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SDS-PAGE樣品濃縮的方法
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SDS-PAGE樣品需要濃縮大家用的是什么試劑(例如:TCA)?具體步驟?![]() [ Last edited by chunqizzm on 2012-3-25 at 23:36 ] |
蛋白質(zhì)實驗技術(shù) |
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這個是最常用的TCA沉淀方法,一般需要蛋白在5μg/ml以上才能沉下來,也就是說大概還有5μg/ml左右蛋白不能沉淀來,這是理論的,實際收率與樣品和操作相關(guān),如果你樣品比這濃度還低的話可以試下TCA-DOC沉淀,能沉淀1μg/ml以下的蛋白,然后銀染。 TCA-DOC For precipitation of very low protein concentration 1) To one volume of protein solution, add 1/100 vol. of 2% DOC (Na deoxycholate, detergent). 2) Vortex and let sit for 30min at 4C. 3) Add 1/10 of Trichloroacetic acid (TCA) 100% vortex and let sit ON at 4C (preparation of 100% TCA: 454ml H2O/kg TCA. Maintain in dark bottle at 4C.Be careful, use gloves!!!). 4) Spin 15min 4C in microfuge at maximum speed (15000g). Carefully discharge supernatant and retain the pellet: dry tube by inversion on tissue paper (pellet may be difficult to see). [OPTION: Wash pellet twice with one volume of cold acetone (acetone keep at –20C). Vortex and re-pellet samples 5min at full speed between washes]. 5) Dry samples under vacuum (speed vac) or dry air. For PAGE-SDS, resuspend samples in a minimal volume of sample buffer. (The presence of some TCA can give a yellow colour as a consequence of the acidification of the sample buffer; titrate with 1N NaOH or 1M TrisHCl pH8.5 to obtain the normal blue sample buffer color.) |
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