Electropolymerization of single-walled carbon nanotubes composited with polypyrrole as a solid-phase microextraction fiber for the detection of acrylamide in food samples using GC with electron-capture detection

We developed a solid-phase microextraction coupled to GC with electron-capture detection method for the detection of acrylamide in food samples. Single-walled carbon nanotubes and polypyrrole were electropolymerized onto a stainless-steel wire as a coating, which possessed a homogeneous, porous, and wrinkled surface, chemical and mechanical stability, long lifespan (over 300 extractions), and good extraction efficiency for acrylamide. The linearity range between the signal intensity and the acrylamide concentration was found to be in the range 0.001-1 g/mL, and the coefficient of determination was 0.9985. The LOD, defined as three times the baseline noise, was 0.26 ng/mL. The reproducibility for each single fiber (n = 6) and the fiber-to-fiber (n = 5) repeatability prepared in the same batch were less than 4.1 and 11.2%, respectively.