of combined FB1 + FB2 were 534, 1194 and 1954 mg/kg. HorRat values for r and R were all <2.0, indicating that the method is suitable as a regulatory method for the enforcement of EU limits for fumonisins in corn.