HPLC法同时测定草苁蓉中草苁蓉纳拉苷和草苁蓉苷B

为建立高效液相色谱法同时测定草苁蓉干燥全草中草苁蓉纳拉苷和草苁蓉苷B的含量的分析方法,采用色谱柱:Klimail 100-5 C₁₈柱(250 mm×4.6 mm,5μm);流动相:以乙腈为流动相A,以0.5%甲酸水溶液为流动相B,梯度洗脱条件:0~12 min,15%A;12~30 min,15%~20%A;30~40 min,20%~25%A;40~45 min,25%~30%A;45~60 min,30%~100%A;流速:1.0 mL·min^-1;检测波长:260 nm;柱温:30℃;进样量:20μL。得到草苁蓉纳拉苷的线性范围为4.688~150μg·mL^-1(R²=0.999 5);草苁蓉苷B的线性范围为3.438~110μg·mL^-1(R²=0.999 1);平均回收率分别为97.86%、96.55%;RSD分别为1.01、1.23(n=9)。本研究利用高效液相色谱法建立了同时测定草苁蓉全草中草苁蓉纳拉苷和草苁蓉苷B两种组分的方法。方法学的验证结果证明,该方法简便、快捷,重现性好,可以用于草苁蓉中草苁蓉纳拉苷和草苁蓉苷B两种组分的含量测定。     

反相高效液相色谱法测定石榴皮多酚类物质方法的建立及分析

建立了同时测定石榴皮多酚中绿原酸、表儿茶素、鞣花酸和槲皮素含量的反相高效液相色谱方法。采用色谱柱Hypersil ODS2(250 mm×4.6 mm,5μm),其流动相为乙腈-0.4%磷酸溶液(体积比17∶83),流速为1.0m L/min,检测波长310 nm,柱温为30℃。建立安石榴甙测量方法,色谱柱为Hypersil ODS2(250 mm×4.6 mm,5μm);流动相为甲醇-2%冰醋酸(体积比7∶93);体积流量为1.0 m L/min;检测波长为232 nm;柱温25℃。结果表明:绿原酸、表儿茶素、鞣花酸、槲皮素和安石榴甙在一定浓度范围内与峰面积呈良好的线性关系,其平均回收率分别为100.66%(RSD=2.06%)、100.05%(RSD=0.58%)、100.05%(RSD=0.51%)、99.51%(RSD=1.22%)和99.79%(RSD=0.52%)。此结果说明反相高效液相色谱可用于测定石榴皮多酚类物质。     

高效液相色谱法测定甜菊糖苷中甜菊醇的含量

建立高效液相色谱法测定甜菊糖苷中甜菊醇的含量。色谱条件:色谱柱为Phenomenex C18(4.6 mm×250 mm,5μm);流动相为乙腈-水(50∶50);流速1.0 mL/min;检测波长213 nm;柱温30℃;进样量10μL。线性范围为1.046μg/mL~52.3μg/mL(r=0.9997),加标平均回收率为96.60%,RSD为0.51%(n=6)。本方法准确度高、精密度高、重复性好、简捷易操作,可以作为甜菊糖苷中甜菊醇含量的测定方法。     

高效液相色谱法测定1,25- 二羟基维生素D2纳米乳注射液的含量

目的:建立高效液相色谱法测定1,25-二羟基维生素D_2纳米乳注射液含量。方法:采用C18-STⅡ色谱柱(4.6×250 mm,5μm);流动相为乙腈-水=85:15(V/V);流速:1.5 m L/min;检测波长:274 nm;温度:室温;进样量:200μL。结果:该方法专属性好,平均回收率99.96%(RSD为0.63%,n=9);溶液在冷藏(2~6℃)保存24 h稳定(RSD=0.98%,n=7);在0.06μg/m L~4.0μg/m L范围内线性关系良好,其回归方程为:Y=201098 X-8412.5(R2=0.9998,n=9)。结论:该方法简便、快捷、灵敏度高、专属性强,可用于该注射液的含量测定。     

HPLC测定7种龙胆科植物花中龙胆苦苷与獐牙菜苦苷的含量

目的:建立7种龙胆花中龙胆苦苷和獐牙菜苦苷含量测定的HPLC方法。方法:采用微波辅助动态回流法进行提取,色谱条件:Fusion-RP 80 A C18柱(150 mm×4.6 mm,5μm);流动相:甲醇-0.2%磷酸溶液梯度洗脱(0~25 min:15%~30%);流速:1 mL/min;柱温:30℃;检测波长240 nm。结果:7种龙胆花中獐牙菜苦苷和龙胆苦苷的色谱峰与共存组分完全达到基线分离,线性范围分别为0.105~0.945μg(r=0.999 9),0.3~0.7μg(r=0.999 9),平均加样回收率分别为97.8%(RSD=1.02%),98.9%(RSD=1.51%)。结论:所建立的方法测定快速,结果准确可靠。     

