简介：GinsenosidesRg1,Re,Rb1,Rc,Rb2,Rb3,andRdindifferentpartsoftheAmericanginsengplantwereinvestigated.Theextractionprocesswasapressurizedmicrowave-assistedextraction(PMAE).Thesevenginsenosideswereseparatedanddeterminedbyhigh-performanceliquidchromatography(HPLC)withaultraviolet(UV)detector,at203nm.TheexperimentresultsshowedsignificantvariationsintheindividualginsenosidecontentsoftheAmericanginsengindifferentpartsandagesoftheplant.Theresultsdemonstratedthattheleaves,roothairs,andrhizomesofPanaxquinquefoliusL.containedhigherginsenosidecontents,followedbythemainrootsandstems.TheleavescontaineddramaticallyhigherlevelsofginsenosideRg1,Rb3,andRdthantheotherfourparts.HighercontentsofRb1andRewerepresentinthemainroots,roothairs,andrhizomes.Theamountofginsenosidecontentinthestemswasthelowest.Thetotalcontentofthesevenginsenosidesinmainroots,roothairsandrhizomesincreasedwiththeageoftheplant.Incontrast,theginsenosidecontentsintheleavesandstemsdecreasedwithayearofgrowth.

简介：Studyonbiotinylationstrategiesforcompetitiveimmunoassayofestradiol(E2)wascarriedout.Twotypesofcompetitiveenzymeimmunoassay(EIA)withBiotin-Avidinamplificationsystemwereestablishedandoptimized.TheE2-Biotinconjugatewasusedasatracerinoneassay,andbiotinylatedantibodywasusedasatracerintheother.InbothofEIAs,horseradishperoxidase-labelledAvidin(Avidin-HRP)wasusedwithaspectrometricdeterminationofenzymeactivity.Theprecision,sensitivityandspecificityweremeasuredandcompared.Theresultsshowedthatalthoughbothweresatisfactoryinspecificity,theEIAwithhapten-BiotinshowedtobesuperiortotheEIAwithbiotinylatedantibodyinsensitivityandprecision.ThelimitofdetectionofserumE2was8and50pg/mLwithE2-Biotinandbiotinylatedantibodyastracer,respectively.

简介：

简介：Several2.0wt%nickelcatalystssupportedonnanometerbimodalmesoporousaluminosilicate(NBMAS),AlHMSandAlMCM-41werepreparedbymeansofthewetnessimpregnationmethod.ThecharacterizationtechniquessuchasPy-FTIRandH2chemisorptionshowedthattheamountofBronstedacidsitesdecreasedintheorderofNi/A1HMS>Ni/AlMCM-41>Ni/NBMAS,whilethenickeldispersiondifferedalittle.Inthecatalyticn-dodecanehydroconversion,thehighestconversionwasobtainedoverNi/NBMAS,andthelowestisomerizationselectivityoccurredoverNi/A1HMS.Forthecrackedproducts,thesymmetricalcarbonnumberdistributioncenteredatC6wasobtainedontheNi/AlMCM-41catalystduetothewellbalancedmetal/acidfunctions,whereastheNi/AlHMSandNi/NBMAScatalystsledtomoreC3-C5andC1+C11products,respectively.

简介：Lens-likevateriteCaCO3microringscomposedofCaCO3nanoparticlesweresynthesizedviaamicro-emulsion-mediatedrouteatroomtemperaturewithethanolandn-hexanolasco-surfactant.Thisprocessdidnotde-mandanyadditionalenergysuchasheatingorcontinuousagitation.Itwasthefirsttimetouseethanolasco-surfactantinthesynthesisofmicroornanomaterials.AndtheethanolwasbelievedtoplayanimportantroleintheaggregationfashionofCaCO3nanoparticles.Moreover,shuttle-shapednanorods,hexagonalnanoplates,andrice-likenanoparticleswerealsofabricatedbymodulatingthegrowthparameters.Additionally,theintroduceofethanolintomicroemulsionsasco-surfactantmaybegeneralizedasanovelgreenroutetocontrolthestructureofotherfunctionalmaterials.

简介：Introduction　　PanaxquinquefoliumL.BelongstothePanaxgenusoftheAraliaceae.ItoriginatesinAmericaandCanada.Itsroots,afamousandexpensivetraditionalChinesemedicinalmaterial,havebeenstudiedcontinuallysinceitssuccessfulcultivationinChinainthe1970s.Inrecentyearsthedevelopmentandutilizationresearchesofitsaerialpart,whichwasabandonedinthepast,havebeenconducted.Theconstituentstudiesontheleaves,stemsandfruitshavebeenreported.Butnoinformationabouttheflowerbudshasbeenfoundinliteratures.TheauthorshavereportedastudyaboutthechemicalconstituentsoftheflowerbudsoftheP.QuinquefoliumcultivatedinChina.Inthepresentworktwoflavonoids(namelykaempferolandpanasenoside)intheflowerbudsoftheP.QuinquefuliumcultivatedinChinawereextracted,isolated,andidentified.Sincethemedicinalmaterialswereprocessedwithanunusualtreatment,thecontentdeterminationofthemonomericandtotalflavonoidinthedifferentpartswereperformedcorrectlywiththemethodsofdual-wavelengthTLC-scan,andUV-absorption,anditwasdiscoveredthattherewereflavonoidsintherootsandfruitsoftheP.Quinquefolium.ThescientificbasiswasprovidedfortheutilizationoftheflowerbudsandotherpartsresourcesoftheP.

