Although a few of fluorescent probes based on carbon dots (CDs) for vitamin B (VB) determination have been emerged, none of them can realize the detection of different kinds of VB. In this paper, nitrogen, chlorine co-doped dual-emission CDs (N, Cl-CDs) with emissions at 404 nm and 595 nm have been easily synthesized. VB, VB and VB can all induce obvious fluorescence turn-off response toward the N, Cl-CDs. Based on that, three types of VBs are quantitatively and sensitively evaluated in aqueous solution with wide concentration ranges of 14.9–135.0 μM, 34.7–89.8 μM and 29.8–79.8 μM, respectively. Importantly, visual semiquantitative detection of VBs on a test strip are also proposed. Moreover, the current N, Cl-CDs have been successfully applied to the detection of VBs in real samples. The N, Cl-CDs are sensitively multifunctional sensors for three kinds of VBs in aqueous solution and the visual semiquantitative detection by test paper assay is simple, portable and inexpensive.

中文翻译：

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荧光双发射碳点灵敏检测水溶液和试纸上的三种维生素B

尽管已经出现了一些基于碳点（CD）的用于维生素B（VB）测定的荧光探针，但它们都不能实现不同种类VB的检测。在本文中，很容易合成了发射波长为404 nm和595 nm的氮、氯共掺杂双发射CD（N，Cl-CD）。 VB、VB和VB均能对N、Cl-CDs产生明显的荧光关闭响应。在此基础上，分别在14.9-135.0 μM、34.7-89.8 μM和29.8-79.8 μM的宽浓度范围的水溶液中对三种类型的VB进行了定量和灵敏的评估。重要的是，还提出了对测试条上的 VB 进行视觉半定量检测。此外，目前N、Cl-CDs已成功应用于实际样品中VBs的检测。 N、Cl-CD是一种灵敏的多功能传感器，可检测水溶液中的三种VB，并且通过试纸测定进行视觉半定量检测，简单、便携且廉价。