sensitive and selective determination of riboflavin in milk and soymilk powder by multi-walled carbon nanotubes and ionic liquid [bmpi]pf6 modified electrode

A novel electrochemical method to detect riboflavin was proposed using a multi-walled carbon nanotubes and ionic liquid n-butyl-n-methyl-piperidinium hexafluorophosphate composite film modified glassy carbon electrode (mwnts-[bmpi]pf6/gce). a well-defined cv behavior with a pair of sensitive and well-shaped redox peak was observed, and the response value of riboflavin at mwnts-[bmpi]pf6/gce is much higher than that at mwnts/gce in 0.1 mol l−1 hac-naac buffer solution (ph 4.5). the electrochemical approach based on a sensitive dpv analytical signal exhibits an excellent analytical performance with a wide linear range (2.6 × 10−8 to 1.3 × 10−6 mol l−1) and low detection limit (4.7 × 10−9 mol l−1) for the riboflavin. moreover, the proposed method possesses a potential practical application value and can be employed for the quantitative analysis of trace riboflavin with a recovery of 95.8–102.4 % in food samples such as milk and soymilk powder.