以铋离子为探针聚瓜氨酸修饰电极测定食品中脱氢乙酸钠
马心英 , 孟令辉 , 孙巧玲 , 吕惠萍 , 陈美凤 , 朱琪
现代化工 ›› 2026, Vol. 46 ›› Issue (2) : 253 -257.
以铋离子为探针聚瓜氨酸修饰电极测定食品中脱氢乙酸钠
Determination of sodium dehydroacetate using bismuth ion as probe by polycitrulline-modified electrode
利用循环伏安法制备了聚瓜氨酸修饰电极(polycitrulline modified electrode,pCIT/GCE),与裸电极相比,该修饰电极能够明显增大铋离子的氧化还原峰电流,显示了良好的电催化作用。脱氢乙酸钠曾被用为食品添加剂,因其对人体健康存在危害,在2025年2月8日实施的我国《食品安全国家标准 食品添加剂使用标准》(GB 2760—2024)中禁止使用。脱氢乙酸钠本身无电化学活性,不能直接用电化学方法测定,但可以与铋离子生成配合物,因此利用铋离子在聚瓜氨酸修饰电极上的还原峰电流随脱氢乙酸钠浓度增大而减小,建立了一种基于铋离子为探针测定食品中脱氢乙酸钠电化学新方法。实验结果发现,当脱氢乙酸钠浓度在1.00×10-8~6.00×10-6 mol/L范围内,铋离子的还原峰电流与脱氢乙酸钠浓度的对数呈现显著的线性关系,避免了在电化学测定中,因被测物质浓度增大工作曲线出现拐点而产生分段现象,线性方程为ipc=113.56-32.38lg c(mol/L),相关系数R=-0.992 5。脱氢乙酸钠检出限为1.00×10-8 mol/L,用于面包等样品测定,回收率在97.50%~103.75%之间,具有实际应用前景。
A polycitrulline-modified electrode was prepared using cyclic voltammetry.Compared to the bare electrode,this modified electrode significantly enhanced the redox peak current of bismuth ions,demonstrating excellent electrocatalytic activity.Sodium dehydroacetate was once used as a food additive,but was banned in China’s National Food Safety Standard for the Use of Food Additives (GB 2760—2024),implemented on February 8,2025,due to its harmful effects on human health.Sodium dehydroacetate itself is electrochemically inactive and cannot be directly measured by electrochemical methods.However,it can form a complex with bismuth ions.Thus,a novel electrochemical method was developed to determine sodium dehydroacetate in food based on the decrease in the reduction peak current of bismuth ions on the polycitrulline-modified electrode with increasing sodium dehydroacetate concentration.Experimental results showed that when the sodium dehydroacetate concentration ranged from 1.00×10-8 to 6.00×10-6 mol/L,the reduction peak current of bismuth ions exhibited a significant linear relationship with the logarithm of sodium dehydroacetate concentration.This avoided the segmented working curve phenomenon caused by inflection points at higher concentrations in electrochemical measurements.The linear equation was:ipc=113.56-32.38lgc (mol/L),with a correlation coefficient R=-0.992 5.The detection limit for sodium dehydroacetate was 1.00×10-8 mol/L.When applied to bread and other samples,the recovery rate ranged between 97.50% and 103.75%,indicating promising practical applications.
citrulline / modified electrode / bismuth ion / sodium dehydroacetate
| [1] |
董岩岩. 脱氢乙酸钠对鸡血管钙化的影响及维生素K2的保护作用[D]. 扬州: 扬州大学, 2024. |
| [2] |
刘峰, 徐飞, 袁秀娟, |
| [3] |
李颖. 面包糕点添加剂新变动:脱氢乙酸钠退出部分食品领域[J]. 中国质量万里行, 2025,(2):80. |
| [4] |
|
| [5] |
陈钊琦. 国家卫生健康委发布50项新食品安全国家标准[N]. 中国食品安全报, 2025-03-29(A01). |
| [6] |
邓迎春, 徐晓楠, 郭旭光, |
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
张敏, 刘冬杰, 魏忆, |
/
| 〈 |
|
〉 |