二氢卟吩P6酰胺衍生物在重水中对NADPH光氧化作用的敏化效应

报道二氢卟吩 P6酰胺衍生物 la～e在重水中对 NADPH光氧化作用的敏化效应。实验结果表明 ;la～ e在非细胞体系中的光敏化力均优于参比药物血卟啉衍生物 ( HPD) ,以 1c为最强 ;提示 1c可能是一种潜在的肿瘤光动力治疗敏化剂     

新型光敏剂四间羟基苯基二氢卟吩介导光动力治疗的研究进展

光动力疗法(PDT)是一种有前途的治疗肿瘤的新方法,而新型光敏剂m-THPC的低毒性、高效率使其成为有潜力的光动力药物,因此m-THPC-PDT在治疗肿瘤方面具有较高的研究价值。     

苯并吩噁嗪叶绿素衍生物的合成及其光动力抗肿瘤作用研究

为了发现高效的光动力药物.以焦脱镁叶绿酸a衍生物为母体,通过酰胺反应引入氨基苯并吩噁嗪盐酸盐,制得苯并吩噁嗪叶绿素衍生物(PTM);采用1 H NMR、MS对其结构进行表征;用紫外-可见光谱、荧光发射光谱对其光学性能进行表征;用DPBF法测定了单线态氧生成速率;用MTT法测定了化合物光动力抗肿瘤活性.该化合物的紫外-可...     

中药光敏剂介导的光动力疗法

光动力疗法是现代肿瘤治疗中的一种新方法。光敏剂的选择是肿瘤光动力治疗中的关键和核心问题。近年来研究发现 ,某些中草药如姜黄素、黄柏、补骨脂素等具有一定的光敏活性作用。基于中草药提取物中研制的高效、低毒的新型理想光敏剂介导的光动力治疗正倍受人们的普遍青睐     

二氢卟吩类光敏剂化单态氧光谱及其量子产率

建立了测量单态氧（^1O2)荧光光谱和量子产率的方法；定量测定了二氢卟吩类光敏剂CPD1和CPD2在有机溶剂中敏化^1O2的荧光光谱和量子产率 φCPD1=0.51、φcpd2=0.83；研究了CPD1和CPD2敏化^1O2的荧光光谱特性及其与溶剂，浓度和光照强度等外部条件的相关性；分析和阐述了提高光动力疗法（PDT）疗效的基本思路，并提供了部分理论和实验依据。结果表明：CPD2和CPD2具有较强的敏化^1O2的能力，是有前途的用于PDT的光敏剂；敏化^1O2是此类光敏剂在PDT中的主要机制；测定^1O2在1270nm的荧光光谱，是测定敏化^1O2量子产率的方便而可靠的方法。     

双光子激发二氢卟吩衍生物的光物理特性

用飞秒脉冲激光,研究了二氢卟吩光敏剂CPD3分子在双光子激发(TPE)下的光物理过程。报道了该分子在四氢呋喃(THF)溶剂中的TPE荧光光谱及其寿命,以及在波长800nm处的双光子吸收(TPA)截面,其中,TPE与单光子激发(OPE)的荧光光谱形状一致,具有相同的荧光发射带,荧光寿命分别为5.1ns和5.7ns;在波长800nm处的TPA截面σ2≈12.5×10-22cm4/GW。本文分析表明:在TPE下,该分子跃迁到激发态S2,经历了无辐射弛豫到达OPE的同一荧光能级,呈现激发Q带所产生的正常的荧光发射;该分子具有大的TPA截面是起源于该分子的刚性平面共轭结构所固有的线性吸收特性和TPA共振增强;CPD3作为光动力治疗(PDT)的光敏剂,又具有长波长的荧光发射、ns级的荧光寿命和大的TPA截面特性,这些双重特性使其有可能成为双光子荧光分子探针,借助于双光子荧光显微和成像技术,在分子水平上揭开PDT光敏药物与细胞器的结合特性和作用靶点等深层次问题。     

光动力增效研究进展

光动力疗法作为一种新兴的非侵入性治疗方法,由于其高度的选择性、良好的美容效果、可重复性以及低副作用,受到了越来越多的关注.虽然光动力疗法研究已经取得了很多进展,但是由于光敏剂的靶向问题、光的穿透性缺陷、肿瘤组织内缺氧环境等因素局限了光动力疗法的效果.近年来许多研究者对突破光动力的限制,增强其功效进行了研究.本综述主要从...     

