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chunqizzm: »ØÌûÖö¥ 2012-03-26 21:40:44
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ÕâÊÇÎÒÒ»Ö±ÓõÄTCA·½·¨ 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 ¨C20C and then 15min 4C; or longer time at 4C without the ¨C20C 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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Õâ¸öÊÇ×î³£ÓõÄTCA³Áµí·½·¨£¬Ò»°ãÐèÒªµ°°×ÔÚ5¦Ìg/mlÒÔÉϲÅÄܳÁÏÂÀ´£¬Ò²¾ÍÊÇ˵´ó¸Å»¹ÓÐ5¦Ìg/ml×óÓÒµ°°×²»ÄܳÁµíÀ´£¬ÕâÊÇÀíÂ۵ģ¬Êµ¼ÊÊÕÂÊÓëÑùÆ·ºÍ²Ù×÷Ïà¹Ø£¬Èç¹ûÄãÑùÆ·±ÈÕâŨ¶È»¹µÍµÄ»°¿ÉÒÔÊÔÏÂTCA-DOC³Áµí£¬ÄܳÁµí1¦Ìg/mlÒÔϵĵ°°×£¬È»ºóÒøÈ¾¡£ 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 ¨C20C). 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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9Â¥2012-03-26 22:04:27
2Â¥2012-03-25 23:17:06
chunqizzm
Òø³æ (СÓÐÃûÆø)
- BioEPI: 1
- Ó¦Öú: 5 (Ó×¶ùÔ°)
- ½ð±Ò: 1101.6
- Ìû×Ó: 123
- ÔÚÏß: 78.7Сʱ
- ³æºÅ: 1264287
3Â¥2012-03-25 23:43:09
4Â¥2012-03-26 09:13:32
xingnian0925
½ð³æ (СÓÐÃûÆø)
- BioEPI: 1
- Ó¦Öú: 2 (Ó×¶ùÔ°)
- ½ð±Ò: 1300.2
- Ìû×Ó: 113
- ÔÚÏß: 54.1Сʱ
- ³æºÅ: 1181180
5Â¥2012-03-26 09:16:16
chunqizzm
Òø³æ (СÓÐÃûÆø)
- BioEPI: 1
- Ó¦Öú: 5 (Ó×¶ùÔ°)
- ½ð±Ò: 1101.6
- Ìû×Ó: 123
- ÔÚÏß: 78.7Сʱ
- ³æºÅ: 1264287
7Â¥2012-03-26 21:42:52
chunqizzm
Òø³æ (СÓÐÃûÆø)
- BioEPI: 1
- Ó¦Öú: 5 (Ó×¶ùÔ°)
- ½ð±Ò: 1101.6
- Ìû×Ó: 123
- ÔÚÏß: 78.7Сʱ
- ³æºÅ: 1264287
8Â¥2012-03-26 21:46:56
chunqizzm
Òø³æ (СÓÐÃûÆø)
- BioEPI: 1
- Ó¦Öú: 5 (Ó×¶ùÔ°)
- ½ð±Ò: 1101.6
- Ìû×Ó: 123
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wen1023tao
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11Â¥2012-03-27 11:36:06
12Â¥2012-03-27 16:14:18
13Â¥2013-03-29 15:10:30














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