Machine-translated by Google. Questions are authored in English.
Top

Discussion

What does ion exchange chromatography separate by?

  • A.Molecular size, through pores of controlled diameter
  • B.Polarity, through a non-polar bonded surface
  • C.Volatility, through partition into a liquid film
  • D.Charge, through binding to a charged stationary phase

Answer: D

A resin carrying fixed charges retains counter-ions of the opposite sign, and they are displaced by raising the salt concentration or changing the pH. Size, polarity and volatility are the bases of the other modes. Because charge depends on pH, both the retention and the elution can be controlled through it, which makes the mode particularly suited to proteins and inorganic ions.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.