HPLC法测定金银花茶电绿原酸含量研究

目的：建立金银花茶中绿原酸含量的测定方法。方法：色谱柱：Kromasil C18柱（250mm×416mm,5um）;流动相：乙腈-水-磷酸（13：87：0．4）流速：1．0mL·min^-1．检测波长：327nm;柱温：30℃。结果：绿原酸在8．8—44．0μg·mL^-1范围内线性关系良好,线性回归方程为Y=0．9...     

高效液相色谱分析法测定磷酸腺嘌呤含量

建立了测定磷酸腺嘌呤的高效液相色谱定量检测方法。色谱柱：C18,5μm,250×4．6mm（I．D．）;流动相组成：甲醇：水=20：80（体积比）;流速：1．0mL/min;柱温：30℃;检测波长：254nm;进样量：10．0μL。实验结果表明,磷酸腺嘌呤的线性方程为Y=62932X-208307,（r=0．99995）,检出限为0．2mg／mL,相对标准偏差为0．74％,平均回收率为99．03％。     

RP-HPLC法测定落叶松中二氢槲皮素的含量

采用反相高效液相色谱法测定落叶松中二氢槲皮素的含量。确定色谱条件为：色谱柱Hypersil ODS—C18（4．6mm×200mm,5μm）;流动相为V（甲酵）：V（水）：V（冰醋酸）=40：59：1;流速为1．0mL·min^-1;检测波长为288nm;柱温为28℃。在此条件下,二氢槲皮素与其它组分得到良好的分离。线性范围为0．02～0．2μg·μL^-1（r=0．9998）,精密度RSD为0．96％（n=5）,平均回收率为100．4％。     

反相高效液相色谱法测定化妆品中的3—O-乙基维生素C

采用反相高效液相色谱法测定化妆品中的3—O-乙基维生素C,色谱条件：SHIMADZU Shim-pack VP-C18ODS（150mm×4．6mm,5μm）色谱柱;C18ODS保护柱芯;流动相V（甲醇）：V（0．025mol/L KH2PO4）=20：80;流速：1．0mL/min;柱温：30℃;紫外检测器检测,检测池温度：40℃,波长：254nm。结果表明,在此条件下,3—O-乙基维生素C在0-100mg／L与相应的峰面积具有良好的线性关系（r=0．9992）,线性回归方程为A=31．1703ρ,回收率在97．75％-100．60％,方法精密度RSD约为2．6％（n=5）。     

HPLC法测定牙膏中银杏叶提取物总黄酮苷的含量

以槲皮素、山奈素和异鼠李素为指标,建立HPLC法测定牙膏中银杏叶提取物总黄酮苷的含量。采用Agilent ZORBAX Eclipse XDB-C18色谱柱（Analytical 4．6×250mm 5-Micron）;流动相为甲醇-0．4％磷酸（55／45,V/V）;流速为1．0mL／min;检测波长为360nm;柱温为40℃;进样量为20μL。结果表明,槲皮素、山奈素和异鼠李素浓度分别在2．1～21．0、1．8～18．0和0．42～4．2μg／mL范围内呈良好的线性关系,相关系数分别为：0．9999、0．9999和0．9998;槲皮素、山奈素和异鼠李素回收率分别为：97．7％、98．3％和97．6％。该方法简单、灵敏、准确,可用于牙膏中银杏叶提取物总黄酮苷含量的测定。     

高效液相色谱法测定氟康唑的含量

目的：测定氟康唑的含量;方法：采用HPLC法。色谱柱为Kromasil C18（4．6mm×250mm,5μm）、流动相为pH7．0磷酸盐缓冲液一甲醇（54：45）、检测波长260hm、柱温为室温,结果氟康唑（r=0．9998）在100-300μg／ml范围内线性关系良好,平均回收率为100．15％;结论：所建立的测定方法操作简便、准确、重现性良好。     

HPLC测定润滑油中的NMP

建立了一种分析NMP的高效液相色谱方法,色谱条件：色谱柱为VARIAN C18（250×4．6nm）,流动相为m（甲醇）：m（水）=40：60,流速1mL／min,柱温为室温,检测波长210nm。方法线性范围为0．0001％-0．01％,r=0．9996,检出限为0．002μg,RSD为0．10％,加标回收率为98．6％-100．7％。能够快速、精确测定润滑油精制工艺过程中NMP的含量。     

HPLC法测定妇科止血灵胶囊芍药苷的含量

建立妇科止血灵胶囊高效液相色谱法测定芍药苷的方法。色谱柱：DiamonsilCl8（4．6mm×250mm,5μm）。流动相：乙腈-0．1％磷酸溶液（14：86）。流速：1．0mL·min-1。检测波长：230nm。柱温：35℃。进样量：10μg。芍药苷在12．6-252．0μg／mL范围内呈良好线性关系,r=0．9997。平均加样回收率为98．37％,RSD=1．34％（n=5）。所建立的方法简便准确、灵敏度高,可作为妇科止血灵胶囊的质量控制方法。     

高效液相色谱法测定水体中的苯甲酰脲类杀虫剂残留量

建立了用高效液相色谱测定水体中6种苯甲酰脲类杀虫剂（除虫脲、灭幼脲、杀铃脲、氟铃腺、虱螨脲和氟苯脲）残留量的方法．水样采用液液萃取,以二氯甲烷为提取剂．色谱分析条件：Kromasil-100—5C18色谱柱（250mm×4．6mm,粒径5μm）,流动相V（甲醇）：V（水）=80：20,流速为1．0ml/Mmin,柱温为室温,紫外检测波长为260nm．杀虫剂的质量浓度在1．0～2μg/mL范围内与色谱峰面积的线性关系良好,相关系数R^2=0．9974～1．0000,检测限为0．09～0．26μg／mL．在蒸馏水和湖水中,6种杀虫剂3个添加浓度水平的平均回收率分别为79．62％～95．28％和75．03％～98．06％,相对标准偏差分别为0．94％～11．04％和0．60％～12．56％．该方法可用于环境水样中苯甲酰脲类杀虫剂的残留量检测分析．     

高效液相法色谱法测定猪殃殃中绿原酸含量

建立了猪殃殃中绿原酸含量的HPLC测定方法。色谱柱为Diamonsil C185μm（250 mm×4.6 mm）色谱柱;流动相为甲醇-0.04％磷酸（23：77）;检测波长为324 nm;流速为1 mL/min;进样量为20μL;柱温25℃。经方法学考察,该方法线性关系、精密度、重现性和稳定性好。可快速、准确用于猪殃殃中绿原酸的含量测定。     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

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.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009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、环氧树脂、不饱和聚酯树脂)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。     

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.