Highly photoluminescent N-doped carbon quantum dots (N-CDs) which the quantum yield reached 63% were prepared through hydrothermal treatment. The obtained N-CDs displayed a uniform distribution of particle size, superior stability in high-salt conditions, and excellent sensitivity. A green fluorescence probe based on N-CDs was constructed for ultrasensitive determination of myricetin in vine tea on account of the static quenching. The N-CDs presented excellent linear fluorescence response in the concentration range of 0.2–40 μM and 56–112 μM and with a low detection limit of 56 nM. Additionally, the practicability of the probe was verified in spiked vine tea sample, and the satisfactory recoveries of myricetin varied from 98.8% to 101.2%, with relative standard deviations in the range of 1.52%-3.48%. It is the first time to employ N-CDs without any material modification as a fluorescence sensor to detect myricetin, which is a promising approach to expand the path for myricetin screening.

通过水热处理制备了量子产率达到63%的高光致发光N掺杂碳量子点（N -CDs）。获得的N -CDs 显示出均匀的粒径分布，在高盐条件下具有优异的稳定性和出色的灵敏度。基于静态猝灭构建了一种基于N -CDs 的绿色荧光探针，用于超灵敏测定藤茶中的杨梅素。N号-CD 在 0.2–40 μM 和 56–112 μM 的浓度范围内表现出出色的线性荧光响应，检测限低至 56 nM。此外，在加标藤茶样品中验证了该探针的实用性，杨梅素的回收率在98.8%至101.2%之间，相对标准偏差在1.52%-3.48%之间。这是首次使用未经任何材料修饰的N -CDs作为荧光传感器检测杨梅素，有望拓展杨梅​​素筛选途径。