Rational N,P-Codoped pH-Activatable Red Carbon Dot for In Vitro and In Vivo Tumor Imaging

文献类型： 外文期刊

第一作者： Huang, Qiuyu

作者： Huang, Qiuyu;Huang, Zijie;Peng, Chuting;Zhou, Guohua;Li, Zhiguo;Jia, Yongmei;Liu, Peilian;Xue, Mingyue;Xiang, Xia

作者机构：

关键词： Carbon dots; tumor microenvironment; tumor imaging; diagnose; low pH

期刊名称：ACS APPLIED BIO MATERIALS （ 影响因子：4.7； 五年影响因子：4.6 ）

ISSN： 2576-6422

年卷期： 2023 年 6 卷 5 期

页码：

收录情况： SCI

摘要： Tumor detection and imaging via tumor microenvironmental indicators can have practical value. Here, a low-pH-responsive red carbon dot (CD) was prepared via a hydrothermal reaction for specific tumor imaging in vitro and in vivo. The probe responded to the acidic tumor microenvironment. The CDs are codoped by nitrogen and phosphorene and contain anilines on the surface. These anilines are efficient electron donors and modulate the pH response: Fluorescence is undetectable at common physical pH (>7.0), but red fluorescence (600-720 nm) increases with decreasing pH. The inactivation of fluorescence is due to three aspects: photoinduced electron transfer from anilines, deprotonation-induced energy states changing, and particle aggregation-induced quenching. It is believed that this pH-responsive character of CD is better than other reported CDs. Thus, in vitro images of HeLa cells show strong fluorescence that is 4-fold higher than normal cells. Subsequently, the CDs are used for in vivo imaging of tumors in mice. Tumors can be clearly observed within 1 h, and clearance of CDs will be finished within 24 h due to the small size of the CDs. The CDs offer excellent tumor-to-normal tissue (T/N) ratios and have great potential for biomedical research and disease diagnosis.

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