Hydrogen peroxide is a biologically important reactive oxygen species (ROS) and plays crucial roles in living organisms. Herein, a FRET-based ratiometric fluorescent probe has been developed for detecting H2O2in vitro and in vivo. In this nanoprobe, carbon dots serve as the energy donor and carrier for the H2O2 recognition element. This nanoprobe exhibits fast-response, low toxicity, high sensitivity (with a detection limit of 0.5 μM) and selectivity towards H2O2 over other reactive oxygen or nitrogen species. The nanoprobe has been successfully applied in the detection of H2O2 in live cells and in zebrafish larvae. By incubating the nanoprobe with zebrafishes, the nanoprobe can be absorbed by the fishes within 1 h and accumulates mainly in the abdominal region. Due to its small size (∼4 nm), the nanoprobe is gradually excreted by zebrafishes without long-term accumulation. Moreover, as the first ratiometric chemoprobe that can detect H2O2in vivo, the nanoprobe has been found capable of detecting and locating endogenous H2O2 in zebrafishes as a result of drug-induced oxidative damage. The successful detection of H2O2 by the nanoprobe in vivo may support its eventual use in clinical applications.
过氧化氢是一种
生物学上重要的反应氧种(ROS),在
生物体中发挥着重要作用。在此,我们开发了一种基于FRET的比率荧光探针,用于检测体内和体外的
H2O2。在这个纳米探针中,碳量子点作为能量供体和 识别元件的载体。该纳米探针具有快速响应、低毒性、高灵敏度(检测限为0.5 μM)以及对 相对于其他反应性氧或氮物种的选择性。该纳米探针已成功应用于活细胞和斑马鱼幼体中 的检测。通过与斑马鱼孵育,该纳米探针可在1小时内被鱼体吸收,并主要积累在腹部区域。由于其小尺寸(约4 nm),纳米探针逐渐被斑马鱼排出,没有长期积累。此外,作为第一种能够在体内检测 的比率
化学探针,该纳米探针已被发现能检测并定位因药物引起的氧化损伤而产生的内源性 。在体内成功检测 可能支持其未来在临床应用中的使用。