高效捕获阪崎肠杆菌免疫磁珠的制备研究

制备以链霉亲和素——生物素介导偶联的免疫磁珠,通过偶联条件和捕获条件的优化,建立高效、特异富集阪崎肠杆菌的方法。结果表明,按照100μg SA/mg磁珠制备链霉亲和素磁珠,以抗体与磁珠表面链霉亲和素物质的量比为3∶1,37℃偶联30 min,可获得抗体结合量为386.6μg/mg免疫磁珠。在1 mL体系中添加粒径为80 nm的链霉亲和素免疫磁珠0.3 mg室温孵育30 min,纯培养条件下对阪崎肠杆菌捕获效率在80.5%以上,人工污染样品条件下捕获效率可达61.1%以上,非特异性低于5.0%。该免疫磁珠为富集阪崎肠杆菌提供了一种操作简单、捕获效率高、特异性好的方法,可广泛应用于食品中阪崎肠杆菌的检测。     

N,N′-双-β-萘甲基哌嗪分子内激发态复合物形成的混合溶剂效应

本文测定了N,N′-双-β-萘甲基哌嗪(DMNP)在苯与乙腈混合溶剂中的荧光光谱。在乙腈含量<5(mol·dm~(-3))时,乙腈猝灭DMNP苯溶液的荧光符合Stern-Volmer方程,表明极性溶剂分子乙腈与DMNP分子内激基复合物存在着相互作用。随着乙腈含量的增加,DMNP分子内激基复合物(exci-plex)荧光的猝灭与红移以及分子内激基缔合物(excimer)的逐步形成则仅与体系的极性有关。文中还讨论了DMNP激发态复合物形成的机理。     

竹红菌甲素和吲哚类化合物的相互作用

本文利用吸收光谱,荧光光谱研究了竹红菌甲素(以下简称HA)和吲哚类化合物的相互作用。发现HA和吲哚类化合物在一定条件下可形成复合物。这种复合物带有电荷转移性质。吲哚环上带有给电子取代基,位阻小,溶剂的极性大和溶液呈中性有利于该复合物的形成。     

3-氯-N-正丁基-N-[(4-甲氧基-6-二甲氨基-1,3,5-三嗪基-2-)氨基甲酰基]苯磺酰胺的合成

本文报道了磺酰脲类化合物3-氯-N-正丁基-N-[(4-甲氧基-6-二甲氨基-1,3,5-三嗪基-2-)氨基甲酰基]苯磺酰胺的合成方法、分析测试数据及其室内生测结果,表明该化合物具有很高的除草活性。     

1-(4’-磺基苯基)-3-甲基-5-吡唑啉酮的合成及应用

文章简介了由双乙烯酮衍生的1-(4’-磺基苯基)-3-甲基-5-吡唑啉酮的合成工艺。全面系统的介绍了1-(4’-磺基苯基)-3-甲基-5-吡唑啉酮作为偶合组分和一些芳胺或取代芳胺化合物的重氮物进行偶合反应,可以制备许多品种的酸性染料、活性染料和媒介染料。这些品种的染料可分别用于羊毛、丝绸、锦纶、黏胶、棉等纤维和织物上,在纺织印染工业上有着广泛的应用。列出了这些品种的商品名称、化学结构式、CAS登录号、欧共体登记号、合成反应流程的方框示意图以及用途和国内主要生产企业。     

5(6)-羧基罗丹明110的合成工艺

研究了反应时间、升温方式、氮气保护等合成条件对5 (6)-羧基罗丹明110合成反应的影响,并利用基质辅助激光解吸电离飞行时间质谱对5 (6)-羧基罗丹明110的合成反应进行了检测。通过实验确定了较为适宜的合成条件：在氮气保护下80℃反应1 h,然后在30 min内匀速升温至180℃再反应6 h。在此条件下反应基本完全,磺化物较少,且可以通过重结晶除去。产率可达93％。     

替换氧桥原子的罗丹明类似物的合成及应用

罗丹明类化合物是一类重要的荧光探针染料,近年已被广泛地应用到生命科学、化学、诊断医学等学科中.目前文献报道了罗丹明类化合物的多种修饰方法,主要对通过替换桥原子氧得到罗丹明类似物这一修饰方法进行综述,重点介绍了该类罗丹明类似物的合成及应用.     

柱前衍生法在5(6)-羧基罗丹明异构体分离中的应用

利用柱前衍生法对5(6)-羧基-2',7'-二甲基罗丹明6G混合物进行了分离,通过~1HNMR、~(13)CNMR和元素分析对两种异构体的结构进行了表征。荧光光谱测试显示,两种异构体的最大发射波长相差11 nm。该方法操作简单,收率高,纯度好,适用于分离极性较大的5(6)-羧基罗丹明混合物。     