简介：一个简单正面的分析方程将决定不同吸附物上的溶质分子的吸附参数被介绍。它给在平均突破时间和feed溶质集中之间的关系，并且由使用它的线性形式，二个重要参数，为吸附物的表面和全部的吸附地点的数字nt上的溶质吸附的热力学的平衡常数KSL在吸附物的表面上散布了，能同时坚定。为RP-C18反向阶段的媒介上的一些芳香的烃的正面的分析，和RP-C18上的一些蛋白质分子反向阶段，WCX-1阳离子交换，恐水病的PEG-400和Che1atingSepharose快流动独立有Zn2+或Cu2+媒介的chelated，独立被执行测试这个方程和他们的吸附参数KSL，nt独立被获得。结果证明所有这些正面的分析数据能被这个正面的分析方程很好描述。为所有这些正面的分析系统，他们的参数nt能近似独立保持不变，他们独立于使用的溶质分子，当他们的参数KSL依赖于两在正面的分析列和溶质包装的媒介时，分子使用了。

简介：Inthispaper,withK+,Ca2+andFe3+astheobjectsofstudy,retardationofsoil–bentonite(SB)barriermaterialsformetalionswithdifferentvalencesisinvestigated,andtheadsorptionmechanism,migrationpatternsandpermeationbehaviorareexploredsoastoprovideatheoreticalbasisfortheirapplication.TheresultsshowthattheadsorptionprocessformetalionswithdifferentvalencesbySBbarriermaterialsisfast,andthehigherthevalence,thegreatertheadsorptioncapacity.Thefttingoftheadsorptionprocessconformstopseudo-second-orderadsorptionkineticsandLangmuir–Freundlichadsorptionequation,whichexplainsthatchemicaladsorptionisthedominatingstateandthattheSBsurfacehascertainheterogeneity.ThepermeabilitycoeffcientofK+,Ca2+andFe3+inSBeachhasamaximumandthehigherthevalence,thesoonerthemaximumappears.Alsothehigherthevalence,themoreobvioustheeffectonSBretardationperformance;andthesoonertheionbreaksthroughthebarrierwallcompletely,thatis,thewall’sretardationperformanceforhighervalentionsmaydecline.

简介：Li0.33MnO2cathodematerialwassynthesizedbysolidstatereaction.Thematerialshowedasmallcoherentdomainsizeabout10nmdeterminedbyX-raydiffractionandtransmissionelectronmicroscopy.Theelectrochemicalpropertiesofthematerialwerestudiedindifferentpotentialwindowsof3.5―2.0Vand4.3―2.0V.Anirreversibletransformationtospinelphasewasobservedintheinitialseveralcycles,whichwasmoreprominentoncyclingat4.3―2.0V.ElectrochemicalimpedancespectroscopyshowedthattheLi+diffusioncoefficientofthematerialwasabout2×10–9cm2/s.Li0.33MnO2showedareversibledischargecapacityof140and200mA·h/ginthepotentialwindowsof3.5―2.0Vand4.3―2.0V,respectively.Butthecapacityretentionat4.3―2.0Vwaspoorduetothethickerspinellayerformedonthematerialsurface.

简介：Thecomparisonofsolidphaseextraction(SPE)forthepreconcentrationandisolationofpolyphenolsintobaccosampleswascarriedoutbyultra-highperformanceliquidchromatography/tandemmassspectrometry(UPLC/MS/MS)andmultivariateanalysis.SeveraladsorbingmaterialsofSPE(C18,NH2,SAXandOASIS)wereinvestigated.ItwasfoundthattheC18andOASIScartridgescannotonlyspeedupthepurificationprocess,butalsosimplifytheSPEoperation.AUPLC/MS/MSwasusedforthedeterminationofpolyphenolsintobaccosamplesafterpurification.Allanalyteswereseparatedanddeterminedin2min.Thelimitofdetectionwas0.05ng/mL.Clusteranalysis(CA)andprincipalcomponentanalysis(PCA)wereusedfortheanalysisof4varieties(flue-curedtobacco,orientaltobacco,sun-curedtobaccoandburley)inordertointerprettheeffectofplantingandmachiningprocessontheconcentrationofpolyphenols.ThedifferenttypesoftobaccosamplescouldbeeasilyclusteredbyCA.PCAonthechemicalcompositionoftobaccoresultedintwoprincipalcomponents(PCs)thattake84.2%ofthetotalvariance.ThePCAandCAindicatethatthepolyphenolscanbeusedfordistinguishingtobaccotypes.

简介：CarbonmonoxideoxidationonPd(10w.t.%)-aluminawasstudiedbyin-situinfraredspectroscopy.ItwasfoundthattheoxidationreactivitiesvarywithdifferentCOadspecies:linearCOad>2-foldbridgedCOad>multi-bridgedCOad.

简介：在n-C5H11OH/H2O=50/50的重量比率，当钠dodecyl硫酸盐(SDS)的全部的内容是不到6.0%时，SDS/n-C5H11OH/H2O的第三的混合在二不能混合的微乳液共存了。在二个阶段之间的gatifloxacin(GTFX)的分发和转移被学习用紫外力并且电气化学交流阻抗系列。结果证明GTFX从上面的阶段(W/O)转了到更低的阶段(O/W或bicontinuous微乳液)，吗但是SDS的小数量在1.0畲獧的全部的GTFX集中随全部的SDS内容的增加相应地从更低的阶段转了到上面的阶段？