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Abstract

A simple, reliable and suitable analytical method was developed for solid phase extraction of bisphenol A in several canned food products such as beverages, fruits, vegetables and foodstuffs bought in Sudan markets. The analysis done by using a packed Multi Walled Carbon Nanotubes (MWNTs) mini-column followed by highperformance liquid chromatography with fluorescence detection. In summary, we have preliminarily demonstrated that as promising sorbents, MWNTs have great potential for solid phase extraction of BPA. The recommended parameters of proposed method influencing the preconcentration of the analytes, such as pH of the sample, flow rate and sample volume have been used. Under the optimized conditions, the calibration graphs were linear with the correlation coefficient ranged 0.9906-0.9999. According to the results, the concentrations of BPA in samples exposed to direct sunlight were higher than samples that stored at room temperature. The range of BPA level of beverages were (0.3-0.8ng/ml) at room temperature where it were (1.5-2.1ng/mL) at beverages exposed to direct sunlight , in vegetables the levels were (20.0-38.0ng/g) at room temperature and (30.0-43.0ng/g) in vegetables exposed to direct sunlight , the levels in fruits were (6.0-24.0ng/g) at room temperature and in fruits exposed to direct sunlight were (8.0-38.0ng/g), in fat-containing products the levels of BPA at room temperature were (2.1-45.0ng/g) and (3.0-55.0ng/g) in products which exposed to direct sunlight. Limits of detection (S/N=3) from 0.1ng/mL in beverages to 5.5 ng/g in fruits. The accuracy of proposed method was tested by recovery measurements on standard bisphenol A spiked canned food samples, the recoveries ranged 90.2-102.0% were obtained.