高效液相色谱法测定降糖1号胶囊中淫羊藿苷的含量

目的:建立测定降糖1号胶囊中淫羊藿苷含量的方法。方法:室温条件下超声提取降糖1号胶囊中的淫羊藿苷,用D101大孔吸附树脂柱纯化提取物,高效液相色谱法(HPLC)测定含量,色谱柱:Hypersil ODS2(4.6mm×200mm,5μm);流动相:乙腈-水(30:70);流速:1ml/min,检测波长270nm;柱温:30℃。结果:淫羊藿苷的进样量在0.08μg-0.28μg范围内线性关系良好(r=0.9999),平均加样回收率(n=6)为96.66%,RSD为2.14%。结论:该方法简便、准确、重复性好,可用于降糖1号胶囊的质量控制。     

不同产地玛咖中酰胺含量分析

建立玛咖酰胺测定方法,测定不同产地玛咖切片中玛咖酰胺含量。采用HPLC法,色谱条件为Sepax Sapphire C18色谱柱(250 mm×4.6 mm,5μm)流动相:乙腈(A)-0.05%磷酸水溶液(B),梯度洗脱:0~15 min,90%~95%A;15~50 min,95%A。检测波长208 nm,体积流量1.0 m L/min,柱温30℃。酰胺1、酰胺2、酰胺3分别在0.88~132μg/m L、0.85~128μg/m L、0.96~144μg/m L线性关系良好。酰胺1、酰胺2平均回收率分别为99.21%(RSD=1.64%)、98.59%(RSD=1.75%)。不同产地玛咖中玛咖酰胺含量差别较大,建立可靠、准确、重复性好的检测方法,有利于评价不同产地玛咖的质量。     

精制左旋多巴中L-多巴含量及主要杂质成分的HPLC检测

L-多巴作(L-dopa)为治疗帕金森氏病的主要药物,可以作为食品添加剂开发针对特殊人群的功能性产品。从食药两用植物猫豆种子中纯化的精制L-多巴中通常会含有少量L-酪氨酸等杂质,从而影响精制品作为药物使用。本文建立了一种高效液相色谱方法,可以有效的检测从猫豆中提取的L-多巴主要杂质成分L-酪氨酸(L-tyr)和L-苯丙氨酸(L-phe)的含量。在紫外检测下(λ=260 nm),液相条件为:色谱柱:Dikma Spursil C18柱(250 mm×4.6 mm,5μm);流动相:2%乙酸溶液-甲醇(90∶10);流速:0.8 m L/min;检测波长:260 nm;柱温:室温;能够检测L-多巴和L-苯丙氨酸;在荧光检测下(λex=280 nm,λem=314 nm),液相条件为:色谱柱:Dikma Spursil C18柱(250 mm×4.6mm,5μm);流动相:0.8%甲酸-乙腈(98∶2);进样量:10μL;柱温:室温;能够检测L-多巴与L-酪氨酸。     

高聚物型色谱柱在高效液相色谱法中一步分析制备葛根素及大豆苷元的应用

建立了使用以聚苯乙烯-二乙烯基苯(PS-DVB)为基质的高聚物型色谱柱一步分离制备葛根提取液中的葛根素和大豆苷元的方法。采用MKF-RP-HH色谱柱(300 mm×7.8 mm,8μm),葛根提取液经70%乙醇溶解稀释,以水(A)和甲醇(B)为流动相进行梯度洗脱,流速1.0 m L/min,检测波长250 nm,柱温30℃。结果表明:葛根提取液中的2种有效成分葛根素和大豆苷元均与杂质达到了较好的分离效果,且柱效大于2 100 N/m,优于常规的C-18硅胶色谱柱(柱效:1 000 N/m)。该高聚物型色谱柱不仅可用于上述分析,还可用作半制备柱制备得葛根素和大豆苷元纯品,葛根素在2~50μg/m L范围内线性关系良好,回归方程为y葛根=1.342 2x-1.018 4,线性相关系数为0.999;大豆苷元在2~20μg/m L范围内线性关系良好,回归方程为y大豆=2.275x+0.869 5,线性相关系数为0.999;葛根素和大豆苷元的纯化得率分别可达95.9%和78.5%。     

高效液相色谱法测定罗汉果根中两个降三萜配糖体

建立了高效液相色谱测定罗汉果根中两个结构新颖的降三萜糖苷,罗汉果酸苷乙Ⅱ(Siraitic acidⅡB)和罗汉果酸苷甲Ⅱ(Siraitic acidⅡA)含量的方法。色谱条件:色谱柱:ZORBAX SB-C18柱(4.6mm×150mm,5μm);柱温:25℃;流动相:乙腈-水(梯度洗脱:0→4min:35%乙腈;4→16min:35%→45%乙腈);流速:0.5mL/min;检测波长:230nm;进样量:10μL。结果表明,罗汉果酸苷乙Ⅱ在0.05～0.3mg/mL,罗汉果酸苷甲Ⅱ在0.05～0.25mg/mL之间线性关系良好。该方法稳定,精密度、重现性好,且样品处理简单,提取与检测时间短。     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.