Synthesis and application of multi-walled carbon nanotubes-molecularly imprinted sol-gel composite material for on-line solid-phase extraction and high-performance liquid chromatography determination of trace Sudan IV |
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Authors: | Zhaohui Zhang Huabin Zhang Shouzhuo Yao |
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Institution: | a College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China b State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China |
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Abstract: | A novel composite material of multi-walled carbon nanotubes (MWNTs)-Sudan IV molecularly imprinted polymers (MIPs) was prepared by surface molecular imprinting technique in combination with sol-gel technology. The MWNTs-MIPs were evaluated by scanning electron micrograph (SEM), Fourier transform infrared spectroscopy (FT-IR), and adsorption experiments. The results showed that the MWNTs-MIPs exhibited good selective recognition to Sudan IV. The maximum saturated binding capacity (Qmax) is 63.2 μmol g−1. Applied as sorbent, the MWNTs-MIPs were used for the determination of trace Sudan IV in chilli powder by on-line solid-phase extraction-high-performance liquid chromatography (SPE-HPLC). The results showed that an enrichment factor of 741 was achieved with a loading flow rate of 1.0 mL min−1 for sampling 50 mL. The MWNTs-MIPs provided a fast and convenience determination platform for Sudan IV in real samples. |
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Keywords: | Molecular imprinting Multi-walled carbon nanotubes Sudan IV On-line solid-phase extraction High-performance liquid chromatography |
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