2-(N-苯磺酰基吲哚-3-基)-3-N-酰基-5-苯基-1,3,4-噁唑啉类化合物抑菌活性研究

为了研究2-(N-苯磺酰基吲哚-3-基)-3-N-酰基-5-苯基-1,3,4-噁唑啉类化合物中具有潜在应用价值的抑菌先导化合物。在0.1 g/L质量浓度下,采用菌丝生长速率法测定了14种2-(N-苯磺酰基吲哚-3-基)-3-N-酰基-5-苯基-1,3,4-唑啉类化合物对小麦赤霉病菌、白菜黑斑病菌、棉花枯萎病菌、水稻稻瘟病菌和烟草赤星病菌的室内抑菌活性。结果表明,化合物1~化合物14对所测5种植物病原菌均表现出不同程度的抑菌活性,其中化合物9和化合物14对小麦赤霉病菌、白菜黑斑病菌、棉花枯萎病菌、水稻稻瘟病菌和烟草赤星病菌5种植物病原菌活性较好,其抑制率分别为15.69%~31.08%和16.28%~29.41%,表现出一定的广谱抑菌活性。初步拟定将这2个化合物作为进一步衍生修饰的先导化合物。     

2—羟基—3—羧基—5—磺基偶氮胂的合成及光度法测定钍的研究

研究了 2 -羟基 - 3-羧基 - 5 -磺基偶氮胂的合成及光度法测定钍的方法。在 1 .2 mol/L硝酸介质中 ,钍与 2 -羟基 -3-羧基 - 5 -磺基偶氮胂形成 1∶ 2的绿色配合物 ,最大吸收波长在 6 75 nm处 ,摩尔吸光系数为 8.5 4× 1 0 4 L· mol- 1·cm- 1 。钍含量在 0～ 30 μg/2 5 m L范围内符合比耳定律。应用于特种镁合金中钍的直接测定 ,结果非常满意。     

由4-氨基二苯醚合成三苯二噁嗪荧光染料

以4-氨基二苯醚为原料合成了10个新结构三苯二口恶嗪型荧光染料,测定了它们在甲苯、氯仿、DMF、丙酮和乙醇中的吸收光谱和荧光光谱。结果表明,这些染料发色强度大(εm ax>7×104),荧光强度高(在甲苯中Ф=0.43~0.78),染料的摩尔消光系数、荧光量子产率和Stokes位移与溶剂极性参数ET之间呈线性变化关系。     

适用于纺织荧光染色的染料及其应用研究进展

荧光染料凭借发射强度高、色彩鲜艳、荧光强烈等特点，在纺织领域吸引了许多染料专家们的目光，是一类非常具有应用前景的功能性染料。该文按染料结构分类的方式综述了从上世纪至今商品化分散、酸性和活性荧光染料以及新型1, 8-萘酰亚胺类、香豆素类、半花菁类和其它类新型荧光染料及其衍生物在纺织染色领域的研究进展，最后提出适用于纺织荧光染色的染料在纺织领域未来的发展趋势。     

Fluorescence from fluorescent dye based polyurethane ionomer(III)

A series of reactive fluorescent dyes were successfully synthesized and their structure was proven by IR spectra, NMR spectra, elemental analysis, and mass spectra. The fluorescence performance 6‐amino‐2(‐3‐phenyl‐propyl)‐benzo[de]isoquinoline‐1,3‐dione and 2‐benzyl‐6‐hydroxy‐benzo[de]isoquinoline‐1,3‐dione appears at around 276 and 437.4 nm, respectively, and their quantum yields are 0.662 and 0.562, respectively. It is important to indicate that the fluorescence performance is better for 6‐amino‐2(‐3‐phenyl‐propyl)‐benzo[de]isoquinoline‐1,3‐dione than for as a result of more electron donating groups linked to the 6‐amino‐2(‐3‐phenyl‐propyl)‐benzo[de]isoquinoline‐1,3‐dione molecule. These fluorescent dyes further react with toluene diisocyanate and other additives to form fluorescent dye based polyurethane (PU) ionomer molecules, and their structures are demonstracted by IR spectra. In aqueous solution, the fluorescence performance appears to be better for 6‐amino‐2(‐3‐phenyl‐propyl)‐benzo[de]isoquinoline‐1,3‐dione based PU ionomer than for 6‐amino‐2‐phenyl‐ethyl‐benzo[de]isoquinoline‐1,3‐dione based PU ionomer. For the fluorescent dye based PU ionomer molecule system, the number‐average particle sizes of the fluorescent dye based PU ionomer molecules in water increase with increasing concentration of the fluorescent dye, as a result of the increased free volume of the ionomer molecule. This may be the result of increased intermolecular interactions between ionomer– molecules themselves. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 455–465, 2005     

层状蛭石有机荧光染料组装超薄膜

基于有机荧光染料的固体团聚或者堆叠导致荧光猝灭、发光和稳定性减弱，采用剥离与超分子组装的方法，制备固体荧光超薄膜发光体。首先通过剪切剥离制备蛭石纳米片，控制其粒径分布在30~300 nm，再通过与有机荧光染料（罗丹明6G和罗丹明B）层层超分子组装的方法，获得蛭石有机无机荧光薄膜。经对比实验发现，不添加蛭石纳米片，无法获得均匀发光的荧光薄膜。蛭石有机无机荧光薄膜的SEM显示，有机荧光染料和蛭石分布均匀，克服有机荧光染料团聚或者堆叠的荧光猝灭，实现荧光亮度可控。     

