Abstract Glassy carbon electrodes (GCE) modified with carboxylated single-walled carbon nanotubes (SWNT-COOH) and CeO2-surfactants dispersions are developed for the capsaicin quantification. The effect of cationic cetylpyridinium bromide (CPB), anionic sodium dodecylsulfate (SDS) and nonionic Triton X100 as co-modifiers are tested. CeO2-CPB/SWNT-COOH/GCE provides 2.8- and 1.9-fold increase of capsaicin oxidation currents in comparison to bare GCE and SWNT-COOH/GCE, respectively, confirming the synergetic effect of the modifiers. Scanning electron microscopy (SEM) data confirm successful immobilization of the nanomaterials on the electrode surface leading to the significant changes in its morphology. The parameters of capsaicin electrooxidation are found. Differential pulse mode is applied for the capsaicin determination. The pulse parameters are optimized. The linear dynamic ranges of 0.10–7.5 and 7.5–500 μM of capsaicin with the limits of detection and quantification of 28 and 92 nM respectively confirm the high sensitivity of the method developed. The selectivity of the electrode toward capsaicinoids is proved. The method was applied for the total capsaicinoids quantification in real samples (red hot pepper spices and tinctures of Capsicum annuum L.). A good agreement with the UV-spectroscopic data is obtained.

中文翻译：

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使用 CeO 2 表面活性剂/SWNT 修饰电极伏安法测定辣椒素

摘要 开发了用羧化单壁碳纳米管 (SWNT-COOH) 和 CeO2 表面活性剂分散体改性的玻碳电极 (GCE)，用于辣椒素的定量。测试了阳离子十六烷基溴化吡啶鎓 (CPB)、阴离子十二烷基硫酸钠 (SDS) 和非离子 Triton X100 作为共改性剂的效果。与裸 GCE 和 SWNT-COOH/GCE 相比，CeO2-CPB/SWNT-COOH/GCE 分别使辣椒素氧化电流增加了 2.8 倍和 1.9 倍，证实了改性剂的协同作用。扫描电子显微镜 (SEM) 数据证实纳米材料成功固定在电极表面，导致其形态发生显着变化。确定了辣椒素电氧化的参数。差分脉冲模式用于辣椒素测定。优化脉冲参数。辣椒素的线性动态范围为 0.10–7.5 和 7.5–500 μM，检测限和定量限分别为 28 和 92 nM，这证实了所开发方法的高灵敏度。证明了电极对辣椒素的选择性。该方法适用于实际样品（红辣椒香料和辣椒酊剂）中总辣椒素的定量。获得了与紫外光谱数据的良好一致性。该方法适用于实际样品（红辣椒香料和辣椒酊剂）中总辣椒素的定量。获得了与紫外光谱数据的良好一致性。该方法适用于实际样品（红辣椒香料和辣椒酊剂）中总辣椒素的定量。获得了与紫外光谱数据的良好一致性。