蛋白质含量测定方法

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  蛋白质含量测定方法,810015:、,。、、、、、。,。:;;;;;,、[1]。,、(Biuret)。,,(Bradford)[4]。,Bradford,10~20,Biuret100。,,。3,4,4。,[3]。:(1);(2);(3);(4)。4、、,。,,。1 1.1 仪器材料(1):、、、、、。(2):、、、0.12molLpH=4.7-、-、H2SO4、40%、30%、2%、0.050molL、-、、、、G-250。1.2 实验方法(1),(),,。,CuSO4K2SO4,30%。,,,,。,27220076      TheScienceandTechnologyofGelatinVol.27.No.2Jun.2007.。(2),、,,280nm,()。,238nm。,,。、、,,。,,(NH4)2SO4,,,。,,,,。、,。,。,,。,,pH,pH,pHpH。0.1~1.0mgmL,,。3,。(3)(NH3CONHCONH3)180℃,。,CuSO4,。,,。,,。  ,,;。,。1~10mgmL,30min,,。3·99·272:,。(4)(Biuret),1976Bradford(Bradford),。,。。Bradford:a.。,Lowry4,1mg。,-,Lowry。b.、,。,5min。,2min,1h,5~20min,,Lowry。c.。LowryK+、Na+、Mg2+、Tris、、、、EDTA。:a.,Bradford,γ-,。b.,:、TritonX-100、(SDS)0.1NNaOH。(0.1NLowry)。c.,Beer,。G-2505min,,。3,。2 2.1 实验结果1 3.092.130.81--2.883.162.160.913.112.180.862.2实验结果分析(1)3,,,,,。(2)、,,。,,,。(3)3,,,1~20mgmL。,1~20mgmL。(4)3,、,,0.1~1mgmL,1h,。3 4。·100·      20076    (Kjedahl),0.2~1.0mg,±2%。,8~10h。,。()。;;。(Biuret),1~20mg,20~30min。+Cu2+※。;Tris;,;。,50~100μg,5~10min。280nm。;。;。(Bradford),1~5μg,5~15min。,λmax465nm595nm。;Tri-tonX-100;SDS。;;;。   1 .[J].陕西农业大学学报2006:132~1342 、.生物物质常用化学分析法[M].:,1982:93~993 、、.生化实验方法和技术[M].:,1981:164~1694 BradfordM.Anal.Biochem.1976,72:248TheVariousMethodsforDetermingDifferentProteinsYangYufangQinghaiBrightApricotBio-engineeringCo.Ltd.,Xining,Qinghai,China,810015Abstract:Theproteinsareconnectedwiththelifeorigin,theexistenceandevolutionclosely,andthedeterminationofpro-teincouldservetotheproductionandthescientificresearch.Theconcentrationsofproteinofmilk,yogurt,andsoybeanmilkaredeterminedbythemethodsofKjeldahl,UVspectrophotometry,BiuretreactionandCoomassiebrilliantblue,andthevariousmethodsarecomparedandsummarizedfromtheresultsinthispaper.Keywords:Kjeldahl;UVspectrophotometry;Biuret;Coomassiebrilliantblue;Protein;Determination.·101·272:

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