Anticancer drug Mitomycin C (MMC) quenches remarkably phosphorescence and reduces lifetime of phosphorescence probe, Pd-meso-tetrakis-(4-trimethylaminophenyl)porphin (Pd-TAPP), in the presence of calf thymus DNA. Thes...Anticancer drug Mitomycin C (MMC) quenches remarkably phosphorescence and reduces lifetime of phosphorescence probe, Pd-meso-tetrakis-(4-trimethylaminophenyl)porphin (Pd-TAPP), in the presence of calf thymus DNA. These results may be attributed to the site competition of MMC with the probe and electron transfer between MMC and probe. MMC also increases polarization degree of the probe by covalent drug-DNA or DNA-drug-DNA crosslinking.展开更多
The characteristics of absorption, fluorescence, room temperature phosphorescence(RTP) spectra of meso tetrakis(4 N trimethylaminobenzyl)porphin(TAPP) and Palladium porphyrin(Pd TAPP) probe in the presence and absence...The characteristics of absorption, fluorescence, room temperature phosphorescence(RTP) spectra of meso tetrakis(4 N trimethylaminobenzyl)porphin(TAPP) and Palladium porphyrin(Pd TAPP) probe in the presence and absence of ct DNA has been studied. Pd TAPP shows a very weak RTP emission in aqueous solution and strong RTP emission in the presence of DNA. Maximum RTP was observed at pH=7, with maximum excitation and emission wavelengths at 414 nm and 684 nm, respectively. RTP decay follows a first order exponential equation, RTP lifetime (τ) of probe is (0.72±0.03) ms. The detection limit of ct DNA may reach 8.8×10 -7 mol/L. The relative standard deviation(RSD) is less than ±6.6% in the linear range.展开更多
以Pb2+为离子微扰剂时,酚藏花红(PF)与异硫氰酸荧光素(FITC)均能在滤纸上分别发射强而稳定的室温磷光(RTP)信号;当两者混合时,发现PF和FITC的RTP信号均显著增强;而1.12 ag DNA spot-1均使PF和FITC的RTP信号剧烈增强,在634与659 nm处PF和...以Pb2+为离子微扰剂时,酚藏花红(PF)与异硫氰酸荧光素(FITC)均能在滤纸上分别发射强而稳定的室温磷光(RTP)信号;当两者混合时,发现PF和FITC的RTP信号均显著增强;而1.12 ag DNA spot-1均使PF和FITC的RTP信号剧烈增强,在634与659 nm处PF和FITC的ΔIp与DNA含量成线性关系,据此建立了FITC-PF双发光磷光探针测定蛋白质的新方法.该方法的检出限(LD)分别为14zg DNA spot–1(PF)和18zg DNA spot–1(FITC),灵敏度高,并成功用于花蜜样品中DNA含量的测定.同时探讨了FITC-PF双发光磷光探针测定痕量DNA的反应机理.展开更多
以水相合成的3-巯基丙酸包覆的Mn掺杂Zn S量子点(MPA-Mn/Zn S QDs)作为室温磷光探针,基于头孢哌酮钠舒巴坦钠(CPZ-SBT)作为一种电子受体,可通过电子转移有效猝灭Mn/Zn S QDs的室温磷光效应,构建了一种测定痕量CPZ-SBT的方法.当CPZ-...以水相合成的3-巯基丙酸包覆的Mn掺杂Zn S量子点(MPA-Mn/Zn S QDs)作为室温磷光探针,基于头孢哌酮钠舒巴坦钠(CPZ-SBT)作为一种电子受体,可通过电子转移有效猝灭Mn/Zn S QDs的室温磷光效应,构建了一种测定痕量CPZ-SBT的方法.当CPZ-SBT浓度为0.7~84μg/L时,其与MPA-Mn/Zn S QDs的磷光强度之间呈良好线性关系,相关系数为0.99,该方法的检出限为0.14μg/L.展开更多
A new cyclometalated iridium(Ⅲ) complex [Ir(2-pq)2(HPIP)]C1 (lrl, 2-pq=3-phenylisoquinoline, HPIP= 2-(2-hydroxyphenyl)imidazo[4,5-f] 1,10-phenanthroline) was synthesized and applied to image mitochondria in...A new cyclometalated iridium(Ⅲ) complex [Ir(2-pq)2(HPIP)]C1 (lrl, 2-pq=3-phenylisoquinoline, HPIP= 2-(2-hydroxyphenyl)imidazo[4,5-f] 1,10-phenanthroline) was synthesized and applied to image mitochondria in living cells. Irl displayed excellent ability to selectively accumulate in mitochondria of live cells with no requirement of replacement of the culture medium. Due to Irl exhibiting better photostability than the commercially available mitochondrial trackers, this complex could be applicable for the imaging and tracking of the mitochondrial mor- phological changes over long periods of time. In addition, in vitro cytotoxicity investigation revealed that it! showed negligible cytotoxicity at the concentrations employed. Based on these, Irl is suitable for organelle-selective imaging in living cells.展开更多
