HPLC法测定注射用盐酸氨溴索中的含量及有关物质

采用Diamonsil C18柱（200mm×4．6mm,5μm）,以0．1mol／L磷酸二氢钾（pH值7．04-0．05）-乙腈（40：60）为流动相,流速为1．0mL·min^-1,检测波长为248nm,柱温：室温。建立高效液相色谱法测定注射用盐酸氨溴索中盐酸氨溴索的含量及有关物质。盐酸氨溴索的线性范围为20-100 μg·mL^-1,相关系数r=0．9997;平均回收率为99．90％（n=9）。该方法简便、准确、专属,可用于注射用盐酸氨溴索的含量及有关物质的测定。     

HPLC法测定盐酸氨溴索有关物质

目的建立高效液相色谱法测定盐酸氨溴索有关物质的方法。方法采用Wdchrom—C18（5μm,46＊250mm）色谱柱,流动相为0．01mol／L磷酸氢二铵溶液（用磷酸调pH值至7．0）～乙腈（50：50）,检测波长248nm,流速为1．0ml／min,进样量为20μ1。结果在该色谱条件下,盐酸氨溴索与各杂质分离良好。结论该方法专属性强、灵敏度高、重复性好,可用于有关物质的检测。     

盐酸罗哌卡因中特定杂质的测定

目的：建立高效液相色谱法测定盐酸罗哌卡因中特定杂质的含量。方法：色谱柱为WondasilCl8（250mm×4．6nun,5μm1,流动相为甲醇-水-三氟乙酸（50：50：1）,流速为0．4ml·min-1,ELSD载气流速为3．0ml／min,检测器飘移管温度为60℃,室温为30℃。结果：特定杂质在15-100μg／ml范围内的对数与峰面积对数有良好的线性关系（r2=0．9993,n=6）,且该方法的平均回收率为99．1％,RSD为1．3％（n=9）。结论该方法简便,结果准确,可用于盐酸罗哌卡因中特定杂质的测定。     

RP-HPLC法测定浓百合剂中盐酸麻黄碱和盐酸伪麻黄碱的含量

采用Rp-HPLC法建立了浓百合剂中盐酸麻黄碱和盐酸伪麻黄碱的含量测定方法。色谱柱为Agilent SBCFAq（4．6mm×150mm,5μm）;流动相为乙腈-0．1％三乙胺水溶液（2：98,冰醋酸调pH值3．0）;检测波长为207nm;柱温为25℃;流速为1．0mL·min^-1;选样量为10μL。结果表明,盐酸麻黄碱在浓度为4．8508～11．1552μg·mL^-1范围内与峰面积的线性关系良好,R为0．9997;盐酸伪麻黄碱在浓度为4．8672～11．3568μg·mL^-1范围内与峰面积的线性关系良好,R为0．9995。方法的加样回收率为盐酸麻黄碱98．28％,RSD=0．94％;盐酸伪麻黄碱98．01％,RSD=0．71％。该方法能够对浓百合剂中盐酸麻黄碱和盐酸伪麻黄碱的含量进行准确、快速的测定,结果稳定、可靠、重复性好,可用于该制剂的质量控制。     

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。     

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...     

HPLC法测定盐酸西替利嗪口腔崩解片的有关物质

目的：建立HPLC法测定盐酸西替利嗪口腔崩解片有关物质的方法。方法：采用PhenomenexLunaCl8（2）（4．6×250mm,57m）色谱柱,以乙腈-水（20：80）（用磷酸调节pH值至1．8）为流动相A,乙腈-水（35：65）（用磷酸调节pH值至1．8）为流动相B;流速为1．0ml／min;检测波长为230nm;柱温为30℃。结果：该色谱条件下,盐酸西替利嗪与各杂质完全分离,辅料不干扰有关物质测定。结论：采用HPLC法测定盐酸西替利嗪口腔崩解片的有关物质,方法简便,结果准确可靠。     

高效液相色谱测定环境水中2，4-二氯苯氧乙酸的方法研究

建立了以高效液相色谱法进行分离和检测环境水中2,4-二氯苯氧乙酸的方法。环境水中的2,4-二氯苯氧乙酸用SPE C18小柱进行固相萃取。液相色谱的条件是：色谱柱：SPE C18 150mm×4．6mm;流动相：甲醇：水（9：1,V／V）;流速：3mL·min^-1;柱温：40℃;检测器：UV 282nm;进样量10μL。回收率〉98％,最低检测限为0．01mg·L^-1。本法具有良好的灵敏度和重现性。     

HPLC法测定盐酸格拉司琼鼻喷剂的含量

目的：建立盐酸格拉司琼鼻喷剂中盐酸格拉司琼的含量的高效液相色谱测定法。方法：采用Phenomenex prodigy 5μ ODS（3）（250×4．6mm）色谱柱,以醋酸钠缓冲液（0．05mol·L^-1,含0．25％三乙胺．冰醋酸调PH至6．0）-甲醇（50：50）为流动相,流速：1mL·min^-1,检测波长为301nm。结果：盐酸格拉司琼线性范围为0．2-20μg（r=0．99996）．平均回收率为100．75％,RSD=1.01％（n=3）。结论：本方法具有操作简单,分析快捷准确,干扰少等优点。     

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。     

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.     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。     

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.     

基于ATRP法制备的触角状亲水性羟胺树脂的吸硼性能的研究

以大分子引发剂氯乙酰化聚苯乙烯微球(PS-acyl-Cl)经原子转移自由基聚合(ATRP)法引发丙烯酰胺(AM)和甲基丙烯酸缩水甘油酯(GMA)单体的共聚接枝,制得一种触角状亲水性环氧载体(PS-acyl-g-P(AM-co-GMA)),再经二乙醇胺(DEA)的环氧基开环胺化反应,得到一种含多个-NCH2CH2OH螯合配基的多齿-五元螯合环的触角状亲水性羟胺树脂(PS-acyl-g-P(AM-co-GMA)-DEA)。将此树脂用于硼吸附研究,结果表明,PS-acyl-g-P(AM-co-GMA)-DEA树脂对硼的吸附满足Langmuir方程,为单分子层吸附;饱和吸附量约为37.7 mg·g-1,且树脂5 min即可达到吸附平衡,与其它已报道的吸硼树脂相比,该树脂具有更高的吸附量和吸硼速率。吸附动力学研究表明,树脂吸附硼的过程主要由颗粒扩散过程控制。重复使用5次后该树脂的吸附量基本不变,解吸率均在90%以上,重复使用性能良好。