复方氨敏虎杖胶囊中马来酸氯苯那敏含量测定

建立了新的溶解方法检测复方氨敏虎杖胶囊中马来酸氯苯那敏含量。采用HPLC分析,用流动相作为溶剂溶解样品,测定马来酸氯苯那敏的含量。用溶解方法检测复方氨敏虎杖胶囊中马来酸氯苯那敏含量,最低检出量为0．126ug／mL,在7．2～180ug／mL内有良好的的线性关系,R=-0．9998;平均回收率99．77％（RSD为1．03％,n=9）。本方法减少了胶囊中其他成分对马来酸氯苯那敏含量测定的影响,使检测结果更加准确。     

HPLC法测小儿氨酚黄那敏颗粒含量及含量均匀度

建立了小儿氨酚黄那敏颗粒中马来酸氯苯那敏的含量及含量均匀度测定方法。采用HPLC,以Phenom enex Luna C18为色谱柱,乙腈：0.3%十二烷基硫酸钠溶液：磷酸（60：40：0.02）（用三乙胺调节pH值至3.3±0.1）为流动相;检测波长为224nm。测得马来酸氯苯那敏在0.02019~2.0190μg（R=0.9999）范围内呈线性关系,平均回收率为98.1%（RSD=1.2%）。测定方法简便,准确,可用于该制剂的质量控制。     

高效液相法(HPLC)测定复方氨酚烷胺颗粒中两种组分的含量

采用HPLC法测定复方氨酚烷胺颗粒中对乙酰氨基酚和马来酸氯苯那敏的含量。测试方法:色谱柱为Alltima-C18柱(250 mm×4.6 mm,5μm);流动相为甲醇-0.05 mol/L磷酸二氢钠(40∶60);流速为1.0 mL/min;检测波长为215 nm;磷酸调pH至2.60;柱温25℃。结果显示:对乙酰氨基酚和马来酸氯苯那敏分别在0.160224～0.240336 mg/mL和0.013464～0.020196 mg/mL范围内浓度与峰面积呈良好线性关系;平均回收率对乙酰氨基酚为101%(RSD=0.5%);马来酸氯苯那敏为100%(RSD=0.9%)。本法简便、快速、准确,可用于复方氨酚烷胺颗粒的含量测定。     

碳纳米管对马来酸氯苯那敏与牛血清白蛋白相互作用的影响

运用荧光光谱和红外光谱技术研究了在生理pH(pH=7.40)条件下,碳纳米管对马来酸氯苯那敏与牛血清白蛋白相互作用的影响。结果表明,在有无碳纳米管存在下,马来酸氯苯那敏均主要以静态猝灭方式猝灭牛血清白蛋白的内源性荧光。常温下碳纳米管的存在,使这种猝灭作用更强,在298 K、303 K两者的结合常数的比值分别为1.549和1.070。红外光谱表明,碳纳米管的存在,使马来酸氯苯那敏与牛血清白蛋白相互作用的-OH峰和-C=O峰发生了明显的改变,使两者的相互作用增强。     

小儿氨酚烷胺颗粒中马来酸氯苯那敏含量均匀度研究

研究了提高小儿氨酚烷胺颗粒中马来酸氯苯那敏含量均匀度的工艺方法。对小儿氨酚烷胺颗粒处方中纯化水量、湿混时间、纯化水温度这3个因素采用正交试验的方法进行统计学研究。实验通过优化处方中纯化水量(A)、湿混时间(B)、纯化水温度(C)取得最佳工艺参数,最佳组合为(A2,B1,C2),即纯化水用量为3.8 L,湿混时间为8 min,纯化水温度为40～45℃。结果表明,该制备方法提高了小儿氨酚烷胺颗粒马来酸氯苯那敏含量均匀度,优化了制备工艺,提高了产品质量,提高了生产效率。     

教学实践中马来酸氯苯那敏定量分析方法探讨

马来酸氯苯那敏是临床上常用的一类H1受体拮抗剂，在各类抗炎、抗病毒、抗过敏的复方制剂中均会添加，是药物分析教学中重点需要讲授的一种药物。本文从马来酸氯苯那敏的理化性质和结构特点入手，总结设计其分析方法的思维导图，阐述各分析方法的基本原理和特点，并进一步探讨其它潜在可行分析方法，为学生全面掌握本类药物的分析方法提供参考思路。     

LC-MS法测定维C银翘片中有效组分含量

以LC-MS为分析手段,建立了中药复方制剂维C银翘片中有效组分对乙酰氨基酚和马来酸氯苯那敏的定性和定量检测方法。在样品分离阶段,采用等梯度洗脱方式在Hypsil-ODS色谱柱(4.6 mm×250 mm,5.0μm,Agilent)上进行分离;在定性和定量方法上,确定了每个分析物的保留时间和一级质谱特征离子为定性参数,以紫外色谱峰面积为定量参数。结果表明:该方法对于2种有效组分对乙酰氨基酚和马来酸氯苯那敏的线性相关系数(r)分别为0.99990和0.99998,平均加标回收率分别为99.6%和98.0%,相对标准偏差(RSD)分别为0.36%和0.72%,最低检测限(LOD)分别为0.02μg.mL-1和0.05μg.mL-1。同时,该方法对维C银翘片中另外两种有效组分绿原酸和连翘苷也可以进行定性鉴定。     

HPLC法测定小儿氨酚黄那敏颗粒中马来酸氯苯那敏

HPLC法应用于小儿氨酚黄那敏颗粒中马来酸氯苯那敏含量及含量均匀度的测定,采用Kro-masil C18柱(250mmx4.6 mm,5μm),以甲醇-0.05mol·L<'-1>磷酸二氢钾溶液-三乙胺(140:860:0.25)(用磷酸调节pH值至2.3)为流动相,流速为1 mL·min<'-1>,检测波长为220n...     

高效液相色谱法测定愈创木酚甘油醚、福尔可定和马来酸氯苯那敏含量

采用高效液相色谱法同时测定愈创木酚甘油醚、福尔可定和马来酸氯苯那敏的含量.色谱柱为C18 (4.6mm×250 mm,5 μm),流动相为0.05 mol·L-1磷酸二氢钾溶液(每1000 mL加庚烷磺酸钠4.0g、三乙胺1.0 mL,用磷酸调pH值至2.5)—乙腈—甲醇(50∶ 20∶ 30),流速为1.0 mL·m...     

治感佳胶囊中扑热息痛、扑尔敏的含量测定

采用高效液相色谱法测定治感佳胶囊中扑热息痛(对乙酰氨基酚)、扑尔敏(氯苯那敏)的含量。以XB-C18为色谱柱,以甲醇-0.05 mol/L磷酸二氢钾-三乙胺(45∶55∶0.02)(用磷酸调pH值至3.4)为流动相,以261 nm为检测波长,流速为1.0 mL/min,柱温为30℃。对乙酰氨基酚在30.528～305.28μg/mL的浓度范围内线性关系良好,R2=1,平均回收率为98.4%,RSD为0.68%;氯苯那敏在24.47～244.74μg/mL的浓度范围内线性关系良好,R2=0.9998,平均回收率为95.8%,RSD%为0.75%。该方法简便、快捷、准确,能有效的控制治感佳胶囊的质量。     

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。