和中消滞合剂中总槲皮素的定性定量研究

目的建立和中消滞合剂中总槲皮素的定性定量方法。方法采用薄层色谱法定性,高效液相色谱法(HPLC)定量。色谱柱为Inertsil ODS-XP柱(4.6 mm×150 mm,5μm),流动相为甲醇-0.4%磷酸溶液(36∶64),检测波长360 nm,流速为1 ml·min~(-1),柱温为30℃。结果薄层色谱斑点清晰;HPLC的槲皮素进样浓度在0.039～0.413μg·ml~(-1)范围内,与峰面积值呈良好的线性关系,回归方程Y=46589X-4756(r=0.9999);平均加样回收率为98.10%,RSD=0.96%(n=6)。结论建立和中消滞合剂中总槲皮素的定性定量测定方法可行,可用于该制剂的质量控制。     

高效液相色谱法测定肌肽滴眼液中L-肌肽的含量及有关物质

目的:建立肌肤滴眼液中L-肌肤的含量测定的HPLC方法.方法:采用Kromasil NH2色谱柱(200 mm × 4.6mm,5 μm),流动相为乙腈-40 mmol·L-1磷酸氢二钾溶液(44:56,磷酸调pH 6.3).流速1.0 mL·min-1,检测波长为210 ml,柱温为35℃.结果:肌肤在9.93～99.3μg·mL-1范围内线性关系良好(r=0.999 8),平均回收率为99.8%(RSD=1.0%,n=9),滴眼液中含L-肌肽的标示百分含量为97.0%～102.0%.结论:该方法操作简便、重复性好、专属性强,可用作肌肤滴眼液中L-肌肽的质量控制.     

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。     

秸秆生物炭对尼泊金乙酯的吸附特性研究

为促进秸秆的资源化利用,该研究以甘蔗渣、茄子秸秆、玉米芯为材料,采用慢速热解技术于500℃条件下制备甘蔗渣生物炭(SBC)、茄子秸秆生物炭(EBC)、玉米芯生物炭(CBC),检测其去除水中尼泊金乙酯的特性。结果表明:(1)生物炭的制备原料显著影响其对尼泊金乙酯的吸附效果,三种秸秆制备的生物炭对尼泊金乙酯的吸附能力表现为SBC>EBC>CBC;此外,水中尼泊金乙酯的初始浓度、吸附温度和时间等因素均能影响吸附效果。(2)三种生物炭对尼泊金乙酯的去除率随尼泊金乙酯初始浓度的增加而降低,高温有利于吸附;45℃下尼泊金乙酯初始浓度为30mg·L^-1时,甘蔗渣生物炭(SBC)对尼泊金乙酯的去除率最高,达99.7%;反应在最开始的120min内增加迅速,经过270min达到吸附平衡。(3)生物炭对尼泊金乙酯的等温吸附线符合Langmuir模式和Freundlich模式。这为农业秸秆废弃物应用于尼泊金乙酯等有机污染物的去除提供了理论依据。     

HPLC法测定金菊五花茶颗粒中绿原酸的含量

目的:建立HPLC法测定金菊五花茶颗粒中绿原酸的含量。方法:色谱柱:Eclipse XDB-C18(150mm*4.6mm,5μm)流动相:甲醇-0.15%磷酸溶液(20:80)流速:1.0ml/min,检测波长:327nm。结果:绿原酸线性范围:0.026~0.260μg(r=0.9997),加样回收率为:99.20%,RSD=1.25%(n=6)。结论:本法操作简便,准确,可用于测定金菊五花茶冲剂中绿原酸的含量。     

高效液相色谱法测定重组人干扰素α-2b注射液中乙二胺四乙酸二钠含量

目的:利用高效液相色谱(HPLC)法测定重组人干扰素α-2b注射液中EDTA二钠(乙二胺四乙酸二钠)的含量。方法:将EDTA二钠与氯化铁溶液于70℃水浴中反应20 min左右;色谱柱为SunFire C18(250 mm×4.6 mm,5μm,Waters),流动相为5%甲醇+95%0.64 g/L四丁基溴化铵和4.1 g/L三水合乙酸钠混合液,用冰乙酸调pH值至4.0,流速1 mL/min,检测波长254 nm。结果:该测定方法线性范围为0.025~0.5 g/L,线性关系良好(r=0.9997),加样回收率为98.27%(n=9,RSD=2.55%)。结论:本方法准确、快速、可靠,可用于重组人干扰素α-2b注射液中EDTA二钠含量的测定。     

蒙药材刺柏叶中槲皮苷的含量测定

本实验建立了蒙药材刺柏叶中槲皮苷的HPLC含量测定方法.色谱条件为:Diamonsil C18(4.6 mm ×250 mm,5μm)和Shim-Pack C18(4.6 mm× 250 mm,5μm),流动相:甲醇-0.01 mol/L磷酸二氢钾溶液-冰醋酸(40∶ 60∶ 1.5),检测波长:254 nm,流速:1.0 mL/min,柱温:30℃.槲皮苷进样量在40.2 ng ～603.0 ng范围内线性关系良好(r =0.9998),其平均加样回收率为100.45％,RSD为0.69％(n=6).本方法简便易行,结果准确,重复性好,可用于刺柏叶中槲皮苷的含量测定.     

HPLC法测定腰痹通胶囊中三七总皂苷的含量

目的:建立HPLC测定腰痹通胶囊中三七总皂苷的含量测定方法。方法:采用高效液相色谱法,Kromasil C18(250mm×4.6mm,5μm)色谱柱,流动相为乙腈-水,梯度洗脱,流速1.0ml·min-1,柱温30℃,检测波长为203nm。结果:人参皂苷Rg1在1.4073μg~14.073μg范围内,呈良好的线性关系(r=0.9998),回收率为96.4%,RSD为1.7%。结论:本方法快速、准确,重复性良好,可作为腰痹通胶囊的质量分析控制方法。     

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。     

大鼠血浆中洛伐他汀的HPLC测定及药动学研究

目的:探索采用高效液相色谱法测定大鼠血浆中洛伐他汀浓度的方法。方法:血浆样品采用环已烷-二氯甲烷(3.5:1,V/V)提取,HPLC条件为色谱柱采用XTerra(?)MSC18柱(150×2.1 mm,5μm),流动相为乙腈-水(63L37,V/V),柱温35℃,检测波长为238nm。结果:大鼠血浆中洛伐他汀在0.01～5μg/mL线性范围内线性关系良好,最低检测浓度为0.01～g/mL,方法的提取回收率为81%～95%,日内、日间RSD均小于9.55%;药代动力学结果表明洛伐他汀在雌雄大鼠体内的Tp、Cmax和AUC均有显著性差异(p<0.05)。结论:建立的HPLC方法简便、灵敏度高,重现性好,药动学研究表明洛伐他汀在大鼠体内存在性别差异。     

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.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

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.