简介:摘要目的HPLC法建立升麻指纹图谱。方法采用AgilentEclipseXDB-C18色谱柱(4.6×250mm,5μm);流动相为乙腈(A)和0.1%磷酸溶液(B);梯度洗脱0~20min,5%~13%A,20~60min,13%A~18%A;60~90min,18%A~28%A,90~110min,28%A~50%A,110~115min,50%A~5%A;流速1.0ml/min;进样量10μl;柱温30℃;检测波长316nm。结果建立了升麻的HPLC指纹图谱,标定出9个共有指纹峰。结论升麻药材的指纹图谱可用于升麻的定性鉴别,为升麻药材的质量控制提供参考依据。
简介:TheroleplayedbyDNAinmolecularbiologyisclearlyrecognizedtobevitaltolifeonthisplanet.8-oxo-7,8-dihydro-2deoxyguanosine(=8-OHdG),isprobablythemostimportantproductof"oxidativestress”inDNA.ItsconcentrationinDNAis,infact.aquantitativeanalysisofthedegreeofDNAdamagethatanorganismhasundergone.Duetotheimportanceof8-OHdGofnucleicacidginmutagenesis,carcinogenesisandaging,numerouschemicalandbiologicalinvestigationshavebeenmadeonthissubjectinthepasttime.Kuchinoandco-workershavefoundthat8-OHdGresidueinDNAismisreadingduringtheprocessofDNAreplication.Recently,somereportshavebeenpresentedonhigh8-OHdGlevelsinpatientssufferingfromvariousdiseasessuchaschronichepatitis,Fanconisanemia,diabetesmellitusandHelicobacterpyloriinfections.Asaresult,8-OHdGisausefulmarkerforthestudyofDNAdamagearisingfromreactiveoxygenspeciesandisofgreatsignificanceforcancerresearch.The8-OHdGlevelsinDNAcanhelpunderstandthemechanismofcarcinogensandleadtomoreeffectivetreatmentsformanydifferenttypesofcancer.Forthesereasons,ananalysisof8-OHdGwithquickness,lowcostandhighaccuracyisrequired.
简介:FurnitureofHongmu,creamofChineseculture,hasalonghistoryandenjoysgreatpopularityforitsclassicappearanceandelegantdisposition.Thetraditionalmethodoftheidentificationistoevaluatethemacroformandanatomicalfeatures.Inthispaper,anewmethodbasedonthedifferencesamongthechemicalcharacteristicsofbiologicalmetabolitesofsamplesisdeveloped.Intheresearch,highperformanceliquidchromatography(HPLC)fingerprintswereemployedtodiscriminatefourspeciesofHongmu,includingPterocarpusindicus,Pterocarpusmacarocarpus,Dalbergiamelanoxylon,andDalbergialouvelii.Theresultsshowedthat,accordingtotheretentiontimeandrelativepeakareaofdifferentcomponentsinwoodextracts,thedistinctioncanbeeasilymadebetweendifferentspecies.BasedontheHPLCfingerprints,similaritiesbetweensampleswereevaluatedbycorrelationcoefficients.Theresultsweregreaterthan0.81betweenthesamespecies,andlessthan0.21betweendifferentspecies,whichshowedweakcorrelationbetweendifferentspecies.Inordertoestimatetheoverallfeaturesofthefingerprints,hierarchicalclusteringandprincipalcomponentanalysis(PCA)wereusedandtheresultsshowedpronouncedclusteringeffectamongthesamespecies.TheinvestigationindicatedthatpatternrecognitioncouldaccuratelyreflectthesignificantdifferencesbetweendifferentspeciesofHongmu,andcanbeusedasareferenceforqualitycontrol.
简介:在1954年2月11日,有Ms7.3的地震发生在Hexi走廊的Shandan县,韦斯特中国。它是在在1949以后的西北中国的第一大地震。地震留给了47个人死者,伤害的332个人和几万个人无家可归者;将近7277座大楼被损坏或崩溃并且性质损失在不平的估计是超过10亿Ynan(RMB)。在meizoseismai区域,紧张是,Hongsihu盆和Shandan县是最严重的损坏,并且在Shandan,地震受灾的区域是4800km2。在纸,简短介绍被介绍给Shandan地震,包括基本参数,地震紧张的分发和自然环境。造破坏的特征特别地被讨论,地震灾难分发analysed.Finally展示,经济损失评估也是,象对地震和灾难减小的保护的含意一样的地震损坏,经验和课同样多的原因被总结。
简介:Analysisofforeshocksequenceofthe1975HaichengearthquakeofMs7.3Zhao-RongZUO(左兆荣);Jian-PingWU(吴建平)andZhi-LingWU(巫志玲)(Instituteof...
