Supercoiled circular DNA and protein retention in non-equilibrium chromatography temperature and velocity dependence: testimony of a transition.
Non-equilibrium chromatography (NEC) is a chromatographic mode for the rapid separation of polymers. The retention behavior of various proteins (human, chicken, bovine serum albumin) and supercoiled circular double-stranded DNA (plasmids) was investigated using a phosphate buffer as a mobile phase at different velocities and column temperatures with a C1 column with very low-packing particle diameter as a stationary phase. It was shown that the two factors (temperature and velocity) constituted important parameters in the retention mechanism of plasmids and proteins in NEC. The protein was retained more than the plasmid. At all the temperatures (5, 10, 15, 20, 25 degrees C) the plasmid retention increased over the entire flow-rate range (0.02-1.8 ml/min). For the protein, the retention curve presented a decrease in the relative retention time until a critical value of the mobile phase flow-rate, followed by an increase. The transition between the two well known NEC methods, slalom chromatography and hydrodynamic chromatography was clearly visualized for proteins at the lowest temperature, but did not appear for plasmids due to their strong compact structure.
Perrin
François Xavier
FX
Laboratoire de Chemie Appliquée, La Valette du Var, France.
Masuyer
Carol Courderot
CC
Truong
Tong-Thanh
TT
Guinchard
Christiane
C
Millet
Joëlle
J
Chaumont
Jean Pierre
JP
Thomassin
Mireille
M
Guillaum
Yves Claude
YC
Nicod
Laurence
L
D002845:Chromatography / Q000379:methods*; D004278:DNA, Superhelical / Q000737:chemistry*; D011506:Proteins / Q000737:chemistry*; D013696:Temperature
D004278:DNA, Superhelical; D011506:Proteins