光动力抗菌纳米制剂研究进展

新兴的光动力抗菌疗法是一种无创激发式治疗手段,主要利用近红外光作为光源,激活富集在病灶部位的光敏剂并产生活性氧自由基,最终实现对目标病菌的杀伤。近年来,随着生物材料与纳米医学技术的发展,小分子光敏剂纳米功能化后其生物兼容性和生物安全性得到优化,量子产率和病灶部位富集率显著提升,在抗菌治疗方面有很大的临床应用前景。本文结合小分子光敏剂纳米化策略方法实例,综述了纳米技术在光动力抗菌疗法的应用和发展。     

光动力疗法中最佳光动力治疗剂量的研究

为了研究光动力过程中光剂量和光敏剂剂量对光动力损伤效果的影响,基于肿瘤组织中光动力损伤剂量的数学模型以及光动力损伤剂量与组织中光剂量、光敏剂剂量、氧浓度之间的函数关系,用数学方法模拟研究了给定模型组织中光及光敏剂的有效吸收剂量与氧浓度之间的关系,并用ALA-PDT实验研究了k562细胞悬浮液中不同药物剂量对光动力损伤效果的影响.研究发现,光动力过程中光剂量与光敏剂浓度存在一个最佳治疗剂量,其大小和组织中氧浓度有关,组织中越缺氧,最佳光动力剂量越小,光动力过程对组织的损伤越小,通过实验发现k562细胞悬浮液中最佳剂量为20×0.25(J/cm2·mmol/L),此时光动力损伤效果最明显.研究结果表明了PDT对肿瘤组织具有选择性光动力损伤的特点,并为PDT在临床上的广泛应用提供了理论支持.     

光敏剂修饰寡核苷酸介导光动力疗法防治内膜增生的新策略

血管平滑肌细胞过度增殖及游移所致和血管内膜增生是术后血管再通的主要障碍。目前所有药物防治收效甚微，这促使人们寻求新的防治策略。本文拟通过光敏剂修饰反义寡核茬酸介导光动力疗法防治内膜增生，以期为临床防治术后血管再狭窄提供新的手段。     

Synthesis,characterization and in vitro photodynamic study of FA-TiO2 nanocomposite

In this paper, Folic acid (FA) modified TiO₂ nanocomposite (FA-TiO₂) was prepared by a facile adsorption-incubation method. The as-synthesized FA-TiO₂ was spherical with an average diameter of 20 nm. It was found that FA-TiO₂ exhibited excellent biocompatibility in FR(–) HepG-2 cells. In contrast, photodynamic FA-TiO₂ was more effective on killing FR(+) SGC-7901 cells, suggesting significant anticancer effects on FR(+) cells. The optimal photodynamic effect was obtained when modified proportion was 0.6 (FA:TiO₂), the amount of FA-TiO₂ was 150 μg/mL, and the illumination time was 30 min. Targeting studies indicated that FA-TiO₂ could be selectively transported into FR (+) SGC-7901 cells. Data from flow cytometry revealed that the cell cycle arrest and the mitochondrial membrane potential (MMP) collapse were the possible mechanisms involved in the photodynamic properties of FA-TiO₂. Overall, the results obtained may provide a new sight for anticancer treatment.     

Synthesis,characterization and photovoltaic performance of novel glass-forming perylenediimide derivatives

Novel glass-forming perylene-3,4,9,10-tetracarboxylic diimide (PDI) derivatives were synthesized from 1,7-dibromoperylene-3,4,9,10-tetracarboxylic diimides by nucleophilic substitution with a glass-forming mexylaminotriazine unit, characterized, and their performance as electron acceptors in bulk heterojunction photovoltaic cells with P3HT as donor were studied. Imide groups (octyl and 2,6-diisopropylphenyl) and bay substituents (bromo or pyrrolidinyl) were used to study the impact of sterics and electronics on device performance. The HOMO and LUMO levels of the materials were determined using cyclic voltammetry. The morphology and packing behavior of molecules in films of blends with P3HT were studied using Atomic Force Microscopy and X-ray diffraction, and in all four cases, the PDI derivatives remain in the amorphous phase, while the P3HT portion of the blends crystallizes. The devices gave photovoltaic performances ranging from 0.2 to 0.6%, and while the bay substituents showed negligible impact on device performance, switching from bulky 2,6-diisopropylphenyl imide groups to linear octyl chains improved the efficiency of the devices by 36%, current density by 66% and fill factor by 16%. The performances observed for devices incorporating these PDI glasses are comparable to that of devices with crystalline PDI acceptors.     

芳基取代蒽衍生物的合成及发光性能研究

为提高有机电致发光材料热稳定性和发光效率,设计合成了新型萘基蒽类蓝光材料。以9-溴-10-(2-萘基)蒽为原料,分别同4-(1-萘基)苯硼酸和4-(2-萘基)苯硼酸在四(三苯基膦)钯催化下进行Suzuki偶联,合成10-(2-萘基)-9-(4-(1-萘基)苯基)蒽(NPNA-1)和10-(2-萘基)-9-(4-(2-萘基)苯基)蒽(NPNA-2)。采用红外、核磁对其结构进行表征,通过TG、DSC分析对其热稳定性进行研究,采用紫外和荧光光谱对其光谱性能进行表征。在波长378nm波长光激发下,二者均显现出了强发光性能,NAPA-1的λ_(max)为424nm,NAPA-2的λ_(max)为428nm,均为优秀的蓝光材料。     

抗肿瘤新生血管形成与光动力学疗法

抗肿瘤血管形成已成为治疗肿瘤的一种新策略.光动力学疗法活化选择性潴留于肿瘤组织的光敏剂,产生单态氧物质,破坏肿瘤血管组织,最终导致肿瘤组织细胞的凋亡或坏死,为抗新生血管形成治疗肿瘤提供了一种新的手段.     

