effectively detect and monitor NTR in the living cells for the diagnosis of hypoxia in a tumor. Here, we synthesized a novel turn-on fluorescent probe NTR-NO2 based on a fused four-ring quinoxaline skeleton for NTR detection. The highly efficient probe can be easily synthesized. The probe NTR-NO2 showed satisfactory sensitivity and selectivity to NTR. Upon incubation with NTR, NTR-NO2 could successively undergo
                                    硝化还原酶(NTR)在缺氧条件下可能更活跃,这是多相实体瘤的显着特征。有效检测和监测活细胞中的NTR对于肿瘤缺氧的诊断具有重要意义。在这里,我们合成了一种基于融合四环
喹喔啉骨架的新型开启荧光探针NTR-NO 2用于 NTR 检测。高效探针可以很容易地合成。探针NTR-NO 2对NTR表现出令人满意的灵敏度和选择性。NTR-NO 2与 NTR 一起孵育后,可连续发生硝基还原反应,然后生成NTR-NH 2以及显着的荧光增强(30 倍)。此外,由于分子内电荷转移 (ICT) 过程,荧光
染料NTR-NH 2表现出较大的斯托克斯位移 (Δ λ = 111 nm)。因此,NTR-NO 2在响应 NTR 后显示出较宽的线性范围 (0–4.5 μg mL -1 ) 和低检测限 (LOD = 58 ng mL -1 )。此外,该探针被用于检测缺氧HeLa细胞内的内源性NTR。