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【求助】關(guān)于乙醇沉淀蛋白問(wèn)題,請(qǐng)各位幫忙
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最近想用乙醇沉淀蛋白,看到文獻(xiàn)上寫加預(yù)冷的無(wú)水乙醇至乙醇濃度為70%(v/v),如果我有100ml蛋白粗提液,該加入多少乙醇才能使乙醇濃度達(dá)到70%?請(qǐng)各位幫忙解答,謝謝 附:文獻(xiàn)原文 The supernatant (300 mL) obtained was then fractionated with iced ethanol by adapted methodology of Cortez and Pessoa (1999). The ethanol concentration values employed in the precipitation experiments were 0–30% (Fraction F1) and 30–70% (Fraction F2). For each fraction, the ethanol was slowly added to the extract under agitation (200 rpm) at 4 °C with a burette in a cold chamber. After the addition of ethanol, the agitation was stopped for 2 h and the mixture was centrifuged at 10,000g for 15 min at 4 °C. The pellets (Fraction F1 and F2) were dissolved in 75 mL 0.1 M Tris–HCl buffer (pH 8.0) at 25 °C and dialyzed against 4 L of 0.05 M Tris–HCl buffer (pH 8.0) for 2 h. |
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沒(méi)做過(guò) 百度到的 蛋白質(zhì)含量,離子強(qiáng)度,溶液pH值,乙醇濃度,溶液溫度。 1。蛋白質(zhì)含量,愈高,共沉多;反之,分離愈徹底。當(dāng)然有度。溶液太稀了,成本高。 2。離子強(qiáng)度:這與介電強(qiáng)度有關(guān)。 3。溶液pH值:調(diào)到目標(biāo)蛋白等電點(diǎn)周圍。 4。乙醇濃度:一般來(lái)說(shuō)乙醇濃度多少,與目標(biāo)蛋白的分子量有關(guān):比如8%,可沉淀纖維蛋白原,20%可沉淀球蛋白,40%可沉淀白蛋白等等,當(dāng)然,乙醇濃度與溶液pH值配合使用。加入乙醇不能過(guò)快,防止局部過(guò)濃。要邊加邊搖動(dòng)。 否則,共沉多!或者局部變性。 5。溶液溫度:必須低溫,乙醇反應(yīng)是個(gè)放熱反應(yīng),如果溫度高,可引起蛋白質(zhì)變性,不可逆的變形。 這五變參數(shù),要綜合,動(dòng)態(tài)的調(diào)整,可達(dá)到精確分離蛋白質(zhì)的作用。 |
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