血中非那西丁的GC/MS检测

建立了非那西丁的气相色谱/质谱/质谱(GC/MS/MS)联用检测血中去痛片的主要代谢物非那西丁的新方法。采用液液提取法,用乙醚提取血中非那西丁,提取物水浴浓缩后进行GC/MS和GC/MS/MS分析,检测总离子流色谱(TIC)和一级质谱,并以非那西丁一级质谱基峰为母离子的测定其二级质谱,体内药物用GC/MS全扫描定性分析即用二级质谱结合其总离子流色谱峰的保留时间定性;选择离子扫描定量分析,采用内标曲线法,根据非那西丁和内标SKF525A二级质谱的TIC峰面积比进行定量分析。     

气相色谱/质谱联用测定硫化胶中的防老剂含量

采用气相色谱/质谱联用(GC/MS)测定硫化胶中的不同种类防老剂含量.结果表明,硫化胶经丙酮抽提后,用GC/MS进行分析,防老剂RD,4010NA,4020和3100的溶液质量浓度与特征离子峰面积呈良好的线性关系,定量分析结果较准确,操作简便.     

气相色谱-质谱法测定纺织品中的二辛基锡

构建了气相色谱-质谱(GC-MS)测定纺织品中二辛基锡的方法。应用液液萃取法提取纺织品中的二辛基锡,通过四乙基硼化钠衍生后,使用用GC-MS总离子流图和选择离子进行定性检测,使用选择离子的质谱峰进行定量测定。该方法样品前处理简单,使用外标标准曲线法对二辛基锡检测,在0.3～2.0μg/mL范围内呈良好的线性关系,加标回收率在93.1%～102.4%之间,可应用于纺织品中有机锡的检测。     

TG-IR-GC/MS联用技术测定聚合物中的红磷阻燃剂含量

利用热重-红外-气相色谱/质谱(TG-IR-GC/MS)联用技术对聚合物中红磷阻燃剂实现快速定性、定量分析。对于未知样品先用TG-IR-GC/MS联用在线分析模式实时对裂解气体进行分析,根据TG裂解温度点、IR实时扫描红外谱图及GC/MS质谱图对样品进行初步定性;结合定性分析的温度点对样品采用TG-IR-GC/MS联用分离分析模式,抽取该温度点裂解气进入GC/MS扫描红磷系列离子质荷比(m/z)分别为62、93、124,提取m/z为124的离子对样品进行定量分析。结果表明:PA6样品中红磷含量的平均值为35 695 mg/kg,仅比参考值高695 mg/kg,相对误差为2.0%,相对标准偏差(RSD)为11.7%,说明该技术具有较好的准确度和精确度,能很好地应用于测试聚合物中甚至其他形态下的红磷。     

气相色谱/质谱联用分析橡胶制品喷霜析出物

用气相色谱/质谱联用(GC/MS)对汽车门窗密封条、橡胶手套、白胶板、轮胎等喷霜析出物进行分析。从GC/MS总离子流色谱分析得出,橡胶制品喷霜析出物主要为防焦剂、促进剂、防老剂、防护蜡和硬脂酸等。GC/MS分离效果好,测试效率高,可以较准确地分析橡胶制品的喷霜析出物。     

顶空气相色谱/质谱法测定香精香科中丁二酮

采用气相色谱-质谱(GC-MS)分析技术,选择离子检测法(SIM),建立了香精香料中丁二酮的测定方法。色谱柱为DB-1 MS石英毛细管柱,电子轰击离子源,选择质谱图中的m/z 43和862个特征离子用于SIM检测,根据这2个离子的抽出离子色谱图的峰面积比进行目标物确证,以基峰m/z 86作定量分析,检出限为0.1 mg/kg。用色谱保留时间、质谱特征离子同时定性,消除了香精样品中复杂基体的干扰,避免了假阳性结果的出现。     

尿中甲基苯丙胺气相色谱/质谱分析

目的:建立尿中甲基苯丙胺的气相色谱/质谱(GC/MS)定性,定量分析方法,比较液-液提取和固相萃取两种方法。结果:尿中甲基苯丙胺液-液提取的回收率约82.3%;固相萃取方法回收率为91.3%。结论:尿中甲基苯丙胺提取采用固相萃取的方法比液-液提取效果好,方法简便、灵敏,适用于甲基苯丙胺中毒与滥用案件的定性定量分析,满足实际办案的需要。     

UPLC-ESI-MS/MS法快速测定烟草中几种潜香物质

使用超高效液相色谱-电喷雾串联四级杆质谱(UPLC-ESI-MS/MS)在多反应离子监测(MRM)模式下分离鉴定了烟草中7种潜香物质。烟样经甲醇提取,XAD-2柱分离纯化,选择中性丢失162扫描确定母离子,通过对母离子二级质谱扫描(MS2),并根据193、179、163、134.7、133等特征碎片离子峰分析结果确定了7种潜香型物质,分别为熊果苷、香豆酸-葡萄糖苷、香豆素奎尼酸、绿原酸、隐绿原酸、葡萄糖基阿魏酸、3-氧化紫罗兰醇葡萄糖苷。最后以苯酚-β-D-吡喃葡萄苷为内标,测定了烟叶不同部位的7种潜香型物质的相对含量。该方法快速、简便,适合于不同烟叶中潜香型物质的分析研究。     

吹扫捕集-GC-MS法同时检测环境水体中57种挥发性有机物

建立吹扫捕集-GC-MS法同时检测环境水体中57种挥发性有机物的方法,用HP-5MS色谱柱进行分离,质谱进行定性和定量分析。全扫描方式测试,特征离子进行分析,内标法定量,57种目标物在浓度范围1.0~100.0μg/L内皆具有大于0.990的线性相关系数。目标物的方法检出限在0.14~1.23μg/L范围内,重现性良好,加标回收率在71.7%~103.7%之间,测定标准偏差在3.2%~11.0%之间。     

顶空-气质联用法测定烟草中二硫代氨基甲酸酯残留量

为建立一种试剂消耗量小、杂质少的测定烟叶中二硫代氨基甲酸酯农药残留量的方法,用顶空-气相色谱/质谱联用法(GC/MS)检测二硫代氨基甲酸酯与氯化亚锡的盐酸溶液反应分解产生的二硫化碳,并与行业标准法进行分析比较。结果显示:顶空法和行标法的标准曲线相关系数R2分别为0.9983、0.9992;5次测量值的变异系数范围分别为6.26%~6.69%、4.26%~4.86%;检出限、定量限均为0.00mg/kg;方法的回收率分别在106.17%~108.71%和101.82%~105.34%%之间;相对平均偏差在两次平行测定值的允差之内;从全扫描总离子流图看出,顶空法的杂质峰数量明显减少,强度明显降低。     

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.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

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。