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ID:36527230
大小:2.16 MB
页数:58页
时间:2019-05-11
《食用级L—乳酸分离精制工艺的研究》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、食用级L--喾t,酸分离精制工艺研究揍要乳酸广泛应用于化工、食鼎和医药等领域,市场前景广阔。但用于食品和医药学照孛豹巍酸不仅要求其褥型为L.型,蠢且光学纯发舞、杂震含豢少、稳定毪妻孑。目前国斑外主要琢发酵法生产L。乳酸,其分离提取工艺复杂,产品收率低,经济效益不商。论文开展了以鞋+薯淀粉为磺源,采用米稷霉菌株As3。819发酵生产毛一乳酸的分离纯仡工艺磷究。针对西簿豳痰L.季0酸分离精翻生产技术中存在酾主要润题,对传统钙盐提取工艺进行了探索改进。设计提出了采用截留分子量为5000道尔顿的超滤膜去除缳白、颗粒状活性炭和AB一8大孔吸附树脂联合脱糖脱色、嚣酸键撵疫降温络鼓等除杂
2、缝亿王芝,建立了缝优工艺中主要组分疆礁硬捷戆分析稔测方法,考焱了各个工序的关键影响黼索,在此蕊础上选择优化出食用级L-乳酸分离精制的工艺路线和最佳操作参数。实验结果表骥:菠曩l颗粒龋瞧炭藤AB一8大孔吸黪穗g翼避行麓糖聪惫,嚣酸的损失率仅为7。8%,远低于传统工艺中采用擎一粉末活性炭重复处理所遗成韵20~30%乳酸损失率,能去除绝大部分残糖和德索杂质;运用超滤膜技术处理发酵液,摄白去除率可达91.56%,L.乳酸的损失率为2%,与日前乳酸分离稽制工艺中濒采矮羲热热碱调、添攘絮凝裁豫蛋囊工艺程澈,吴有赘显优癸;采爰梯度降温和晶种诱导进行乳酸钙结晶技术,结晶率可达67.46%,
3、对母液回收后可进行再次结晶。经过我讫缝合瓣食爰级t一嚣酸分离耱裁:£艺合理,搽捧篾单,各王序连续性较好,L一乳酸提敬率可达7096以上,经纸朦析及对戏晶L哥L酸旋光性检测的结果表明,其L-乳酸含量为90%、光学纯度为95%,产品稳定性较好。关键溺:L.襄羧麓裁、超滤、绫鑫、鬏装溪,陡炭、大孑L趿瓣瓣嚣StudyontheSeparationandPurificationProcessofFood--gradeL·-lacticAcidAbstractLacticacidanditsderivatives,widelyusedinthechemical,food,pharma
4、ceuticalindustries,arepromisingproducts.Forfoodandpharmaceuticalpurposes,however,withhighopticalpurityL—lacticwithlowercontentofimpuritiesarerequired.Currently,L.IacticacidiSmainlyproducedbyfermentationmethod,whichsufferssomedifficultiessuchascomplexsepar撕onprocess.poorrecoveryrateandlowef
5、ficiency.Thisthesisfclcusedonthedownstreampurificationprocessof1acticacidproducedbyRhizopusoryaze3.819fromsweetpotatostarch.Forlacticacidclarificationandpurification,aseriesoftechnologieswereintroduced,whichcoveredultrafiltrationmembranewith5000Dretentionmolecularweightforproteinremoval.pa
6、rticleactivecharcoaiincombinationwithmacroporousAB一8resinforsugarandpigmentsremoval,andgradualtemperaturedecreaseforcalciumlactatecrystallization.Firstly,fastandaccurateassaysrelatedtopurificationprocesswereestablishedforthemaincomponentsanalysis.Secondly.thekeyfactorsineveryprocesswerefur
7、therresearched.Finally.theprocessoffood—grade1acticacidanditsparameterswereoptimized.Theresultswereasfollows:byusingparticleactivecharcoalandAB一8macroporousadsorbentresinforcolorandsugarremoval.thelOSSrateofcalciumlactateintheprocesswasonly7,8%.whichwasmuchlow
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