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《漆酶-超聲波協(xié)同處理堿木質(zhì)素的表面化學(xué)結(jié)構(gòu)特征-論文.pdf》由會員上傳分享,免費在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、第34卷第4期林產(chǎn)化學(xué)與工業(yè)Vo1.34No.42014年8月ChemistryandIndustryofForestProductsAug.2014doi:10.3969/j.issn.0253—2417.2014.04.015漆酶.超聲波協(xié)同處理堿木質(zhì)素的表面化學(xué)結(jié)構(gòu)特征連海蘭,程明娟,洪樞,詹先旭(1.南京林業(yè)大學(xué)木材工業(yè)學(xué)院,江蘇南京210037;2.德華兔寶寶裝飾新材股份有限公司,浙江湖州313200)摘要:分別采用超聲波、漆酶及超聲波協(xié)同漆酶的方法處理麥草堿木質(zhì)素,通過化學(xué)分析法結(jié)合紅外光譜、x射線光電子能
2、譜和電子自旋共振等儀器分析手段,對比各處理過程木質(zhì)素酚羥基含LIANHai.1an量、表面官能團、表面元素及表面自由基的變化,探討3種處理方式對堿木質(zhì)素結(jié)構(gòu)的影響機理。結(jié)果表明,超聲渡處理后的木質(zhì)素,總酚羥基含量比未處理的有所增加,漆酶處理后酚羥基含量減少。與未經(jīng)處理的純堿木質(zhì)素相比,木質(zhì)素經(jīng)超聲波處理后自由基濃度減少了38%,而漆酶處理后自由基濃度顯著增加,其中單一漆酶處理增加了l12%,超聲波后再進行酶處理增加了193%。超聲波空化作用可使木質(zhì)素發(fā)生脫甲氧基反應(yīng)及連接鍵斷裂;漆酶處理過程中有解聚反應(yīng),同時酚羥基氧化
3、變成苯氧自由基,進而發(fā)生自由基反應(yīng);超聲波后生成的木質(zhì)素小分子更易與漆酶反應(yīng),c一0單鍵被氧化。關(guān)鍵詞:超聲波;漆酶;堿木質(zhì)素;結(jié)構(gòu)特征中圖分類號:TQ35文獻標(biāo)識碼:A文章編號:0253~417(2014)04-0090-07SurfaceChemicalStructureofAlkaliLigninModifiedbytheSynergisticProcessofLaccaseandUltrasoundLIANHai—lan,CHENGMing-juan一,HONGShu,ZHANXian.XU。(1.Colleg
4、eofWoodScienceandTechnology,NanjingForestryUniversity,Nanjing210037,China;2.DehuaTBDecorationMaterialCo.,Ltd.,Huzhou313200,China)Abstract:Wheatalkaliligninwastreatedbyultrasound,laccase,andthesynergisticprocessofultrasoundandlassase,respectively.Thechemicalstruc
5、tureofwheatalkaliligninaftertreatmentwasthencharacterizedbythecontentofphenolichydroxyl,infraredspectroscopy,X—rayphotoelectronspectroscopy(XPS)andelectronspinresonance(ESR).Theresultshowedthatcomparingwiththeuntreatedlignin,thetotalphenolichydroxylcontentincrea
6、sedafterultrasonictreatment.However,itdecreasedafterlaccasetreatment.Thenumberofspindecreasedby38%afterultrasonictreatment,butitincreasedsignificantlyafterlaccasetreatment.Particularly,thenumberofspinincreasedby112%afterthesingletreatmentbylaccase.Thenultrasonic
7、waveandlaccasewereappliedtotreatthesampleinsequence.Thisresultedintheincreaseofthenumberofspinby193%.Inthesecases,ultrasoniccavitationcaninducethedemethylationandcleavageofsomelinkagesinlignin.Laccasewasabletopromotedepolymerization.Atthesametime,phenolichydroxy
8、linligninwasoxidizedandgeneratedphenoxyradicalsforfreeradicalpolymerizationduringtheprocessoflaccase-catalyzedoxidation.Smallmoleculeligninobtainedafterultrasonictrea