基于虚拟现实技术的高效液相色谱教学课程建设

高效液相色法是一种用于分离分析的经典仪器,在众多领域都有广泛应用,并已成为仪器分析本科实验教学的重要内容。但由于高效液相色谱人均台数不足、教学成本较高且有安全隐患等原因,传统实验教学效率较低,而虚拟现实技术很好地弥补了这一局限性。本文针对高效液相色谱仪的教学特点,基于虚拟现实技术建设了高效液相色谱的实验课程,打破了现场教学的制约,降低了教学成本和安全风险,提高了教学内容的实用性,培养了学生自主学习的能力,为开放式实验教学打下坚实基础。     

色谱实验教学改革与实践 ——以"咖啡因含量测定"为例

传统液相色谱实验教学中存在着硬件设施不足、教学内容陈旧、课堂教学方法单一等问题.以"咖啡因含量测定"为例,围绕实验选题、实验预习、实验教学和实验考核进行教学改革与实践.新的教学模式能够激发学生的学习兴趣,提高学生实践能力,有利于培养应用型人才.     

固相萃取-高效液相色谱法测定藻液中甲磺隆的残留量

建立了固相萃取-高效液相色谱(SPE-HPLC)测定藻液中甲磺隆残留量的方法.实验确定了固相萃取方法,优化了萃取条件.高效液相色谱采用Eclipse XDB-C18(4.6 mm×150 mm,5μm)分离,以甲醇∶水(85∶15,体积比)为流动相,紫外检测波长为227 nm.该方法简便、快速、准确.实验结果表明甲磺隆具有良好的环境特性,将其用于治理"水华"、"赤潮"的急性爆发是可行的.     

策划药物MDPV的研究进展

针对目前出现较多的"浴盐"中的主要成分甲卡西酮类设计药物MDPV的理化性质、药理作用、代谢、检验方法等进行综述,着重介绍了该药物的薄层色谱法、气相色谱-质谱联用法、液相色谱法、液相色谱-质谱联用法等鉴定方法的操作、条件与结果等,为公安机关在该类药物的分析与鉴定方面提供一定的帮助。     

农药杀虫剂中未知物——氯虫苯甲酰胺的定性定量分析

建立了对农药杀虫剂中添加隐性成分氯虫苯甲酰胺进行液相色谱初筛,再用液相色谱–串联质谱仪进行定性,最后用液相色谱进行定量的方法。样品加入四氢呋喃和乙腈溶解,用DAD检测器和C18柱,以乙腈–缓冲溶液(V/V,45/55)为流动相,对氯虫苯甲酰胺初筛和定量,用液相色谱–串联质谱电喷雾正离子扫描定性。实验证明,该方法操作简单,准确度、精密度均良好。     

CEI环聚体的合成与表征

本文以间苯二甲酰氯和乙二醇为反应单体,采用"假高稀"法,经过试剂除水、合成、分离和除杂等过程,得到了间苯二甲酸乙二醇环聚体(CEI),并对其进行了液相色谱、凝胶渗透色谱和核磁共振分析表征。结果表明,实验合成的CEI环聚体以二聚体、三聚体和六聚体为主,含有较多的线聚体等杂质,需要进一步优化合成工艺及分离方法。     

高等院校高效液相色谱的管理与维护

高效液相色谱实验课是高等院校分析类教学的必修课之一,实验教学用到的高效液相色谱法是高等院校在科研和学生实验中常用的一种分析方法。本文通过高效液相色谱各部件的组成,提出了一些常见问题以及加强仪器应用以及日常管理与维护的措施,为高等院校精密贵重仪器的日常维持,提高使用率,降低维修率,延长使用寿命,以及教学和科研做好充分的后勤保障。     

实验室高效液相色谱安全使用及注意事项

高效液相色谱(HPLC)是一种通用分析和分离仪器,高效液相色谱法具有的高准确度和高精密度被广泛应用于药品、食品和环境样品的分析。高效液相色谱是实验室的必备之一,为了使高效液相色谱在教学和科研提高其使用效率、充分发挥其价值,加强高效液相色谱仪日常管理维护和常见故障处理是非常必要的。本文对高效液相色谱安全使用和主要组成模块及注意事项日常保养方法进行简明概述。     

杀螟松的反相液相色谱分析

高效液相色谱通常调节流动相的组成和柱温来改变色谱分离情况。本文对于反相键合相液相色谱,详细测定了流动相组成、柱温分别对农药杀螟松及其杂质的容量因子、分离因子、理论塔板数和分离度等全面的影响,并测定了有关的热力学参数,为选择色谱操作条件提供实验根据。一、实验 (一)仪器及实验条件仪器:美国Varian公司生产的VISTA56型液相色谱仪     

高效液相色谱法测定面膜中荧光增白剂CXT

建立了高效液相色谱测定面膜中可能添加荧光增白剂CXT的方法。试样用乙醇-水(体积比为1∶2)溶液做提取剂,30℃条件下超声提取20min;高效液相色谱条件,Agilent 300SB-C18色谱柱分离荧光增白剂CXT,流速0.8mL/min,流动相为乙腈/水,标准曲线线性关系0.998,检出限、精密度、定量限及加标回收率等方法学实验数据均符合要求,方法简单,重现性好。     

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.     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

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.     

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.     

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。     

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.