G-quadruplex(G4) is widely known as a non-classical secondary structure of nucleic acid. With the indepth study of G4, it is an urgent need for a phosphorescent probe with a high G4 binding ability to evaluate the lev...G-quadruplex(G4) is widely known as a non-classical secondary structure of nucleic acid. With the indepth study of G4, it is an urgent need for a phosphorescent probe with a high G4 binding ability to evaluate the level of G4 in the cytoplasm. Thus, this study designed and synthesized Ir-PDP where an Ir(Ⅲ)complex was used as a phosphorescent emitter. Meanwhile, two installed PDPs(pyridostatin derivatives)were used to improve the combination ability with G4 and reduced the cytotoxicity of the Ir(Ⅲ) complex.Compared with other nucleic acid secondary structures, Ir-PDP produced a higher phosphorescence lifetime after interacting with G4. Ir-PDP was distributed in the cytoplasm of living cells, and two-photon phosphorescence lifetime imaging can detect the binding events of the probe in the cytoplasm. The addition of G4 binder PDS significantly regulated cytoplasmic phosphorescence lifetime. The project explored a new sensing pathway to observe the binding manners of probes in the cytoplasm through the phosphorescence lifetime of probes.展开更多
Fluorescent analysis of bone provides valuable insights into bone structures.However,conventional dyes suffer from low specificity on bone tissue,small stokes shift,short fluorescent lifetime,and aggregation-caused qu...Fluorescent analysis of bone provides valuable insights into bone structures.However,conventional dyes suffer from low specificity on bone tissue,small stokes shift,short fluorescent lifetime,and aggregation-caused quenching effect,which result in low efficacy and artifacts.In this work,we design an aggregation-induced emission(AIE)-active iridium(III)complex(Ir-BP2)as a highly selective,convenient,nondestructiveness,and dual-mode staining agent for bone analysis.Ir-BP2 containing phosphonate groups selectively binds to hydroxyapatites,the main component of bone matrix,and exhibits turn-on AIE phosphorescence with prolonged lifetime.Ir-BP2 exhibits promising biosafety and offers higher accuracy in staining calcium deposits than conventional Alizarin Red S staining assay when it is employed in real-time monitoring of osteogenesis differentiation process.A ready-to-use staining spray of Ir-BP2 is fabricated.By using fluorescent imaging and lifetime imaging,Ir-BP2 staining provides valuable insights into bone microstructure analysis,microdamage diagnosis,and bone growth state identification.Further,Ir-BP2 is successfully applied on a human spine vertebra for diagnosing bone invasiveness of eosinophilic granuloma,validating its clinical practice.This work presents a powerful tool in bone analysis and will lead to new approaches for the diagnosis and treatment of bone-related diseases.展开更多
基金the National Natural Science Foundation of China (No. 29875016) Natural Science Foundation of Shanxi Province (No.991010) and the Ministry of State Education Foundation.
文摘Anticancer drug Mitomycin C (MMC) quenches remarkably phosphorescence and reduces lifetime of phosphorescence probe, Pd-meso-tetrakis-(4-trimethylaminophenyl)porphin (Pd-TAPP), in the presence of calf thymus DNA. These results may be attributed to the site competition of MMC with the probe and electron transfer between MMC and probe. MMC also increases polarization degree of the probe by covalent drug-DNA or DNA-drug-DNA crosslinking.
文摘The characteristics of absorption, fluorescence, room temperature phosphorescence(RTP) spectra of meso tetrakis(4 N trimethylaminobenzyl)porphin(TAPP) and Palladium porphyrin(Pd TAPP) probe in the presence and absence of ct DNA has been studied. Pd TAPP shows a very weak RTP emission in aqueous solution and strong RTP emission in the presence of DNA. Maximum RTP was observed at pH=7, with maximum excitation and emission wavelengths at 414 nm and 684 nm, respectively. RTP decay follows a first order exponential equation, RTP lifetime (τ) of probe is (0.72±0.03) ms. The detection limit of ct DNA may reach 8.8×10 -7 mol/L. The relative standard deviation(RSD) is less than ±6.6% in the linear range.
