Objectives To explore the method of DNPH pre-column derivation-high performance liquid chromatography determination of trace formaldehyde in food packaging materials.
Methods After immersed into 2,4-dinitrophenyl hydrazine, the sample was derived 20 min in 60℃ water bath. Trace formaldehyde in food packaging material was determined by liquid chromatography after cyclohexane extraction.
Results The linearity of formaldehyde is in the range of 0~8 μg/mL, correlation coefficient is 0.9998, the relative standard deviation is 0.9%~2.6%, while the recovery rate is 91.0%~101.5%.
Conclusions This method is highly sensitive, selective, preciseand accurate, simple and quick which is suitable for determination of formaldehyde in food packaging materials.
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