二硫化钼负载纳米金粒子修饰电极测定酱油中曲酸

Determination of kojic acid in soy sauce by MoS2/Au nanoparticles modified electrode

中文关键词:  酱油  曲酸  差分脉冲伏安法  二硫化钼  纳米金  修饰电极

英文关键词:soy sauce  kojic acid  differential pulse voltammetry  MoS2  gold nanoparticles  modified electrode

中文摘要:

      目的 建立二硫化钼负载纳米金粒子(MoS2/gold nanoparticles, MoS2/AuNPs)修饰电极快速测定酱油中曲酸的方法。方法 采用柠檬酸钠还原氯金酸的方法制备纳米金颗粒, 采用恒电位沉积法制备二硫化钼负载纳米金粒子的修饰电极。研究曲酸在不同修饰电极上的电化学行为, 探讨缓冲溶液类型、pH、MoS2用量和沉积时间对曲酸电化学行为的影响。结果 在5~500 μmol/L范围内, 曲酸浓度与峰电流呈现良好的线性关系, 回归方程为ipa (μA)=0.00952C (μmol/L)-0.21898, r2=0.99345。检出限为3.9 μmol/L, 回收率为97.2%~105.5%, 相对标准偏差小于8.0%。结论 本方法所构建的修饰电极具有较好的抗干扰性、重现性和稳定性, 适用于酱油样品中曲酸的分析。

英文摘要:

      Objective To establish a method for rapid determination of kojic acid in soy sauce by MoS2/gold nanoparticles (MoS2/AuNPs) modified electrode. Methods The gold nanoparticles were prepared by reducing chloroauric acid by sodium citrate, and the modified electrode with gold nanoparticles loaded on MoS2 was prepared by the constant potential deposition method. The electrochemical characteristics of kojic acid on different modified electrodes was explored, and the effects of buffer solution type, pH, amount of MoS2 and deposition time on the electrochemical behavior of kojic acid were discussed. Results The kojic acid concentration and peak current showed a good linear relationship in the range of 5-500 μmol/L and the regression equation was ipa (μA)=0.00952C (μmol/L)-0.21898, r2=0.99345. The limit of detection was 3.9 μmol/L, the recoveries were 97.2%-105.5%, and the relative standard deviations were less than 8.0%. Conclusion The modified electrode constructed by this method has good anti-interference, reproducibility and stability, and is suitable for the analysis of kojic acid in soy sauce samples.