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Bisphenol A: Toxic Plastics Chemical in Canned Food: Methods of analysis
Laboratory method
Samples were tested at the North Carolina-based Southern Testing and Research Division of Microbac Laboratories, Inc. As a member of the nationwide Microbac laboratory group, Southern Testing & Research Laboratories is full service laboratory offering a wide range of chemical and microbiological testing and research services for the environmental, food/feed, pharmaceutical, agrochemical and industrial hygiene industries.
The lab analyzed samples via liquid chromatography and x-ray fluorescence to analyze BPA concentrations. The method is described in Sensitive and Rapid Reversed-Phase Liquid Chromatography-Fluorescence Method For Determining Bisphenol A Diglycidyl Ether in Aqueous-Based Food Simulates. J. Assoc. of Analytical Chemistry (Vol. 74, No. 6, 1991) The lab modified the LC parameters according to Agilent Technologies application note.
Quality Assurance / Quality Control
Six matrices were spiked with Bisphenol A during the run and showed reasonable recovery. Further quality assurance was accomplished by taking three split samples from five canned foods. The results show reasonable concordance between the three samples for all foods. The standard deviation for all 15 samples ranged from 3 to 8 ppb (chicken soup: 79 +/- 4 ppb, green beans: 99 +/- 8 ppb, mixed vegetables: 167 +/- 3 ppb, ravioli: 66 +/- 4 ppb, tuna: 26 +/- 5 ppb).