The School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin, 150040, People's Republic of China.
The School of Life Science and Technology, Harbin Institute of Technology, Harbin, 150040, People's Republic of China.
Mikrochim Acta. 2023 Sep 23;190(10):413. doi: 10.1007/s00604-023-05967-w.
A stable and innovative composite film-modified electrode based on Dawson polyoxometalates HPMoVO (PMoV) and ionic liquid (BMIMBr)-decorated carbon nanotubes, annotated as PEI/(PMoV/BMIMBr-CNTs), has been constructed by using the layer-by-layer self-assembly (LBL) method for the determination of L-tyrosine. The combination of three active components not only offers higher conductivity to facilitate rapid electron transfer, but also avoids the accumulation of PMoV to expand the contact area and increase the reactive active sites. The modified electrode exhibits outstanding sensing performance for determination of Tyr with wide linear determination range of 5.8×10 M ~ 1.2×10 M, low determination limit of 1.7×10M (S/N=3), high selectivity for common interferences, and excellent stability at the potential of +0.78 V (vs. Ag/AgCl (3 M KCl)). The relative standard deviation (RSD) of 4.3% for five groups of parallel experiments shows the satisfactory repeatability of PEI/(PMoV/BMIMBr-CNTs). In addition, for determination of Tyr, the PEI/(PMoV/BMIMBr-CNTs) shows good recoveries of 98.8-99.8% in meat floss, which can be feasible in practical application.
一种基于 Dawson 多金属氧酸盐 HPMoVO（PMoV）和离子液体（BMIMBr）修饰的碳纳米管的稳定且创新的复合膜修饰电极，被标注为 PEI/（PMoV/BMIMBr-CNTs），通过层层自组装（LBL）方法构建，用于 L-酪氨酸的测定。三种活性成分的结合不仅提供了更高的导电性，以促进快速电子转移，还避免了 PMoV 的积累，从而扩大了接触面积并增加了反应活性位点。修饰电极对 Tyr 的测定具有出色的传感性能，线性测定范围为 5.8×10^-6 M 至 1.2×10^-5 M，测定下限低至 1.7×10^-6 M（S/N=3），对常见干扰物具有高选择性，并且在+0.78 V（相对于 Ag/AgCl（3 M KCl））的电位下具有出色的稳定性。五组平行实验的相对标准偏差（RSD）为 4.3%，表明 PEI/（PMoV/BMIMBr-CNTs）具有良好的重现性。此外，对于 Tyr 的测定，PEI/（PMoV/BMIMBr-CNTs）在肉松中的回收率为 98.8-99.8%，在实际应用中是可行的。