简介:ThegreatMs8.0Wenchuanearthquakehasbeenthemostdestructiveearthquakesince1949inChina.TheearthquakeoccurrednomorethanhalfayearaftertheestablishmentoftheNationalStrongMotionObservationNetworkSystem(NSMONS)ofChina;whatismore,theepicenterwaslocatedintheareawithdensestrongmotionobservationstationssothatalargenumberofstrongmotionrecordsofthemainshockwereobtained.Inthispaper,501strongmotionrecordsfrom167observationstationsareutilizedtoestablishthegroundmotionattenuationrelationsinthreedirectionsintherangeoffaultdistancelessthan600km.Theresultshowsthedifferenceofseismicmotionattenuationintwohorizontaldirectionsisinsignificant.Itisthefirsttimethatstrong-motionrecordsareusedtoestablishthegroundmotionattenuationrelationsoftheMS8.0earthquakeinChina.
简介:目的:研究苔类植物石地钱中具有微管抑制活性的大环双联苄类化合物。方法:在具有微管抑制活性的石地钱提取部分中,利用LC-DAD/MS/MS方法检测其中的大环双联苄,通过制备高效液相分离和纯化此类化合物、光谱方法鉴定其结构,利用稳定表达EYFP—tubulin的HeLa细胞株考察其抑制微管活性。结果:LC—DAD/MS/MS检测到11个双联苄类化合物,经分离纯化得到其中8个并鉴定为:异地前素C(1)、片叶苔素C(2)、新地前素A(3)、地前素A(4)、异片叶苔素C(5)、片叶苔素B(6)、羽苔素E(7)和地前素C(8)。化合物4和8具有显著的抑制微管解聚活性。结论:化合物3—7均为首次从该植物中分得,并首次报道联苄类化合物具有微管抑制活性。
简介:HighresolutionmassspectrometryincombinationwithdistillationandSARAfractionationprovidesusanopportunityforin-depthunderstandingaboutthehydrotreatingprocessatthemolecularlevel.Inthisstudy,theatmosphericresiduederivedfromArabianheavycrudeanditshydrotreatedproductswereinitiallysubjectedtodistillationandSARAfractionation.ThesaturateswerecharacterizedbyGCFI/FDTOFMS.ThearomaticsandresinswerecharacterizedbyAPPIFT-ICRMS.Compositionalchangesofdifferentcompounds(paraffins,naphthenes,aromatichydrocarbons,andheteroatomiccompounds)containedindifferentdistillates(vacuumgasoil,vacuumresidue)wereobtained.Moredetailedknowledgeaboutthehydrotreatingprocesswasachieved.
简介:目的建立尿液中扎来普隆和5-氧-扎来普隆的液相色谱-串联质谱检验法。方法尿液用乙腈直接沉淀蛋白并通过96孔板去磷酯后,选用ZORBAXEclipsePlusC18色谱柱,以0.1%甲酸水(A相)和乙腈(B相)作为流动相,进行梯度洗脱分离。采用液相色谱-串联质谱仪的电喷雾电离,正离子模式扫描、多反应监测(MRM)模式检测扎来普隆及5-氧-扎来普隆,并用外标法定量。结果该方法可有效分离尿液中的扎来普隆及5-氧-扎来普隆,保留时间分别为2.48min和1.96min,样品检验时间仅需4min。尿液中扎来普隆及5-氧-扎来普隆分别在0.1~50ng/mL和0.25~50ng/mL范围内线性关系良好,回归方程分别为y=70393x+33700和y=34491x+16854,检出限分别为0.05ng/mL和0.1ng/mL。扎来普隆及5-氧-扎来普隆的回收率均在90%以上,日内与日间精密度均小于10%。结论本文所建方法简便、快速、分离度好,适用于尿液中的扎来普隆和5-氧-扎来普隆检测。