荧光染料用于涤纶织物染色的荧光性能研究

在实验条件下，染色织物的荧光反射率随荧光染料的浓度增加而增加，超过一定浓度后，有下降趋势；在pH=5左右，荧光反射率最高；荧光增白剂会提高染色织物的荧光反射率，在荧光黄2GFL中，当荧光增白剂的浓度由0.1％增加到5％时，荧光反射率由8．43增加至18．59，而对非荧光染料只有增艳的作用，不产生荧光。荧光染料染色织物的荧光反射率随着加入非荧光染料量的增加而减弱。     

The role of vinylsulphonyl reactive dyes in prevention of wool damage

Reactive dyes of the vinylsulphone and α-bromoacrylamido types inhibit wool fibre degradation during dyeing. The effect is proportional to the amount of dye applied, which may be explained in terms of set inhibition and modification of the cell membrane complex. Reactive dyes are capable of interfering with the fibre thiol-disulphide interchange reactions, as evidenced by a study of model thiol derivatives of vinylsulphone dyes. H.p.l.c. has been widely employed to separate and assist with identification of these thiol adducts. The role of the cell membrane complex has been clarified using reactive vinylsulphone fluorescent compounds as dye models and following fibre penetration using fluorescence microscopy.     

Influence of Label and Charge Density on the Association of the Therapeutic Monoclonal Antibodies Trastuzumab and Cetuximab Conjugated to Anionic Fluorophores

The design of bright and functional dye–protein conjugates requires hydrophilic and stable fluorophores with high molar absorption coefficients and high fluorescence quantum yields, which must not be prone to dimerization, as well as conservation of protein function and suppression of protein association. Although many synthetic dyes meet these needs, the influence of dye charge on bioconjugate performance is commonly neglected. This encouraged us to assess the spectroscopic properties, antibody functionality, binding behavior, folding, and association of conjugates of the therapeutic antibodies trastuzumab and cetuximab with the red cyanine dyes S0586, S2381, and 6SIDCC (bearing two, three, and six sulfonate groups, respectively). Our results demonstrate a negligible effect of dye labeling on antibody folding, yet a strong influence of label charge and density on antibody isoelectric points and association. Especially 6SIDCC decreased strongly the isoelectric points of both antibodies and their heavy or light chains even at low labeling degrees, thus favoring protein association. Although an increasingly negative dye charge reduces antigen affinity as shown in a competitive immunoassay, all conjugates still bound to cells overexpressing the target of the respective antibody. Obviously, dyes that cause minimum dimerization with a small number of charged groups are best for conjugate brightness, minimum protein association, and strong target binding. This underlines the need to consider dye charge for the rational design of conjugates with optimum performance.     

Water-soluble BODIPY and aza-BODIPY dyes: synthetic progress and applications

In recent years, boron-dipyrromethene (BODIPY) and boron-azadipyrromethene (aza-BODIPY) dyes have attracted considerable multidisciplinary attention due to their diverse applications. By introducing various hydrophilic groups, such as quaternary ammonium, sulfonate or oligo-ethyleneglycol moieties into the BODIPY core, the solubilities of these dyes in aqueous solution can be greatly improved while maintaining their high fluorescence quantum yields. Accordingly, applying these fluorescent dyes in aqueous systems to areas such as chemosensors, biomacromolecule labeling, bio-imaging and photodynamic therapy has been achieved. In this article, the recent progress on the synthesis, optical properties and application of water-soluble BODIPY dyes and aza-BODIPY dyes is reviewed.     

Green-Emitting Rhodamine Dyes for Vital Labeling of Cell Organelles Using STED Super-Resolution Microscopy

Fluorescence microscopy reveals the localization, spatial distribution, and temporal dynamics of the specifically labeled organelles in living cells. Labeling with exogenous conjugates prepared from fluorescent dyes and small molecules (ligands) is an attractive alternative to the use of fluorescent proteins, but proved to be challenging due to insufficient cell-permeability of the probes, unspecific staining, or low dye brightness. We evaluated four green-emitting rhodamine dyes and their conjugates intended for the specific labeling of lysosomes, mitochondria, tubulin, and actin in living cells. The imaging performance of the probes in living human fibroblasts has been studied by using confocal and stimulated emission depletion (STED) super-resolution microscopy with a commercial 595 nm STED laser. Two bright and photostable dyes (LIVE 510 and LIVE 515) provide specific and versatile staining.     

Fluorescence and photoisomerization of two stilbene-based dyes

The effect of solvent on the fluorescence and direct trans-cis photoisomerization of two stilbene-based fluorescent whitening agents has been investigated. With increasing solvent polarity there is an increase in the rate of photoisomerization resulting in reduced fluorescence quantum yields. This solvent polarity dependence is particularly marked for the bis(triazinylamino) stilbene dye and the results are discussed with reference to previous studies on model compounds. A comparison is made between the fluorescence lifetimes determined for the dyes in solution, embedded in poly(vinyl alcohol) film and adsorbed onto wool fabric. Fluorescence lifetimes of the dyes on wool fabric are shorter than expected and possible explanations for this observation are presented.