Layer-by-layer fabrication of g-C3N4 coating for headspace solid-phase microextraction of food additives followed by gas chromatography-flame ionization detection?

Analytical Methods Pub Date: 2017-12-11 DOI: 10.1039/C7AY02515G

Abstract

This work demonstrates a simple layer-by-layer approach for producing graphitic carbon nitride (g-C3N4) coated fibers for solid-phase microextraction (SPME) with sol-SiO2 as the binder. With the prepared g-C3N4 coated SPME fiber, a headspace SPME coupled with GC (HS-SPME-GC) method was developed for the analysis of food additives. Detection limits of 0.2–4.0 ng mL?1 were obtained for the analysis of five food additives including methyl cinnamate, ethyl cinnamate, benzyl cinnamate, isobutyl cinnamate, and butylated hydroxytoluene by the developed HS-SPME-GC method with flame ionization detection. The method exhibited good linearity in the range of 0.5–1000.0 ng mL?1 with the coefficient of determination (R2) not lower than 0.9930. The repeatability of the prepared coating was 2.2–5.4% (n = 3) for the same fiber, and the reproducibility was in the range of 5.3–12.4% for three different fibers. The recovery of the developed method was in the range of 73.3–109.8%. Based on the as-prepared g-C3N4 coating, the developed HS-SPME-GC method was successfully applied to the analysis of real samples including biscuits and milk tea beverages.

Graphical abstract: Layer-by-layer fabrication of g-C3N4 coating for headspace solid-phase microextraction of food additives followed by gas chromatography-flame ionization detection
Recommended Literature