文摘以Pb2+为离子微扰剂时,酚藏花红(PF)与异硫氰酸荧光素(FITC)均能在滤纸上分别发射强而稳定的室温磷光(RTP)信号;当两者混合时,发现PF和FITC的RTP信号均显著增强;而1.12 ag DNA spot-1均使PF和FITC的RTP信号剧烈增强,在634与659 nm处PF和FITC的ΔIp与DNA含量成线性关系,据此建立了FITC-PF双发光磷光探针测定蛋白质的新方法.该方法的检出限(LD)分别为14zg DNA spot–1(PF)和18zg DNA spot–1(FITC),灵敏度高,并成功用于花蜜样品中DNA含量的测定.同时探讨了FITC-PF双发光磷光探针测定痕量DNA的反应机理.
文摘以水相合成的3-巯基丙酸包覆的Mn掺杂Zn S量子点(MPA-Mn/Zn S QDs)作为室温磷光探针,基于头孢哌酮钠舒巴坦钠(CPZ-SBT)作为一种电子受体,可通过电子转移有效猝灭Mn/Zn S QDs的室温磷光效应,构建了一种测定痕量CPZ-SBT的方法.当CPZ-SBT浓度为0.7~84μg/L时,其与MPA-Mn/Zn S QDs的磷光强度之间呈良好线性关系,相关系数为0.99,该方法的检出限为0.14μg/L.
文摘A new cyclometalated iridium(Ⅲ) complex [Ir(2-pq)2(HPIP)]C1 (lrl, 2-pq=3-phenylisoquinoline, HPIP= 2-(2-hydroxyphenyl)imidazo[4,5-f] 1,10-phenanthroline) was synthesized and applied to image mitochondria in living cells. Irl displayed excellent ability to selectively accumulate in mitochondria of live cells with no requirement of replacement of the culture medium. Due to Irl exhibiting better photostability than the commercially available mitochondrial trackers, this complex could be applicable for the imaging and tracking of the mitochondrial mor- phological changes over long periods of time. In addition, in vitro cytotoxicity investigation revealed that it! showed negligible cytotoxicity at the concentrations employed. Based on these, Irl is suitable for organelle-selective imaging in living cells.
基金supported by the National Natural Science Foundation of China (Nos. 92153303 and 21721005)。
文摘G-quadruplex(G4) is widely known as a non-classical secondary structure of nucleic acid. With the indepth study of G4, it is an urgent need for a phosphorescent probe with a high G4 binding ability to evaluate the level of G4 in the cytoplasm. Thus, this study designed and synthesized Ir-PDP where an Ir(Ⅲ)complex was used as a phosphorescent emitter. Meanwhile, two installed PDPs(pyridostatin derivatives)were used to improve the combination ability with G4 and reduced the cytotoxicity of the Ir(Ⅲ) complex.Compared with other nucleic acid secondary structures, Ir-PDP produced a higher phosphorescence lifetime after interacting with G4. Ir-PDP was distributed in the cytoplasm of living cells, and two-photon phosphorescence lifetime imaging can detect the binding events of the probe in the cytoplasm. The addition of G4 binder PDS significantly regulated cytoplasmic phosphorescence lifetime. The project explored a new sensing pathway to observe the binding manners of probes in the cytoplasm through the phosphorescence lifetime of probes.
基金National Natural Science Foundation of China,Grant/Award Number:22107087Yong Talent Support Plan of Xi’an Jiaotong University,Grant/Award Number:YX6J024+1 种基金Science and Technology Planning Project of Guangzhou,Grant/Award Number:202002030089Key Projects of Social Welfare and Basic Research of Zhongshan City,Grant/Award Number:2021B2007。
文摘Fluorescent analysis of bone provides valuable insights into bone structures.However,conventional dyes suffer from low specificity on bone tissue,small stokes shift,short fluorescent lifetime,and aggregation-caused quenching effect,which result in low efficacy and artifacts.In this work,we design an aggregation-induced emission(AIE)-active iridium(III)complex(Ir-BP2)as a highly selective,convenient,nondestructiveness,and dual-mode staining agent for bone analysis.Ir-BP2 containing phosphonate groups selectively binds to hydroxyapatites,the main component of bone matrix,and exhibits turn-on AIE phosphorescence with prolonged lifetime.Ir-BP2 exhibits promising biosafety and offers higher accuracy in staining calcium deposits than conventional Alizarin Red S staining assay when it is employed in real-time monitoring of osteogenesis differentiation process.A ready-to-use staining spray of Ir-BP2 is fabricated.By using fluorescent imaging and lifetime imaging,Ir-BP2 staining provides valuable insights into bone microstructure analysis,microdamage diagnosis,and bone growth state identification.Further,Ir-BP2 is successfully applied on a human spine vertebra for diagnosing bone invasiveness of eosinophilic granuloma,validating its clinical practice.This work presents a powerful tool in bone analysis and will lead to new approaches for the diagnosis and treatment of bone-related diseases.