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色素蛋白的共振Raman和FT-Raman光谱李正强1卜凤泉2(1.吉林大学超分子结构与谱学开放实验室长春130021)(2.白求恩医科大学应用基础医学研究所长春130021)ResonanceRamanandFT-RamanofChromophor... 相似文献
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固态六羰基钼的FT┐拉曼光谱研究李淑玲(地矿部岩矿技术研究所北京100037)任玲(北京理工大学化学与材料学院北京100081)FT┐RamanSpectraofSolidMo(CO)6LiShuling(InstituteofRockandMine... 相似文献
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用SP-2558型光谱实验系统测得了天然竹红菌素粗品的三维荧光光谱,给出其随样品浓度变化的规律,进而利用软件和理论分析提出,天然竹红菌素粗品荧光光谱主要是竹红菌甲素(HA)和竹红菌乙素(HB)荧光光谱的贡献,HA的荧光光谱受其他成分影响较大,造成了短波峰的蓝移和长波峰的红移;HA与HB之间的辐射能量转移导致其荧光光谱中长波成分增加,从而形成较宽的谱段;由分子间氢键形成的多聚体会导致天然竹红菌素粗品溶液的发射峰随浓度的增加而红移,因而通过对天然竹红菌素粗品的浓度调控,可以在一定的范围内实现对发射光波段的调控,这对指导临床上的应用具有较高的参考价值。 相似文献
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为了探讨HypocrellinA (HA)与胺基衍生物反应的自由基形成机制 ,我们采用ESR谱分别研究了HA与二苄胺 (DBA)和N 甲基苄胺 (NMBA)的光化学反应 .在含胺类物质和溶解氧的溶剂系统下 ,可见光照射HA激发成HA ,然后将溶解氧转变成1O2 ,1O2 诱导DBA或NMBA的氯仿溶液都能产生半醌自由基和氮氧自由基 .氮氧自由基的信号强度随光照时间的增加而减弱 ,而半醌自由基的信号强度随光照时间的增加而增强 ,氮氧自由基的含量与光照产生的半醌自由基成反比 .在除氧条件下 ,光照含HA和DBA的氯仿溶液体系时 ,半醌自由基是主要的自由基 .结果表明 ,在有氧的氯仿溶液中 ,HA诱导胺类物质生成HA半醌自由基 相似文献
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Objective
The present study aims to investigate apoptosis of hepatocellular carcinoma cells induced by hypocrellin B-mediated sonodynamic action.Methods
The hypocrellin B concentration was kept constant at 2.5 μM and cells from the hepatocellular carcinoma HepG2 cell line were exposed to ultrasound with an intensity of 0.46 W/cm2 for 8 s. Cell cytotoxicity was quantified using an MTT assay 24 h after sonodynamic therapy (SDT) of hypocrellin B. Apoptosis was investigated using a flow cytometry with Annexin V-FITC and propidium iodine staining. Intracellular reactive oxygen species (ROS) levels were detected using a flow cytometry with 2,7-dichlorodihydrofluorecein diacetate (DCFH-DA) staining.Results
The cytotoxicity of hypocrellin B-mediated sonodynamic action on HepG2 cells was significantly higher than those of other treatments including ultrasound alone, hypocrellin B alone and sham treatment. Flow cytometry showed that hypocrellin B-induced sonodynamic action markedly enhanced the apoptotic rate of HepG2 cells. Increased ROS was observed in HepG2 cells after being treated with hypocrellin B-mediated sonodynamic action.Conclusions
Our data demonstrated that hypocrellin B-mediated sonodynamic action remarkably induced apoptosis of HepG2 cells, suggesting that apoptosis is an important mechanism of cell death induced by hypocrellin B-mediated SDT. 相似文献14.
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一种数字化高灵敏度荧光显微镜及其在竹红菌甲素研究中的应用 总被引:3,自引:1,他引:2
研制了一种可探测细胞微弱光图像的数字化高灵敏度荧光显微镜,采用视频数字化增强型CCD系统作为高灵敏度的接收系统,像增强器亮度增益为41,000,因而这种荧光显微镜可探测到普通荧光显微镜不能观察的微弱光图像,并可减少荧光物质的浓度和激发光的强度,减少对细胞自然生理环境的影响,数字化高灵敏度荧光显微镜在给出细胞微弱荧光图像的同时,并可给出图像上每一像元的发光强度和细胞平均发光强度,使用此仪器已首次直接 相似文献
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竹红菌素及其衍生物敏化的生物膜和DNA结构的光损伤的Raman光谱研究 总被引:8,自引:0,他引:8
本文综述了具有抗癌和抗艾滋病毒活性的三种光敏剂—竹红菌素及其衍生物敏化的生物大分子—生物膜和DNA结构的光损伤的Raman光谱特征;上述三种光敏剂对DNA和生物膜损伤最强的均为5-Br-HB,其次是HB,然后是HA,即5-Br-HB>HB>HA。说明药物的结构与它的光敏活性密切相关,修饰结构是增进药效的重要途径。 相似文献
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Paramaguru G Solomon RV Venuvanalingam P Renganathan R 《Journal of fluorescence》2011,21(5):1887-1895
The binding of Hypocrellin B-TiO2 chelate with DNA has been studied by using absorption, steady state fluorescence, cyclic voltammetry, time resolved fluorescence
and laser flash photolysis measurements. The experimental results show that the presence of TiO2 nanoparticles increases the binding of Hypocrellin B with DNA. The groove binding mode is confirmed by spectroscopic and
docking studies. Laser flash photolysis studies confirm the presence of electrons in the conduction band of TiO2 which will produce active oxygen species and results in damage of DNA indicating the potential application of Hypocrellin
B-TiO2 chelate in the field of photodynamic therapy (PDT). 相似文献
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