HPLC-ELSD及紫外分光光度法测定三七中皂苷的含量

采用反相高效液相色谱蒸发激光散射检测器测定三七中人参皂苷Rg1的含量。色谱柱为CLC-ODS(6．0mm×150mm),流动相为乙腈-水(3070),蒸发激光散射检测器。定量方法简单,准确。回收率为100．50％,RSD为1．82％。并用紫外分光光度法测定了三七中总皂苷的含量,结果和HPLC法基本一致,说明该方法定量准确,回收率为101．50％,RSD为1．44％。结论认为两方法均可以控制三七的质量。     

HPLC法测定蔓荆子黄素的含量

以蔓荆子黄素为指标,用反相 ＨＰＬＣ法测定了蔓荆子中的含量,实验采用 Ｃ_(１８)柱,以甲醇－０．４％磷酸溶液（６０： ４０）为流动相,检测波长 ２５８ｎｍ,用外标法测定,回收率为 ９８．１８％,ＲＳＤ１．４６％,线性范围 ０．１５～０．７５μｇ。本法快速简便,重现性好,为蔓荆子质量控制提供了可靠的依据。     

Monoamines (norepinephrine,dopamine, serotonin) in the rat medial vestibular nucleus: endogenous levels and turnover

Summary Monoamine (norepinephrine, dopamine, serotonin) and metabolite endogenous levels were determined in the rat medial vestibular nucleus (MVN) using HPLC with electrochemical detection. As a comparison, the locus cruleus (LC) and dorsal raphe nucleus (RD) which contain the cell bodies of MVN noradrenergic and serotoninergic neurons respectively were also analyzed. Norepinephrine (NE) and serotonin (5-HT) basal levels of MVN were high (33.8 and 39.2pmol/mg protein respectively) but lesser than in LC or RD. Great amounts of MHPG and 5-HIAA were also present in the MVN. The turnover of NE assessed both from the ratio MHPG/NE and by the decrease in the NE content after treatment with -methylparatyrosine was faster in the MVN (half-life 1.5h) than in LC (half-life 3.6h). On the other hand, the ratio 5-HIAA/5-HT was lower in the MVN (0.58) than in the RD (0.85) indicating a smaller 5-HT turnover in the MVN. In addition, like LC and RD, the MVN contained meaningful amounts of dopamine (DA) and DOPAC. The high ratio DA/NE (0.27) suggests the presence of non precursor specific dopaminergic pools. However, individualized dopaminergic neurons have not yet been demonstrated. The data are discussed in line with the possible neurotransmitter function of monoamines in the MVN.     

Cation exchange contribution to the retention of specific quaternary ammonium compounds in reversed-phase high-performance liquid chromatography

The influence of electrolytes on the retention of organic cationic solutes in reversed-phase high-performance liquid chromatography (RP-HPLC) has been investigated. The effects of the nature and concentration of electrolytes and mobile phase pH on the retention of two model quaternary ammonium compounds were studied on mu-Bondapak C18 stationary phase with aqueous methanolic eluents. The nature and concentration of inorganic cations added to the mobile phase modified the retention of the solutes. The counter anion of the added electrolyte did not perceptibly influence solute retention at constant mobile phase pH, although it did significantly influence solute retention when the electrolytes were added to unbuffered mobile phases. The retention data are consistent with the inclusion of an ion exchange contribution to the retention of cationic solutes in the systems investigated.     

非那甾胺中5β-异构体的HPLC分离与测定

目的 分离和测定非那甾胺中5β-异构体杂质。方法 高效液相色谱法,色谱柱为DiamonsilTMC18柱(4.6 mm×200 mm,5μm),流动相为乙腈-四氢呋喃-水(3:1:8),流速为1.5 mL·min-1,检测波长为210nm,柱温25℃。结果 非那甾胺与5β-异构体能有效分离,两者最低检测浓度均为0.05μg·mL-1。结论 本法操作简便,重现性好,可有效控制非那甾胺的质量。     

反相高效液相色谱法测定蒙成药八味清心沉香散中没食子酸的含量

目的：建立蒙成药八味清心沉香散中没食子酸的含量测定方法。方法：高效液相色谱法，Alltima C-18柱。Phenomen Irregular C-18柱，流动相0．2％甲醇的乙腈溶液-0．1％三乙胺和0．1％磷酸水溶液(1：99)，检测波长220nm。结果：没食子酸在0．0244μg～0．1220μg范围内呈良好的线性关系，r=0．9997，平均回收率98．89％，RSDl．47％(n=5)。结论：该方法简便、快速、重现性好，能够控制该制剂的质量。     

地肤子及其混淆品的扫描电镜与紫外法鉴别研究

分别采用扫描电镜和紫外光谱法对地肤子、藜、小藜和扫帚菜四种药材进行了比较鉴别。结果表明：扫描电镜下四种药材的胞果、毛茸、气孔和种子形态特征有较为明显的区别；紫外光谱扫描结果表明地肤子和扫帚菜无明显区别，但与藜和小藜之间有显著区别。     

口腔愈疡颗粒质量标准的建立

目的：建立口腔愈疡颗粒的质量标准。方法：采用高效液相色谱法对成品中芍药苷进行含量测定。结果：芍药香浓度线性范围为：0．104—0．520μg/ml,γ=0.9993。样品平均回收率为98．85％，RSD为1．27％(n＝5)。结论：该方法适用于口腔愈疡颗粒的质量控制。     

HPLC法测定冠心通络片中橙皮苷的含量

目的:建立冠心通络片中橙皮苷含量的测定方法。方法:采用高效液相色谱法,色谱柱为HypersilODSC18(5μm,4.6mm×100mm);流动相为甲醇-5%醋酸溶液(30∶70);检测波长为283nm;柱温为30℃;流速为1.0mL/min。结果:橙皮苷在419.2～2096μg(r=0.9998,n=5)范围内呈良好的线性关系;平均回收率98.71%;RSD为1.13%。结论:本法检测快速,定量准确,可用于冠心通络片的定量分析。