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Historically, separation of a protein mixture after adsorption to a cation-exchange column is effected by alteration in ionic strength.An alternative separation method using pH induced gradient in the range of 4¨C7.5was studied.A cation-exchange column with large particle beads containing excessive carboxyls was employed.A pH-gradient across the columnwas generated by a step change at the column entrance using a non-retained buffer system. Consistency and accuracy of pH values in timed intervalswere demonstrated in three different batches. In development of the application, we found a correlation coefficient of >0.9 between the elution pH values of six acidic proteins and their isoelectric points.One case study showed the resolution between a monoclonal antibody and non-retained protein species from a protein A column. Another case study showed the feasibility of separating polyethylene glycol conjugated protein from native protein. ÆäÖкìÉ«²¿·ÖÎªÖØµã²»Ã÷°×µÄµØ·½¡£ ÀýÈçÌáµ½step change£¬¿É·ñ½âÊÍÒ»ÏÂÊÇÒ»ÖÖʲôÑù×ӵķ½·¨¡£ |
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thunderay
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3Â¥2009-04-11 13:07:47
pal2004
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thunderay(½ð±Ò+15,VIP+0):ллÐÖµÜ~ 4-11 13:08
thunderay(½ð±Ò+15,VIP+0):ллÐÖµÜ~ 4-11 13:08
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2Â¥2009-04-11 11:56:01
thunderay
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- ½ð±Ò: 14868.3
- ºì»¨: 1
- Ìû×Ó: 182
- ÔÚÏß: 129.8Сʱ
- ³æºÅ: 425995
- ×¢²á: 2007-07-28
- ÐÔ±ð: GG
- רҵ: ÉúÎïÖÆÒ©
4Â¥2009-04-11 16:20:32
jzz8035
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karl2100(½ð±Ò+1,VIP+0):лл»ØÌù£¡ 4-11 23:16
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thunderay(½ð±Ò+15,VIP+0):лл³æÓÑ£¬·ÒëµÄºÜºÃÁË£¬ºÇºÇ~ 4-12 09:57
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