粉唑醇的高效液相色谱分析

[目的]建立了一种用高效液相色谱测定粉唑醇的定量分析方法.[方法]采用C18色谱柱,以甲醇-水(体积比为60:40)为流动相,流量为1.0 mL/min,柱温为25℃,选择220 nm为检测波长进行检测.[结果]方法的线性相关系数0.9997,标准偏差为0.28,平均回收率为99.60%.[结论]该方法简便、快速、能进行准确定量分析,结果稳定.     

水杨腈的高效液相色谱分析

[目的]建立了一种用高效液相色谱测定水杨腈的定量分析方法.[方法]采用C18色谱柱,以乙腈-水(体积比48∶52)为流动相,流量为0.5 mL/min,柱温为30℃,选择230 nm为检测波长进行检测.[结果]方法的线性相关系数0.9997,标准偏差为0.20,平均回收率为99.8％.[结论]方法具有简便、快速、分离效果好、精密度和准确度高、线性关系好的特点.     

离子色谱法测定草铵膦含量

[目的]建立草铵膦原药和草铵膦水剂的离子色谱定量分析方法.[方法]采用8 mol/L氢氧化钾水溶液为流动相,AS-11离子色谱柱(含AG-11保护柱)以及电导检测器对其有效成分草铵膦进行外标法定量分析.[结果]方法线性相关系数为0.9995(50～250 mg/L),标准偏差均小于0.08,变异系数均小于0.15％,平均回收率为100.26％.[结论]该方法可用于测定草铵膦原药或草铵膦水剂中的有效成分,具有精密、准确、简便易行的特点.     

高效液相色谱法测定乙烯菌核利的含量

[目的]建立一种使用高效液相色谱测定乙烯菌核利的定量分析方法.[方法]采用高效液相色谱,使用Eclipse XDB C8色谱柱,以乙腈-水(体积比80:20)为流动相,流速为1 mL/min,在205 nm波长下对乙烯菌核利进行定量分析.[结果]当乙烯菌核利质量浓度在1～50 mg/L范围内,方法的线性相关系数为0.999 95;标准偏差为0.122,变异系数为0.126％,平均回收率为99.63％.[结论]方法快速、准确,适用于乙烯菌核利的定量分析.     

肟菌酯原药高效液相色谱分析

[目的]建立一种采用高效液相色谱测定肟菌酯的定量分析方法.[方法]采用Agilent C18色谱柱和二极管阵列检测器,乙腈-甲醇-水(体积比55∶25∶20)为流动相,柱温40℃;流速1.0 mL/min,进样量5μL,在250 nm波长下对肟菌酯的有效成分进行外标法定量分析.[结果]方法线性相关系数为0.9999;变异系数分别为0.26％;平均回收率为100.3％.[结论]该方法可用于常规分析和质量控制研究,快速、简单,并具有良好的精度和可靠性.     

20.8％氟胺·烯禾啶乳油高效液相色谱分析

[目的]建立一种同时分析氟磺胺草醚和烯禾啶的高效液相色谱法.[方法]采用反相高效液相色谱法,以甲醇、水和磷酸为流动相,使用C18色谱柱和二极管阵列检测器,在280 nm波长下对试样中的氟磺胺草醚和烯禾啶进行分离和定量分析.[结果]氟磺胺草醚和烯禾啶的线性相关系数分别为0.9999、1.0000;标准偏差为0.067、0.061;变异系数为0.532％、0.727％;平均回收率为99.89％、99.69％.[结论]方法操作简单、快速、准确,适用于氟胺·烯禾啶乳油样品的定性和定量分析.     

百草枯水剂中臭味剂—烷基吡啶的分析

[目的]目前百草枯水剂中臭味剂的分析方法尚未见报道,随着百草枯水剂日益广泛的使用和愈发严格的市场监管,急需建立一个合适的分析方法.[方法]在碱性条件下,以甲苯为萃取剂萃取百草枯水剂中的臭味剂烷基吡啶.采用FID,HP-Innowax毛细管色谱柱,1,3,5-三甲苯为内标物,建立了气相色谱分析法.对萃取物中的3,5-二甲基吡啶、2,3-二甲基吡啶和3-乙基吡啶进行定量分析.[结果]方法的回收率在98％左右,标准偏差分别为0.0029、0.0020、0.0007,变异系数分别为0.0042％、0.0081％、0.0101％,线性相关系数均为1.[结论]该方法适用于百草枯水剂中烷基吡啶臭味剂的定量分析.     

40％环丙唑醇悬浮剂高效液相色谱分析

[目的]建立一种对40％环丙唑醇悬浮剂进行分离和测定的高效液相色谱分析方法.[方法]采用高效液相色谱法,以甲醇-超纯水为流动相,使用SunFire C18为填料的不锈钢色谱柱和PDA检测器,在220 nm波长下对供试物中的环丙唑醇进行分离和定量分析.[结果]该分析方法的环丙唑醇线性相关系数R2为0.999,标准偏差为0...     

SYP-1545原药的高效液相色谱分析

[目的]建立快速灵敏检测SYP-1545的高效液相色谱定量分析方法。[方法]采用Agilent ZORBAX SB-C_(18)色谱柱,以乙腈∶水体积比40∶60为流动相,在228nm波长下对SYP-1545原药进行分离和定量分析。[结果]方法的线性相关系数0.9998,标准偏差为0.11,变异系数为0.12%,平均回收率为99.7%。[结论]该分析方法使得SYP-1545得到较好分离,操作简便、快速,定量分析结果准确、稳定,可用于SYP-1545的精密定量分析。     

SYP-20351原药的高效液相色谱分析

[目的]建立快速灵敏检测SYP-20351的高效液相色谱定量分析方法。[方法]采用Agilent ZORBAX SB-C_(18)色谱柱,以甲醇-酸水(体积比55∶45)为流动相,DAD检测器对SYP-20351原药进行分离和定量分析。[结果]方法的线性相关系数0.999,标准偏差为0.10,变异系数为0.12%,平均回收率为100.2%。[结论]该分析方法使得SYP-20351得到较好分离,操作简便、快速,定量分析结果准确、稳定,可用于SYP-20351的精密定量分析。     

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。