A method in {HEAD ~ accordance} 1, wherein the ion exchange column is {TAIL ~ a cation exchange column} 
A method in { HEAD ~ accordance } 1 , wherein the ion exchange column is { TAIL ~ a cation exchange column }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL