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首页> 外文期刊>Analytical Sciences >Preparation of Tetraheptylammonium Iodide-Iodine Graphite-Multiwall Carbon Nanotube Paste Electrode: Electrocatalytic Determination of Ascorbic Acid in Pharmaceuticals and Foods
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Preparation of Tetraheptylammonium Iodide-Iodine Graphite-Multiwall Carbon Nanotube Paste Electrode: Electrocatalytic Determination of Ascorbic Acid in Pharmaceuticals and Foods

机译：碘化四庚基铵-碘石墨-多壁碳纳米管糊电极的制备：电催化法测定药品和食品中的抗坏血酸

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摘要

The present work describes the construction of a new modified graphite-multiwall carbon nanotube paste electrode by casting the appropriate mixture of tetraheptylammonium iodide-iodine as a new modifier. The modified paste electrode was used for the determination of ascorbic acid (AA) in a phosphate buffer solution (pH 2.0). When compared to activated carbon, a graphite and multiwall carbon nanotube paste electrode containing a new modifier, the proposed modified paste electrode not only shifted the oxidation potential of AA towards a less-positive potential but also enhanced its oxidation peak current. Further, the oxidation of AA was highly stable at the modified paste electrode. The optimum analytical conditions were sought. The current response of AA increases linearly while increasing its concentration from 5.6 × 10~(?5) to 1.2 × 10~(?2) M with a correlation coefficient of 0.9991; the detection limit (3 σ ) was found to be of 3.6 × 10~(?5) M. The present modified paste electrode was also successfully used for the determination of AA in the presence of common interference compounds. The present modified electrode was successfully demonstrated towards the determination of AA in pharmaceutical and food samples.
机译：本工作描述了通过浇铸适当的碘化四庚基碘-碘作为新的改性剂的混合物来构造新的改性石墨-多壁碳纳米管糊状电极的方法。修饰的糊状电极用于测定磷酸盐缓冲溶液（pH 2.0）中的抗坏血酸（AA）。与活性炭，含有新型改性剂的石墨和多壁碳纳米管糊状电极相比，所提出的改性糊状电极不仅将AA的氧化电位移向正电位，而且还提高了其氧化峰值电流。此外，AA的氧化在改性糊状电极上是高度稳定的。寻找最佳分析条件。 AA的电流响应线性增加，浓度从5.6×10〜（？5）增加到1.2×10〜（？2）M，相关系数为0.9991。检出限（3σ）为3.6×10〜（？5）M。在存在常见干扰化合物的情况下，本改进的糊状电极也成功地用于测定AA。本修饰电极已成功证明可用于测定药品和食品样品中的氨基酸。

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