资源描述：
《减压提取丹参等三种中药化学成分的研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、山东师范大学硕士学位论文temperature50℃,extractiontime1.0hour.Usingthesameextractionagents,theratesofsalvianolicacidBandDPPHfreeradicalscavengingratewereequivalentcomparedwithvacuumextractionandheatrefluxextraction.Atthesametime,theextractionrateofsalvianolicacidB,DPPHfreeradicalscavengingrate,theext
2、ractyield,contentsofproteinandsolublesugarofextractsbyvacuumextractionwerehigherthanthatbyultrasonicextractionandwarmimmersion.Andtheextractyield,contentsofproteinandsolublesugarofextractsbyvacuumextractionwerelowerthanthatbyheatrefluxextraction.InviewofthehigherrateofsalvianolicacidB,th
3、eclearerextractandthelessimpurity.vacuumextractionofSalviamiltiorrhizaBge.isbetterthanconventionalextraction.ThedriedrootandrhizomeofPolygonumcuspidatumSieb.etZucchavetheeffectalleviatingrheumatism,removebloodstasis,andstimulatethemenstrualflow.Resveratrolisoneofmajorfunctionalcomponents
4、,whichcanreducetissueandorgandamagecausedbyavarietyoffactors,protecttheliver,hypolipemicandanti-lipidperoxidation.Theoptimalconditionsofvacuumextractionwereethanolconcentration70%,ratioofsolidtoliquid1:10,vacuumdegreeof0.07MPa,temperatureof50℃andextractiontimeof1hour.Comparedwithheatrefl
5、uxandultrasonicextractionmethods,vacuumextractionhashigherresveratrolyield,transmittance,DPPHradicalscavengingrateandlowerextractyield,lowercontentofprotein,solublesugarandotherimpurities.Theresultsshowedthatitissuperiortootherextractmethods.CurcumalongaL.iscommonlyrecognizedasapharmaceu
6、tical/foodresource.ThemajoractiveconstituentsofCurcumalongaL.arenaphthaandcurcuminoids.Curcumin,demethoxycurcuminandbisdemethoxycurcumin,whichareclassifiedtocurcuminoids,arethemajoractivecomponentsofCurcumalongaL.Inthestudy,weevaluatetheeffectsofthreefactorsontheextractionyieldsofcurcumi
7、noidsunderdifferentsolvents,extractiontimeandsolid/liquidratio.Theoptimalextractionconditionsofvacuumextractionwere:ethanolconcentration70%,ratioofsolidtoliquid1:15,vacuumdegreeof0.07MPa,temperature50℃,extractiontime1.0hour.Undertheoptimizedconditions,theextractionyieldso
