简介:Thispaperreportsthedevelopmentandvalidationofanassayforthedeterminationofacetonitrileintherecycledmobilephaseusinghighperformanceliquidchromatography(HPLC).Themethodisbasedonthattheretentioninreversed-phaseliquidchromatographyincreaseswithdecreasingconcentrationoforganicphaseinthemobilephase.Thenaturallogarithmofthecapacityratioforagivensoluteislinearlyrelatedtothevolumefractionoftheorganicmodifierinthemobilephase.Fordimethylphthalateanddiethylphthalate,thelinearityrangeis30%―60%,andforbiphenylandterphenyl,therangeis60%―95%.Precisionvalues(RSD)wereboth<1%andtheaccuracy(RE)wasintherangeof±1%.Theassaywassuccessfullyappliedtothedeterminationofacetonitrileconcentrationofrecycledmobilephaseafterthedistillationofthecolumneluentinourlaboratory.
简介:摘要目的建立人血中茶碱的HPLC测定方法,开展茶碱血药浓度检测。方法采用反相色谱法,色谱柱为HypersilODS2依利特,检测波长为274nm,流速1ml/min,温度30℃,对流动相、内标、提取方法进行考察。结果确定用高氯酸处理血样,流动相为甲醇水=2575,内标物为咖啡因达到良好的分离效果。茶碱标准曲线回归方程为Y=0.0735X+0.0373,r=0.9992(n=8),线性范围为0.7353~29.4118μg/ml。茶碱低、中、高血药浓度的日内RSD%均<3,日间RSD%均<5。结论本测定方法简便、灵敏、快速、准确,在临床应用中能最大限度地降低茶碱毒副作用,产生较佳的治疗作用。
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:摘要:目的:利用高效液相色谱法 (HPLC)测定布洛芬片中布洛芬的含量。方法:采用安捷伦 1200色谱系统,色谱柱为 Venusil MP C18柱 (4.6mm×250mm,5μm), 流动相为乙腈 -pH2.6 的醋酸钠 (体积比为 50:50,含醋酸钠 0.82,用冰醋酸调节 PH值至 3.0±0.05),检测波长为 263nm,流速为 1.0ml/min。结果:布洛芬在 0.55μg/m1~15.23μg/ml 范围内呈良好线性关系,相关系数为 0.9999,平均回收率为 96.22%, RSD=3.9%。结论:利用高效液相色谱法 (HPLC)测定布洛芬片中布洛芬的含量,操作简单,灵敏度高,专属性强,准确可靠,可用于布洛芬片的质量控制。