HPLC法测定原料药尿素-~(13)C及其有关物质含量

采用COSMOSIL-C18色谱柱,以90%乙腈-水溶液为流动相、流速为1.0 mL/min、柱温为30℃、进样量为20μL、检测波长为200 nm,建立了HPLC测定原料药尿素-13C及其有关物质含量的方法。尿素-13C原料药在3.2~4.8 mg/mL范围内线性关系良好(r=0.999 5),平均回收率为99.40%(RSD=0.63%);有关物质缩二脲在0.6~9.0μg/mL范围内线性关系良好(r=0.998),加标回收率为100.4%(RSD=1.53%)。此方法简便、结果准确,可用于原料药尿素-13C及其有关物质含量的测定。     

HPLC法测定沙库必曲缬沙坦原料药的含量及有关物质

目的:采用HPLC法测定沙库必曲缬沙坦的含量及有关物质。方法:采用色谱柱ZORBAX Eclipse Plus C_(18)(150 mm×4.6 mm×3.5 um)为色谱柱,以0.1%磷酸溶液为流动相A,乙腈为流动相B,以流动相A︰流动相B(70︰30)梯度洗脱,流速为1.1 mL/min。稀释液为pH=2.0磷酸水溶液︰乙腈=70︰30,检测波长为252 nm,柱温为35℃。结果:沙库必曲的线性范围为38.39-57.58μg/mL,缬沙坦的线性范围为40.14-60.21μg/mL,3批样品中沙库必曲缬沙坦的含量分别为50.80/49.08%、50.89/48.75%、51.11/48.88%;有关物质A-J的线性范围分别为0.02%~0.20%。结论:本方法简便、准确,适用于沙库必曲缬沙坦含量及有关物质的测定。     

UPLC-MS/MS联用技术测定厄贝沙坦中N-亚硝基二甲胺与N-亚硝基二乙胺

开发并验证了一种定量分析厄贝沙坦中2种基因毒性杂质的超高效液相色谱-串联质谱(UPLC-MS/MS)方法。釆用Agilent ZORBAX Eclipse plus C₁₈色谱柱(3.0 mm×100 mm, 1.8μm),0.1%甲酸水溶液-甲醇为流动相梯度洗脱,大气压化学电离、正离子平行反应监测模式(APCI+PRM)进行检测,结果显示N-亚硝基二甲胺(NDMA)和N-亚硝基二乙胺(NDEA)在0.225～1.5 ng/mL浓度范围内线性关系良好,检测限(LOD)为0.022 ng/mL、0.044 ng/mL,供试品加标溶液回收率为78%～103%。所建立的方法灵敏、准确,可满足对厄贝沙坦中2种N-亚硝胺类基因毒性杂质的检测。     

高效液相色谱法测定磺胺二甲嘧啶的有关物质

目的:用高效液相色谱法测定磺胺二甲嘧啶的有关物质。方法:用Alltima C18(5μm,250 mm×4.6 mm)色谱柱;流动相为13.6 g/L磷酸二氢钾缓冲液(用20 g/L氢氧化钾溶液调节pH至4.50)—甲醇的体积比为55∶45;流速1.0 mL/min;检测波长:275 nm;进样体积:20μL。结果:磺胺二甲嘧啶在80~120μg/mL范围内线性关系良好(r=0.9999),磺胺线性范围为0.15~1μg/mL(r=1.0000),磺胺脒线性范围为0.15~1μg/mL(r=1.0000)。结论:该方法简便、准确、专属性好,可用于磺胺二甲嘧啶含量及有关物质检测。     

高效液相色谱法测定磺胺二甲嘧啶的有关物质

目的:用高效液相色谱法测定磺胺二甲嘧啶的有关物质。方法:用Alltima C18(5μm,250 mm×4.6 mm)色谱柱;流动相为13.6 g/L磷酸二氢钾缓冲液(用20 g/L氢氧化钾溶液调节pH至4.50)—甲醇的体积比为55∶45;流速1.0 mL/min;检测波长:275 nm;进样体积:20μL。结果:磺胺二甲嘧啶在80~120μg/mL范围内线性关系良好(r=0.9999),磺胺线性范围为0.15~1μg/mL(r=1.0000),磺胺脒线性范围为0.15~1μg/mL(r=1.0000)。结论:该方法简便、准确、专属性好,可用于磺胺二甲嘧啶含量及有关物质检测。     

