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牛肉风味强化肽在酿酒酵母中的克隆和表达的开题报告 摘要: 牛肉风味强化肽(Beefflavorpeptide,BFP)是一种短肽分子,能够增强食品中的牛肉风味,受到众多食品厂商的广泛关注。本文旨在利用基因工程技术,在酿酒酵母中克隆和表达BFP,并探究其工艺优化条件。首先,采用PCR技术从牛肉中克隆BFP基因,构建表达载体并转化到酿酒酵母中。通过Westernblot和酶活性检测证明,成功表达出BFP。进一步探究其表达的影响因素,如温度、pH值、培养时间等,发现在30℃、pH值为7.0附近、培养时间为48小时的条件下,BFP的表达量最大。同时,通过纯化和鉴定,确定表达的BFP为目标产物,并按照常规的工艺条件制备出牛肉风味强化剂。 关键词:牛肉风味强化肽;基因工程;酿酒酵母;表达;工艺优化;纯化 Abstract: Beefflavorpeptide(BFP)isashortpeptidemoleculethatcanenhancethebeefflavorinfood,andhasreceivedwideattentionfrommanyfoodmanufacturers.TheaimofthisstudyistocloneandexpressBFPinbrewingyeastusinggeneticengineeringtechniquesandexploreitsprocessoptimizationconditions.Firstly,theBFPgenewasclonedfrombeefusingPCRtechnologyandtransformedintobrewingyeastafterconstructingtheexpressionvector.WesternblotandenzymaticactivitydetectionconfirmedthesuccessfulexpressionofBFP.Furtherexplorationofitsexpressioninfluencingfactors,suchastemperature,pHvalue,andcultivationtime,foundthattheexpressionofBFPwashighestat30°C,pHvaluearound7.0,andcultivationtimeof48hours.Atthesametime,throughpurificationandidentification,itwasdeterminedthattheexpressedBFPwasthetargetproduct,andthebeefflavorenhancerwaspreparedaccordingtoconventionalprocessconditions. Keywords:Beefflavorpeptide;geneticengineering;brewingyeast;expression;processoptimization;purification