锌硼共掺杂碳点的制备及其在检测亚硫酸根中的应用

Preparation of Zinc and Boron co-Doped Carbon Dots and Their Application in the Detection of Sulfite

亚硫酸根常作为食品添加剂用于抑制酶促、非酶促反应过程和微生物的生长,但过量摄入亚硫酸根对人体有害。因此,发展用于快速检测自来水和食品中微量亚硫酸根的方法十分必要。本文利用邻氨基苯硼酸和ZnCl2为原料通过一步水热法制备了能够发射黄色荧光(535 nm)的锌硼共掺杂碳点(ZnB-CDs),并对其形貌和性质进行了表征。基于亚硫酸根降低ZnB-CDs的表面缺陷使其荧光增强的现象,建立了亚硫酸根的荧光检测新方法。在最优条件下,该方法的线性范围为4~160μmol/L,检出限为1.24μmol/L,应用于自来水、白砂糖和冰糖中亚硫酸根含量的测定,回收率为96.7%~107.2%。

Sulfite is often utilized as food additives to inhibit the process of enzymatic,non-enzymatic reaction and microbial growth,but excessive intake of sulfite is harmful to human body.Therefore,it is necessary to develop methods for rapid detection of trace sulfite in tap water and food.In this work,a simple one-pot hydrothermal treatment for preparation of the zinc and boron co-doped carbon dots(ZnB-CDs),which exhibits yellow fluorescence(535 nm),from 2-aminophenylboronic acid hydrochloride and ZnCl2 as the precursors was presented,and the morphology and properties of the products were characterized.Based on the phenomenon that the surface defects of the ZnB-CDs are decreased by sulfite,a new fluorescence method for the determination of sulfite was established.Under the optimized conditions,the fluorescence intensity difference was proportional to the logarithm of sulfite concentration in the range of 4-160μmol/L with a limit of detection of 1.24μmol/L.The turn-on fluorescence sensing strategy was utilized to the determination of sulfite in tap water,granulated sugar and crystal sugar,with a recovery of 96.7%-107.2%.