纤维素-三(3,5-二甲基苯基氨基甲酸酯)对烯唑醇对映体的直接拆分

制备了纤维素-三(3，5-二甲基苯基氨基甲酸酯)手性固定相(CDMPC)，以正己烷为流动相，添加异丙醇为改性剂，在高效液相色谱上实现了对烯唑醇光学异构体的直接拆分，探讨了改性剂的含量及色谱柱长对拆分效果的影响，从而优化了拆分条件。试验结果显示，流动相中异丙醇含量的减少有利于对映体的拆分，但保留增强；长色谱柱也有利于对映体的分离。使用两色谱柱串连，当流动相中正己烷与异丙醇的比例为95：5时可达到最佳分离效果，分离因子为1．17。     

氟草烟异辛酯对映体的手性拆分

利用高效液相色谱手性固定相法对氟草烟异辛酯对映异构体进行了拆分研究。使用了正己烷和石油醚两种流动相体系,正己烷流动相条件下考察了多种极性改性剂及其含量,以及温度对手性拆分的影响。实验结果显示,以异丙醇为改性剂,在正己烷体系中的分离效果最好,室温下最大分离因子可达到1．2,温度降低有利于对映体的拆分。石油醚体系的分离效果不佳。     

三唑酮对映体的手性拆分研究

合成了纤维素—三(3，5-二甲基苯基氨基甲酸酯)(CDMPC)，涂敷于氨基丙烷化硅胶上制备成涂敷量15％的手性固定相。以正己烷-异丙醇为流动相，在高效液相色谱上实现了对三唑酮光学异构体的直接拆分，研究了流动相中异丙醇的比例对分离效果的影响，优化了色谱拆分条件。     

乙氧呋草黄对映体的手性拆分研究

进行了除草剂乙氧呋草黄对映体在自制的纤维素-三(3,5-二甲基苯基氨基甲酸酯)(CDMPC)高效液相色谱手性柱上的拆分研究。使用了两种流动相体系:正己烷-异丙醇;石油醚-异丙醇,并分别考察了流动相中加入的极性改性剂对手性拆分的影响。试验结果显示,乙氧呋草黄在两种流动相体系中都能得到最好的拆分,但正己烷体系优于石油醚体系,流动相中的极性改性剂的含量减少有利于手性拆分。在正己烷流动相条件下考察了柱长、温度对手性拆分的影响。对对映体的拆分机理进行了讨论。     

乙草胺对映体的手性识别

乙草胺对映异构体在纤维素衍生物手性固定相上得到了分离,分离系统为高效液相色谱,流动相为正己烷和石油醚,流动相中添加了乙醇、内醇、异丙醇和丁醇为极性改性剂,考察了各种改性剂及其含量对拆分的影响。在0℃～25℃范围内研究了温度对拆分的影响。试验结果显示,丙醇和丁醇在2％～15％含量范围内对乙草胺没有分离效果,乙醇和异丙醇有一定的分离效果。流动相中醇含量的减少及温度的降低有利于对映体的拆分,在异丙醇含量为2％,温度为0℃时有最佳的分离效果,分离因子为1.20。     

手性固定相高效液相色谱法拆分右旋苯醚氰菊酯对映体

建立了以多糖衍生物为手性固定相的高效液相色谱直接拆分右旋苯醚氰菊酯的方法。在正相液相色谱条件下,考察了流动相中醇类改性剂的种类和浓度、流速、柱温对右旋苯醚氰菊酯4个立体异构体分离效果的影响,同时利用热力学方法对右旋苯醚氰菊酯的立体异构体与固定相保留和分离的热力学机理进行了探讨。结果表明,采用纤维素-三-(3,5-二甲基苯基氨基甲酸酯)手性色谱柱,在流动相为正己烷∶异丙醇∶二氯甲烷=98∶1∶1(V/V),流速1.0 mL/min,柱温25℃的条件下,可以实现右旋苯醚氰菊酯4个立体异构体的基线分离。     

钙拮抗剂尼莫地平对映体在Chiralcel OJ柱上的拆分机理

采用高效液相色谱法(HPLC),在Chiralcel OJ手性柱上拆分尼莫地平.以正己烷-异丙醇为流动相,研究了异丙醇体积含量、流速及柱温对尼莫地平对映体拆分行为的影响.并结合溶质计量置换保留模型和热力学理论对尼莫地平的手性识别机理进行探讨.实验表明V(正己烷)∶V(异丙醇)=90∶10,流速0.6 mL/min,柱温...     

乳氟禾草灵对映体分离及手性拆分热力学研究

以正己烷-异丙醇为流动相,在直链淀粉-三[（S）-α-甲苯基氨基]甲酸酯涂敷型手性固定相上,对乳氟禾草灵R、S对映体进行分离,考察了流动相组成、柱温对其保留和分离的影响;对乳氟禾草灵对映体与固定相之间的保留和分离的热力学机理进行了讨论。实验结果表明,柱温为25℃、正己烷-异丙醇（体积比为90：10）为流动相、流速为0.6mL/min时乳氟禾草灵两对映体得到基线分离。分离温度在25℃～40℃内,两对映体的lnα与1/T呈线性关系,手性拆分过程受焓的控制。     

HPLC手性固定相法拆分手性药物中间体苄基缩水甘油醚

在 Chiralcel OD多糖类手性固定相上 ,以各种不同配比的正己烷 -异丙醇为洗脱剂 ,对苄基缩水甘油醚的外消旋体进行对映体拆分 ,考察了不同洗脱剂配比、柱温和流速对分离度和出峰时间的影响。结果表明 ,手性拆分因子随流动相中强极性组分浓度的增加和柱温的升高而降低 ,流速对拆分因子的影响较小 ,得到了拆分苄基缩水甘油醚的最佳色谱条件     

高效液相色谱法分离2-羟基-3-甲氧基-3,3-二苯基丙酸对映体

建立了重要医药中间体2-羟基-3-甲氧基-3,3-二苯基丙酸对映体的高效液相色谱分离方法。采用手性色谱柱在正相条件下直接拆分2-羟基-3-甲氧基-3,3-二苯基丙酸对映体,考察了固定相种类、流动相中异丙醇比例、柱温、流速等对2-羟基-3-甲氧基-3,3-二苯基丙酸对映体分离的影响。最终确定其拆分条件为:色谱柱为Chiralpak ID(250 mm×4.6 mm,5.0μm),流动相为正己烷-异丙醇-三氟乙酸(97∶3∶0.1,v/v/v),流速为1.0 mL/min,检测波长为220 nm,柱温为25℃;在此条件下2-羟基-3-甲氧基-3,3-二苯基丙酸对映体的分离度为2.3。R构型的检测限、定量限分别为0.5μg/mL,1.0μg/mL,其在1～100μg/mL内线性关系良好(r=0.999 6)。平均回收率为98.4%～104.5%,峰面积的相对标准偏差为1.5%。3批中间体样品中R构型杂质含量均在合格范围内。所建立的分析方法简单快速,重现性好,可用于(S)-2-羟基-3-甲氧基-3,3-二苯基丙酸的异构体检测。     

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.