Synthesis of poly(methacrylic acid)/functionalized carbon nanotubes nanocomposite modified electrode for electrochemical sensitive determination of acrylamide in food sample
Ting Xin, Weifeng Chen, Nan Su. Zhao Wang
Abstract
Poly(methacrylic acid) and functionalized carbon nanotubes nanocomposite modified glassy carbon electrodes (PMAA, f-CNTs, and GCE) have been synthesized for electrochemically sensitive determination of acrylamide (AA) in food samples. A study of the structure and morphology of modified electrodes using XRD and FE-SEM analyses showed that the f-CNTs were completely covered by PMAA molecules in the nanocomposite. Electrochemical studies on the determination of AA by PMAA/f-CNTs/GCE sensors using CV and DPV techniques showed that PMAA/f-CNTs nanocomposite enhanced the sensitivity and selectivity of an electrochemical sensor due to the synergetic effect of f-CNTs and PMAA. Results indicated a sensitivity of 0.0171 µA/μM, detection limit of 15 μM and a linear range of 0–2400 μM. Results of the study on the applicability and verification of the PMAA/f-CNTs/GCE as an AA sensor in prepared real samples of potato crisps indicated a notable conformity between the results of DPV and ELISA assays, and the relatively small values of RSD (3.41–5.11 %) and recovery (97.50–99.00 %) values for DPV analysis were acceptable which corroborated the appropriate applicability and validation of the results of PMAA/f-CNTs/GCE for determination of AA content in food samples.