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Direct electrochemical oxidation of DNA on polycrystalline gold electrodes

机译:DNA在多晶金电极上的直接电化学氧化

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Electrochemical CV and SWV studies were performed with double stranded DNA from salmon testes (dsDNA) and single stranded DNAs, containing 25 nucleotides (ssDNA) directly adsorbed at polycrystalline An electrodes. A distinct oxidation peak at + 730 mV (SWV, scan rate 0.248 V s(-1)) or at + 730 - + 780 mV (CV, scan rate from 0.3 to 1 V s(-1)) was obtained with DNA-modified Au electrodes after a time-dependent prepolarization step at a positive potential value, i.e., at + 500 mV (vs. Ag AgCl), performed with the DNA-modified Au electrodes dipped in a blank buffer solution. No electrochemical activity was detected when ssDNA, containing no guanines, was used for adsorptive modification of the Au electrodes. Electrochemical impedance measurements registered a possible reorganization of the adsorbed DNA layer in the course of the prepolarization, accompanied by decreasing in-phase impedance. ne results enable us to relate the oxidation process observed at the DNA-modified Au electrodes with the oxidation of guanine residues in DNA. [References: 39]
机译:使用鲑鱼睾丸的双链DNA(dsDNA)和单链DNA进行电化学CV和SWV研究,该DNA包含直接吸附在多晶An电极上的25个核苷酸(ssDNA)。用DNA-获得了在+ 730 mV(SWV,扫描速率0.248 V s(-1))或在+ 730-+ 780 mV(CV,扫描速率从0.3到1 V s(-1))的明显氧化峰。在经过时间依赖性的预极化步骤之后,在DNA修饰的Au电极浸入空白缓冲液中的情况下,以正电位值(即+500 mV(vs。Ag AgCl))进行随时间变化的Au修饰电极。当不包含鸟嘌呤的ssDNA用于Au电极的吸附修饰时,未检测到电化学活性。电化学阻抗测量结果表明,在预极化过程中吸附的DNA层可能会发生重组,并伴有同相阻抗的降低。新的结果使我们能够将在DNA修饰的Au电极上观察到的氧化过程与DNA中鸟嘌呤残基的氧化联系起来。 [参考:39]

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