Synthesis and electroluminescent properties of highly efficient anthracene derivatives with bulky side groups

Three new asymmetric light emitting organic compounds were synthesized with diphenylamine or triphenylamine side groups; 10-(3,5-diphenylphenyl)-N,N-diphenylanthracen-9-amine (MADa), 4-(10-(3,5-diphenylphenyl)anthracen-9-yl)-N,N-diphenylaniline (MATa), and 4-(10-(3′,5′-diphenylbiphenyl-4-yl)anthracen-9-yl)-N,N-diphenylaniline (TATa). MATa and TATa had a PL_max at 463 nm in the blue region, and MADa had a PL_max at 498 nm. MADa and MATa had T_g values greater than 120 °C, and TATa had a T_g of 139 °C. EL devices containing the synthesized compounds were fabricated in the configuration: ITO/4,4′,4′′-tris(N-(2-naphthyl)-N-phenyl-amino)-triphenylamine (2-TNATA) (60 nm)/N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl)benzidine (NPB) (15 nm)/MADa or MATa or TATa or 9,10-di(2′-naphthyl)anthracene (MADN) (30 nm)/8-hydroxyquinoline aluminum (Alq₃) (30 nm)/LiF (1 nm)/Al (200 nm). The efficiency and color coordinate values (respectively) were 10.3 cd/A and (0.199, 0.152; bluish-green) for the MADa device, 4.67 cd/A and (0.151, 0.177) for the MATa device, and 6.07 cd/A and (0.149, 0.177) for the TATa device. The TATa device had a high external quantum efficiency (EQE) of 6.19%, and its luminance and power efficiencies and life-time were more than twice those of the MADN device.     

肿瘤的光动力疗法

综述了光动力疗法治疗肿瘤研究的发展过程 ,着重介绍了光动力治疗肿瘤的作用机制 ,并论述了今后的研究及发展方向。     

Synthesis,characterization, and transistor response of tetrathia-[7]-helicene precursors and derivatives

In this paper we report polycyclic, fully-conjugated, heteroaromatic compounds 1–5, two of them having a helical shape (tetrathia-[7]-helicenes 1 and 2), and explore their potential use as p-type semiconductors for organic thin-film transistors (OTFTs). Furthermore, we describe their optical absorption, emission, and electrochemical properties. In addition, the single crystal X-ray diffraction structure for compound 3 is reported. Thin films of all compounds were fabricated on several substrates at different temperatures by physical vapor deposition, and were characterized by optical spectroscopy, wide-angle X-ray diffraction, atomic force microscopy, and TFT measurements. The AFM images of compound 1 exhibit an interesting tubular morphology for films deposited at room temperature. This is the first observation of a compound with a helical shape leading to a nanowire-like morphology. In agreement with the molecular structure/morphology, only compound 4 is a p-type semiconductor with good carrier mobility.     

Synthesis and photo-electrochemical properties of novel thienopyrazine and quinoxaline derivatives,and their dye-sensitized solar cell performance

Light absorption from visible to NIR region is required to increase the photocurrent and to enhance the photo-energy conversion efficiencies in dye-sensitized solar cells (DSSCs). We have now developed novel thienopyrazine dye TP1 which has absorption up to 700 nm. Quinoxaline dye QX2 with absorption at shorter wavelengths than TP1 has been synthesized for comparisons. The power conversion efficiencies of DSSCs with TP1 and QX2 showed 4.4% and 3.2%, respectively. The absorption edge in IPCE of TP1 reached 800 nm and the open circuit voltage (Voc) of QX2 was high (0.77 V). To improve the device performances, QX2 was used as a co-adsorbent dye with TP1. In the mixed sensitizer based DSSC, a high power conversion efficiency of 6.2% was achieved due to the effective light harvesting and steric effect of QX2.     

普鲁卡因对光动力作用的影响

目的:1)体外观察光敏剂CPD5对人胰癌细胞(Hs766T)的光动力效果;2)观察普鲁卡因对CPD5光动力作用的影响.方法:浓度为1×105/ml的胰癌细胞,加到96孔培养板中,每孔100 μl,然后再加入不同浓度的CPD5,培养24 h弃旧液,更换新鲜培养液.普鲁卡因组加普鲁卡因,CPD5光动力对照组加生理盐水.670 nm半导体激光器,光剂量10 J/cm2,逐孔照射3 min.继续培养24 h后,用细胞排染试验测细胞存活率.结果:1)CPD5浓度为2.5μg/ml时,PDT后胰癌细胞存活率为2.0%;2)加入普鲁卡因(20 μg/ml)后,CPD5(浓度为2.5μg/ml)光动力效果是胰癌细胞存活率97.0%.结论:普鲁卡因可明显地淬灭CPD5光动力作用.