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ID:23196546
大小:3.98 MB
页数:64页
时间:2018-11-05
《不同植物来源纤维素酶解产糖中构效关系及预处理影响研究》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、华中农业大学2014届硕士研究生学位论文miscanthus>waterpeanut>metasequoiachips.Inanyofthecellulaseloadings(7—200FPU/gcellulose),cellulosefrommetasequoiachips、^,itllthehighestcrystallinityindexhadtheminimumreducingsugaryield(20—60∥1009),meanwhile,thesugarcanebagassecellulose谢tllthelowestcrys
2、tallinityindexhadthemaximumreducingsugaryield(>85.72g/1009).Thehigherthecrystallinityindexwas,thehigherdegreeofcrystallizationwouldbe,andthemoredifficultthecombinationofenzymeandcelluloseWas,leadingtoalowercelluloseconversionandalowerreducingsugaryield.Anobviousnegativeco
3、rrelationbetweenCrIandhydrolysisyieldwasobtained、析tllthelinearcorrelationcoefficientRashighasO.9828,atsufficientlyhighenzymeloadingsof140and200FPU/gcellulosewheretheenzymeavailabilitywasnotalimitingfactorofthehydrolysisreaction.(3)Itwasfoundthatthecrystallinityindex(CrI)o
4、fplantcelluloseplayedagreaterrolethandegreeofpolymerization(DP)andspecificsurfacearea(SSA)did,inenzymehydrolysisbythemultiplelinearregressioncorrelationequationfittingbetweenthereducingsugaryield(Ⅵandstructuralcharacteristics(CrI,DP,SSA),meanwhile,theDPandSSAonlypresented
5、aminordegreeofpositivecorrelation、析tllthereducingsugaryield,thushadaminorinfluenceonthehydrolysisofplantcelluloses.TheinfluenceofstructuralcharacteristicsonenzymatichydrolysisWasintheorderofCrl>DP>SSA.Thispointstothepotentialadvantagesinpracticalapplicationofutilizingwate
6、rhyacinthasfeedstockforbio—ethanolproductionasithasrelativelylowCrIandrelativelyhighSSA.Whenwaterhyacinthisappliedtoenzymatichydrolysis,itCannotonlyreducethecostofenzymereagentaswellasthecostofbio-ethanolproduction,butalsocontroltheaquaticenvironmentalproblems.(4)Differen
7、tintensityofphosphoricacidandmicrowavepretreatmentswereemployedtowaterhyacinthcelluloseseparatedbyethanol—nitratemethodinordertochangeitsstructttralfeature.TheSSAofthepretreatedmaterialsdecreasedsignificantly,andthereducingsugaryieldsofthesematerialswerealsolowerthanthose
8、ofuntreatedcellulose.Therefore,waterhyacinthcelluloseseparatedbyethanol—nitratemethoditselfwasal
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