将辣根过氧化物酶(HRP)固定在室温离子液体(RTIL)/聚二茂铁硅烷(PFS)/DNA复合材料修饰的玻碳电极(GCE)表面.构建了GCE/DNA/PFS/RTIL/HRP修饰电极,详细地研究了该修饰电极的电催化行为,优化了电解质溶液的pH值和RTIL的体积对催化过氧化氢(H2O2)的影响.电化学实验结果表明,DNA、PFS和RTIL复合膜既为HRP提供了一个生物兼容的微环境;又有效地促进了电子在HRP和电极表面之间的传递.在最优实验条件下,该修饰电极对H2O2具有快速的催化响应,在2 s内即可达到稳态电流的95%,其响应在3.25μmol/L～1.47 mmol/L(r=0.999,n=10)和1.86～5.35 mmol/L(r=0.996,n=12)范围内呈良好的线性关系,检出限为0.86 μmol/L.该传感器灵敏度高、重现性和稳定性好.此外,该修饰电极还能催化O2还原.
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