以镍镉合金为基底,将壳聚糖滴涂在碳纳米管修饰的超薄碳糊电极表面制成电化学传感器（CTSCNTs-UTCPE）,利用循环伏安法（CV）、半微分伏安法研究硝基酚异构体在该电极上的电化学行为。考察了底液种类、酸碱度、扫描速度、起始电位和富...以镍镉合金为基底,将壳聚糖滴涂在碳纳米管修饰的超薄碳糊电极表面制成电化学传感器（CTSCNTs-UTCPE）,利用循环伏安法（CV）、半微分伏安法研究硝基酚异构体在该电极上的电化学行为。考察了底液种类、酸碱度、扫描速度、起始电位和富集时间对检测结果的影响。与镍铬合金电极、超薄碳糊电极（UTCPE）和碳纳米管修饰超薄碳糊电极（CNTs-UTCPE）相比,由于壳聚糖和碳纳米管的协同效应,硝基酚异构体在p H 5.72的B-R中氧化电流较高。在最佳条件下,传感器对邻、间、对硝基酚的检测范围分别为4.0×10-7-8.0×10-5mol/L,4.0×10-7-8.0×10-5mol/L,8.0×10-7-8.0×10-5mol/L;检出限（S/N=3）分别为2.3×10-7,2.9×10-7,6.7×10-7mol/L。该传感器显示出良好的稳定性和抗干扰性能,可实现对人工水样中硝基酚异构体的同时检测。展开更多
The interaction of water-soluble P-(N,N-dimethylaminomethyl)-calix[8]arene(CX8)with calf thymus DNA was studied using neutral red(NR) as a probe by uv-vis spectroscopy.The effect factors such as the pH of solution and...The interaction of water-soluble P-(N,N-dimethylaminomethyl)-calix[8]arene(CX8)with calf thymus DNA was studied using neutral red(NR) as a probe by uv-vis spectroscopy.The effect factors such as the pH of solution and ionic strength on the spectra were also investigated.The interaction mechanism was proposed.The results show that the strong electrostatic interaction between DNA and CX8 existed,on the one hand,the oxyphosphate anion of DNA can be neutralized by CX8 partally,which induced the contraction of DNA and the conformational change of DNA,which led to release NR from NDA partially.On the other hand,the CX8 can also compete the electrostatic sites with NR directly.展开更多
文摘以镍镉合金为基底,将壳聚糖滴涂在碳纳米管修饰的超薄碳糊电极表面制成电化学传感器（CTSCNTs-UTCPE）,利用循环伏安法（CV）、半微分伏安法研究硝基酚异构体在该电极上的电化学行为。考察了底液种类、酸碱度、扫描速度、起始电位和富集时间对检测结果的影响。与镍铬合金电极、超薄碳糊电极（UTCPE）和碳纳米管修饰超薄碳糊电极（CNTs-UTCPE）相比,由于壳聚糖和碳纳米管的协同效应,硝基酚异构体在p H 5.72的B-R中氧化电流较高。在最佳条件下,传感器对邻、间、对硝基酚的检测范围分别为4.0×10-7-8.0×10-5mol/L,4.0×10-7-8.0×10-5mol/L,8.0×10-7-8.0×10-5mol/L;检出限（S/N=3）分别为2.3×10-7,2.9×10-7,6.7×10-7mol/L。该传感器显示出良好的稳定性和抗干扰性能,可实现对人工水样中硝基酚异构体的同时检测。
文摘The interaction of water-soluble P-(N,N-dimethylaminomethyl)-calix[8]arene(CX8)with calf thymus DNA was studied using neutral red(NR) as a probe by uv-vis spectroscopy.The effect factors such as the pH of solution and ionic strength on the spectra were also investigated.The interaction mechanism was proposed.The results show that the strong electrostatic interaction between DNA and CX8 existed,on the one hand,the oxyphosphate anion of DNA can be neutralized by CX8 partally,which induced the contraction of DNA and the conformational change of DNA,which led to release NR from NDA partially.On the other hand,the CX8 can also compete the electrostatic sites with NR directly.
