基于 N、S 共掺杂碳点的荧光“开-关-开”传感器用于测定常见水果中的抗坏血酸。
N,S co-doped carbon dots based fluorescent "on-off-on" sensor for determination of ascorbic acid in common fruits.
机构信息
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi 712100, PR China; National Engineering Research Center of Agriculture Integration Test (Yangling), Yangling, Shaanxi 712100, PR China.
出版信息
Food Chem. 2018 Aug 30;258:214-221. doi: 10.1016/j.foodchem.2018.03.032. Epub 2018 Mar 9.
A switchable sensor based on N and S co-doped carbon dots (N,S-CDs) was developed to determine ascorbic acid (AA) content in common fruits via fluorescence quenching of N,S-CDs by Fe (off) and recovery by AA (on). TEM showed that the particle size was 2.35-7.95 nm with an average diameter of 5.12 nm. XPS and FTIR confirmed the presence of -OH, -COOH and -NH on N,S-CDs surface. UV-vis and FTIR revealed that the coordination of -COOH and -NH on N,S-CDs surface with Fe accounted for FL quenching, and the release of -NH from coordination complexes due to the reduction of Fe by AA led to partly FL recovery. The sensor allowed detecting AA in the linear range of 10-200 μmol/L with a LOD of 4.69 μmol/L. AA contents in common fruits detected by the sensor were in good agreement with the reference method (P > 0.05), indicating a practical fluorescent sensor for AA detection in common fruits.
基于 N 和 S 共掺杂碳点（N，S-CDs）的可切换传感器被开发出来，通过 N，S-CDs 被 Fe（off）荧光猝灭和 AA（on）恢复来测定常见水果中的抗坏血酸（AA）含量。TEM 显示粒径为 2.35-7.95nm，平均直径为 5.12nm。XPS 和 FTIR 证实 N，S-CDs 表面存在-OH、-COOH 和-NH。UV-vis 和 FTIR 表明，N，S-CDs 表面的-COOH 和-NH 与 Fe 的配位导致 FL 猝灭，而 AA 还原导致 Fe 释放出-NH 配位配合物，导致部分 FL 恢复。该传感器允许在 10-200μmol/L 的线性范围内检测 AA，LOD 为 4.69μmol/L。用该传感器检测的常见水果中的 AA 含量与参考方法一致（P＞0.05），表明该传感器是一种用于常见水果中 AA 检测的实用荧光传感器。
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