TiO_2/还原氧化石墨烯纳米复合物的电致化学发光性能研究

采用水热法还原氧化石墨烯的同时与TiO_2纳米粒子复合,制备TiO_2/还原氧化石墨烯纳米复合物,并在玻碳电极表面成膜。研究了膜稳定剂、复合比例、电势扫描范围及检测液pH对TiO_2/还原氧化石墨烯纳米复合物膜电致化学发光性能的影响。结果表明,Nafion作为膜稳定剂时,TiO_2/还原氧化石墨烯纳米复合物(1 wt%)膜能产生强的电致化学发光,强度是TiO_2纳米粒子膜发光强度的8倍。并且,复合物膜的电致化学发光峰电势和起置电势均明显正移。复合物膜在pH8~10范围内具有强的电致化学发光。     

齐墩果酸电致化学发光行为的研究

本文发现了齐墩果酸在中性介质中有较强的电致化学发光行为 ,其电致化学发光强度受电化学参数和发光条件的影响。详细考察了各种影响因素 ,确立了最佳发光条件 ,即 +2 .0V电压 ,1.0mol/LKCl体系 ,H2 O2 浓度为 1.5×10 -3 mol/L。在这个条件下 ,齐墩果酸的电致化学发光强度与它的浓度在 4 .38× 10 7～ 4 .38× 10 -5mol/L范围内呈现良好的线性关系 ,检出限达到 2 .0× 10 -7mol/L ,从而提供了电致化学发光测定齐墩果酸含量的方法。     

Nafion掺杂多壁碳纳米管固定Ru（bpy）3^2＋的电致化学发光法检测壮观霉素的研究

利用Nafion掺杂多壁碳纳米管形成复合膜将Ru（bpy）32＋固定于玻碳电极表面形成Ru（bpy）32＋-N-C。基于壮观霉素对该电极电致化学发光信号的增强作用,建立了一种新的壮观霉素电致化学发光检测方法,方法的线性范围为1.0×10-5～2.0×10-4 mol.L-1,检测限为2.5×10-6 mol.L-1。该方法用于尿样中壮观霉素的测定,加标回收率在87.1%～120.2%之间。     

Nafion掺杂多壁碳纳米管固定Ru（bpy）32+的电致化学发光法检测壮观霉素的研究

利用Nafion掺杂多壁碳纳米管形成复合膜将Ru(bpy)32+固定于玻碳电极表面形成Ru(bpy)32+-N-C。基于壮观霉素对该电极电致化学发光信号的增强作用,建立了一种新的壮观霉素电致化学发光检测方法,方法的线性范围为1.0×10-5～2.0×10-4 mol.L-1,检测限为2.5×10-6 mol.L-1。该方法用于尿样中壮观霉素的测定,加标回收率在87.1%～120.2%之间。     

电致化学发光技术用于单细胞表面磷脂酰胆碱的分析

文章利用电致化学发光技术分析单细胞膜表面磷脂酰胆碱。在电极表面培养细胞,利用特定的磷脂酶D与细胞表面磷脂酰胆碱反应生成胆碱,然后胆碱再与胆碱氧化酶反应产生过氧化氢;在正电位下,鲁米诺作为发光试剂存在时诱导过氧化氢发光,通过对光强的检测,实现对单细胞表面磷脂酰胆碱的检测。     

齐墩果酸电致化学发光行为的研究

首次发现了齐墩果酸在中性介质中有较强的电致化学发光行为,其电致化学发光强度受电化学参数和发光条件的影响。详细考察了各种影响因素,确立了最佳发光条件,即+2.0V电压,1.0mol/lKCL体系,H2O2浓度为1.5×10-3mol/L。在这个条件下,齐墩果酸的电致化学发光强度与它的浓度在4.38×10-7￣4.38×10-5mol/L范围内呈现良好的线性关系,检出限达到2.0×10-7mol/L,从而提供了电致化学发光测定齐墩果酸含量的方法。     

高效率农残检测仪在福州问世

记者近日从福州大学化学化工学院获悉,该院将具有高灵敏度的现代电化学与毛细管电泳检测技术结合,研制出全球首台（套）加压毛细管电色谱-电致化学发光仪器，构建了具有自主知识产权的检测系统。     

联吡啶钌体系电致化学发光测定盐酸苯海索的研究

首次建立了以金电极为工作电极电致化学发光测定盐酸苯海索的方法,采用循环伏安法和电致化学发光法研究了盐酸苯海索-Ru(bpy)32+体系的电化学行为和电化学发光行为。结果表明,在pH值8.0的磷酸盐缓冲溶液中,扫描速率为0.10 V.s-1时,电致化学发光(ECL)强度值与盐酸苯海索浓度在2.00×10-7~1.00×10-4mol.L-1范围内呈良好线性关系,其线性回归方程为:I(Counts)=300.00×105c-120.71,方法检出限为1.00×10-8mol.L-1(s/n=3)。不同时段测定5.9184×10-5mol.L-1的盐酸苯海索片溶液4次,所测样品含量值的RSD为1.55%。对样品进行加标回收率实验,回收率为97.50%~104.00%。该方法具有较好的稳定性和灵敏度,样品处理简单快速,用于盐酸苯海索片的测定,效果良好。     

联吡啶钌体系电化学发光法测定盐酸曲马多的研究

盐酸曲马多是含苯环结构的叔胺类化合物,对联吡啶钌的电致化学发光具有显著的增强作用.本文采用循环伏安(CV)和电致化学发光(ECL)法,研究了该体系的电化学行为和电化学发光行为,首次将铅笔芯作为电极用于电致化学发光体系,建立了一种测定盐酸曲马多的电化学发光新方法.在0.1 mol/L的PBS(pH 8.50)缓冲溶液中,扫描速度为100mV/s时,该ECL的峰高与盐酸曲马多在3.0×10～5.0×10-8moL/L浓度范围内呈线性关系(r=0.999 4,n=14),其线性回归方程为,(counts)=33.802×106c 131.57,方法检出限为1.5 x 10-8 mol/L(S/N=3).连续测定2.0×10-5 mol/L的盐酸曲马多溶液10次,发光强度值的RSD为1.80%.对样品进行加标回收率试验,回收率为92.5%～101.4%.该方法具有较高的选择性和灵敏度,样品处理简单快速,用于盐酸曲马多片剂的测定,结果满意.     

毛细管电泳-电致化学发光法测定氢溴酸右美沙芬

基于氢溴酸右美沙芬增强联吡啶钌的电致化学发光信号,研究了采用毛细管电泳-电致化学发光法分离检测氢溴酸右美沙芬含量的新方法.利用未涂层石英毛细管44 cm×25 μm;分离缓冲溶液为10 mmo/L磷酸盐缓冲溶液(pH 7.5);分离电压15 kV;检测池中溶液为50 mmo/L磷酸盐缓冲溶液(pH 7.5)和5 mmo/L联吡啶钌.在200 s内可实现氢溴酸右美沙芬的分离检测,其线性范围为1.0×10-7～1.0×10-5mol/L,相关系数为O.999 3,检出下限为1.9×10-8mol/L.本法操作简便快速、灵敏度高、结果准确可靠,可用于氢溴酸右美沙芬口服液中氢溴酸右美沙芬的质量监测.     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料，介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比，介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序，对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.