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1、酵母高產(chǎn)Y■氨基丁酸發(fā)酵條件的優(yōu)化STUDIESONFERMENTATIONCONDITIONSFORTHEPRODUCTIONOFGABAFROMSACCHAROMYCESCEREVISIAESTRAIN目錄摘要1關(guān)鍵詞11前言22材料和方法42/I材料42.1.1菌種42.4.2培養(yǎng)基42.1.3主要的藥品和設(shè)備42.2實(shí)驗(yàn)方法4221菌種活化4222種子培養(yǎng)4223發(fā)酵液屮Y-氨基丁酸的含量測(cè)定5224培養(yǎng)基優(yōu)化5225發(fā)酵條件優(yōu)化53結(jié)果與分析63.1發(fā)酵液中丫?氨基丁酸的含量測(cè)定63.2培養(yǎng)基的優(yōu)化6321碳源對(duì)菌體發(fā)酵的影響63
2、22有機(jī)氮源對(duì)菌株發(fā)酵的影響73.2.3無(wú)機(jī)氮源對(duì)菌株發(fā)酵的影響8324無(wú)機(jī)鹽對(duì)菌體發(fā)酵的影響93.2.5培養(yǎng)基組成的優(yōu)化103.3發(fā)酵條件的優(yōu)化113.3.1初始pH對(duì)發(fā)酵113.3.2培養(yǎng)溫度對(duì)發(fā)酵的影響113.3.3搖床轉(zhuǎn)速對(duì)發(fā)酵的影響123.3.4種齡對(duì)發(fā)酵的影響123.3.5接種量對(duì)發(fā)酵的影響13336培養(yǎng)時(shí)間對(duì)發(fā)酵的影響133.3.7優(yōu)化發(fā)酵條件下菌株產(chǎn)Y-氨基丁酸特性鑒定144討論145結(jié)論15參考文獻(xiàn)15致謝17酵母產(chǎn)Y■氨基丁酸發(fā)酵條件的研究學(xué)生:吳輝指導(dǎo)老師:黃麗華(湖南農(nóng)業(yè)大學(xué)東方科技學(xué)院,長(zhǎng)沙410128)摘要:Y?
3、氨基丁酸(GABA)是一種具有許多生理功能的非蛋白氨基酸,主要通過(guò)微生物發(fā)酵生產(chǎn)。木論文以誘變獲得的高產(chǎn)Y—氨基丁酸酵母菌株為材料,對(duì)其發(fā)酵生產(chǎn)Y—氨基丁酸的培養(yǎng)基成分和培養(yǎng)條件進(jìn)行了探討。結(jié)果表明,發(fā)酵的合適培養(yǎng)基為3%葡舖糖,3%蛋白腺,0.3%(NH4)2SO4和0.1%KH2PO4;適宜的搖瓶發(fā)酵條件為:培養(yǎng)溫度30°C,培養(yǎng)基起始pH值為5.5,搖床轉(zhuǎn)速220r/min,接種量4%,種齡為2d的種子菌,培養(yǎng)時(shí)間4d。在此發(fā)酵條件下,變異菌發(fā)酵液中Y?氨基丁酸含量可達(dá)2.590g/Lc關(guān)鍵詞:酵母;Y?氨基丁酸;發(fā)酵條件Studie
4、sonFermentationConditionsfortheproductionofGABAfromSaccharomycescerevisiaestrainStudent:WuHuiTutor:HuangLiHua(OrientalScience&TechnologyCollegeofHunanAgriculturalUniversity,Changsha410128)Abstract:Gamma-aminobutyricacid(GABA)wasannon-proteinaminoacidwhichplayedanimportsntr
5、oleinthephysiologicalactivities?AlargenumberofGABAproductswereproducedbythemicroorganismfermentation.Inthispaper,thefermentationconditionsforGABAproductionbySaccharomycescerevisiaestrainweretestedinshaking?flaskculture.Somefactorssuchascarbonsources,nitrogensources,inorgan
6、icsalt,initialpH,cuturetemperatureandtime,rotationspeed,seedage,andsoon,affectedtheproductionofGABA.Theoptimalculturemediaare:3%glutathione,3%peptone,0.3%(NH4)2SO4,0.1%KH2PO4;Theoptimalfermentationconditionswereasfollows:initialpH5.5,cuturetemperature30°C,rotationspeed220r
7、/min,seedage2d,inoculumsize4%andculturetime4d」nthiscondition,theyieldingcapacityofGABAbythemutantwas2.590g/l?Keywords:Saccharomycescerevisiaemutagenicity;Gamma-aminobutyricacid(GABA);fermentationconditionsY■氨基丁酸(y-aminobutyricacid,GABA),乂名4■氨基丁酸(4-Aminobutanoicaid,4-AB),Y?
8、氨酪酸,是以游離態(tài)或結(jié)合態(tài)存在于植物、動(dòng)物、細(xì)菌、真菌、藻類、鋒類、蕨類等生物體中的一種非蛋白質(zhì)氨基酸,其結(jié)構(gòu)式如圖1所示⑴。GABA在脊椎動(dòng)物中樞神經(jīng)系統(tǒng)中作為一種重要的抑制性