Anion exchange chromatography 1. In the purification, the pH of the PBS buffer was 6.5, and the...

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Biology

Anion exchange chromatography

1. In the purification, the pH of the PBS buffer was6.5, and the two proteins have different isoelectric points(Haemoglobin pI: pI 6.8; Catalase: pI 5.4). What are the chargestates of the two proteins at this pH? (e.g. positively charged,negatively charged or neutral)

2. Based on the charge states of the proteins, whichprotein has a higher affinity to the DEAE-Sepharose resin at pH6.5?

3. Why was the salt concentration of PBS bufferincreased (from 17.5 mM to 175 mM) in order to elute out thecatalase protein?

Answer & Explanation Solved by verified expert
4.4 Ratings (697 Votes)
1Haemoglobin is positively charge at ph 65 Catalase is negatively charged at ph 65 Reason pi is that pH at which there is not net charge on the molecule If the ph of the solution is less than the    See Answer
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