简介:摘要:随着建设工程技术发展和环保理念的影响,建筑行业逐渐采用定制化工具,在建筑加固体系中如框架柱加固多采用穿柱对拉螺杆加固与无对拉螺杆加固两种。基于此,本文通过阐述无穿柱加固技术的发展历程和必要性,对比分析对拉螺杆式和无对拉螺杆式两种加固技术,以期在建筑工程中积极使用无穿柱对拉螺杆式加固工艺尤其是定制化加固工具,在达到良好的工程质量的同时,可以提高经济效益和环保效益。
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.