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时间:2020-04-22
《固定化脂肪酶合成3-TBDMSO戊二酸甲酯-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第42卷第7期化学工程V01.42No.72014年7月CHEMICALENGINEERING(CHINA)Ju1.2014固定化脂肪酶合成3-TBDMSO戊二酸甲酯王霞,董文明,陈雄飞,付雁(天津大学化工学院,天津300072)摘要:脂肪酶主要催化醇、酸、内酯的酯化反应,脂肪酶催化反应可在非水溶剂中进行,并且反应条件温和,被认为是制备单一对映异构体的有效方法。文中利用固定化脂肪酶Novozym435催化3-TBDMSO戊二酸酐不对称醇解制备3-TBDMSO戊二酸甲酯,通过高效液相色谱考察了不同反应条件对底物转化率、产物选择性的影响规
2、律。实验研究了四氢呋喃、乙酸乙酯、乙醚、甲基叔丁基醚和甲苯5种溶剂对酶催化反应的影响,结果表明:在甲基叔丁基醚溶剂中,Novozym435的催化效果最好。最优反应条件:温度25℃,酶质量浓度30mg/mL,醇与3-TBDMSO戊二酸酐摩尔比1.0,酸酐浓度100mmol/L,pH值为6.5,水活度0.66,反应时间6h。实验采用萃取的方法分离出反应产物,通过结晶纯化得到无色晶体,利用核磁氢谱证明产物为3-TBDMSO戊二酸甲酯,通过圆二色光谱说明合成产物为对映体过剩产品。关键词:他汀;脂肪酶;醇解;对映选择性中图分类号:TQ46文献标
3、识码:A文章编号:1005-9954(2014)07-0006-05DoI:10.3969/j.issn.1005-9954.2014.07.002Enzymaticsynthesisof3-(tert—butyldimethylsilyloxy)glutaricmethylmonoesterbyimmobilizedlipaseWANGXia,DoNGWen—yue,CHENXiong·fei,FUYan(SchoolofChemicalEngineering&Technology,TianjinUniversity,Tianjin
4、300072,China)Abstract:Lipase—catalysedreactionswereconsideredasaneffectivemethodtopreparepureenantiomers,basedontheesterificationofalcohol,acid,orlactoneinnon-aqueousphaseundermildreactionconditions.Anenzymaticalcoholysisof3一(tert_butyldimethyIsilyl0xy)glutaricanhydride
5、(3-TBDMSO—GA)withmethanolforpreparing3一(tert-butyldimethylsilyloxy)glutaricmethylmonoester(3-TBDMSO-GMM)wasstudiedusingimmobilizedLipaseNovozym435.Thedifferentsolventsincludingtetrahydrofuran,ethylacetate,diethylether,methyltert—butyletherandtoluenewereinvestigatedunder
6、mildconditions.Itshowsthatmethyltert-butyletheristhemosteffectivesolventinthealcoholysisreaction.Theeffectsofreactiontimeandtemperature,enzymeamount,wateractivity,substrateconcentration,molarratioofalcoholtosubstrateonthesubstrateconversionandtheselectivitywerestudiedus
7、ingtheanalysisofhighperformanceliquidchromatographywithC18column.Theoptimalreactionconditionswereasfollows:temperature25c【=,enzymemassconcentration30mg/mL,themolarratioofalcoholto3-TBDMSO-GA1.0,anhydrideconcentration100mmol/L,pH6.5,wateractivity0.66andreactiontime6h.The
8、productofcolorlesscrystalwasobtainedthroughextractionmethodfollowedbycrystallizationpurification.ByusingH—NMR.
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