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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 ] |
蛋白質實驗技術 |
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這是我一直用的TCA方法 Normal TCA To eliminate TCA soluble interferences and protein concentration 1) To a sample of protein solution add Trichloroacetic acid (TCA) 100% to get 13% final concentration. Mix and keep 5min –20C and then 15min 4C; or longer time at 4C without the –20C step for lower protein concentration. Suggestion: leave ON if the protein concentration is very low. 1) (preparation of 100% TCA: 454ml H2O/kg TCA. Maintain in dark bottle at 4C.Be careful, use gloves!!!). 2) 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). 3) For PAGE-SDS, resuspend samples in a minimal volume of sample buffer. (The presence of some TCA can give a yellow color 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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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,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.) |
送鮮花一朵 |
很有幫助。∧懿荒馨l(fā)一下這種方法的出處?(文獻或資料)chunqizzm@126.com 還有就是,TCA-DOC方法中DOC(脫氧膽酸鈉)起什么作用知道嗎??第4步中OPTION的要用到丙酮是不是必須要這一步? 本來是想再送JB的可是一個人只能送10個! |
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