R-HPLC法测定鬼臼毒素软膏含量和有关物质的研究

目的:采用反相高效液相色谱法测定鬼臼毒素软膏的含量及其有关物质。方法:采用ODS C18色谱柱(5μm,4.6mm×200mm),以甲醇-水(55∶45)为流动相,流速1.0mL·min-1,检测波长292nm。结果:反相高效液相色谱法测定的线性范围为0.303~0.707mg/mL,相关系数r=0.9998;三种不同浓度供试液精密度分别为1.05%(n=5)、0.87%(n=5)、1.16%(n=5)。结论:采用反相高效液相色谱法测定鬼臼毒素软膏的含量及有关物质,方法简便、快速、准确、专属性好。     

HPLC法测定盐酸度洛西汀肠溶胶囊有关物质

建立了盐酸度洛西汀有关物质测定的高效液相色谱(HPLC)方法。采用ZorbaxSB-C8柱(4.6 mm×75 mm,3.5μm),以磷酸盐缓冲液-甲醇-四氢呋喃(体积比为587∶323∶90)为流动相,在检测波长为230 nm的条件下:主药和有关物质能较好地分离,在38.8～155.2μg/mL(r=1.000 0,n=8)内,度洛西汀质量浓度与峰面积线性关系良好;分别在0.08～0.33μg/mL(r=0.999 9,n=8)和0.08～0.32μg/mL(r=0.999 7,n=8)内,杂质Ⅲ和Ⅷ的质量浓度与峰面积呈良好的线性关系。该方法简便、准确、可行、精密度高,可用于盐酸度洛西汀肠溶胶囊有关物质的质量控制。     

高效液相色谱法测定维生素C泡腾片有关物质含量

目的:建立维生素C泡腾片中有关物质含量的测定方法。方法:采用高效液相色谱法,色谱柱为PerfectChrom 100 C18(250 mm×4.6 mm,5μm);流动相为磷酸盐缓冲溶液(pH2.50±0.05);流速:0.8mL/min;进样量:20μL;检测波长为245 nm。结果:维生素C质量浓度在4.0~16.0μg/mL范围内,进样量在0.0618~0.5562μg范围内与峰面积线性关系良好(r=0.9990)。结论:该方法简便准确,稳定性好,可用于维生素C泡腾片中有关物质的含量测定。     

HPLC法测定阿米三嗪萝巴新片的有关物质

目的:采用HPLC法测定阿米三嗪萝巴新片的有关物质。方法:采用C18(4.6 mm×250 mm,5μm)色谱柱,流动相为甲醇∶水=85∶15(每1000 mL含二乙胺5μL);流速为1.5 mL/min,检测波长为222 nm。结果:阿米三嗪及萝巴新的线性范围分别为0.15~4.5μg/mL、0.05~1.5μg/mL;平均回收率分别为100.6%、99.3%;结论:本法简便、准确、适合于阿米三嗪萝巴新片有关物质测定。     

雷尼酸锶质量标准研究

目的建立雷尼酸锶有关物质和含量测定的HPLC方法。方法有关物质检查及含量测定:Agilent C8柱(250 mm×4.6 mm,5μm);水(磷酸调pH为2.0)—甲醇—四氢呋喃(91:4:5)为流动相,流速为1.0 mL·min~(-1);有关物质检查与含量测定的检测波长为240 nm;柱温为30℃。结果经方法学验证,在选定的色谱条件下,雷尼酸锶与有关物质及中间体分离完全。雷尼酸锶在20～800μg·mL~(-1)范围内,峰面积与浓度线性关系良好(r=0.9999),检测限为1.0 ng,定量限为3.4 ng。结论此方法准确、灵敏、专属性强,可用于测定雷尼酸锶的有关物质和含量。     

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。