Non-ideal behaviour of free vanadate on a Superose 12 size-exclusion column. Application to in vivo 48V-labelled rat spleen homogenate.
Seven chromatographic columns were evaluated for the recovery of 48V-radiolabelled vanadate. Further, the behaviour of vanadate (H2VO4-) was studied on a size-exclusion column Superose 12 as a function of (a) buffer salt molarity, (b) different buffer salts, (c) different buffers and (d) organic solvents added to the buffer. As opposed to the unsatisfactory recovery of V-compounds on other columns, we recovered the vanadium quantitatively. We observed that in most cases vanadate eluted after the total volume of the Superose 12 column. This indicates a non-ideal behaviour of vanadate. However, through this non-ideal behaviour it was possible to separate low-molecular-mass bound (Mr<5000) and unbound vanadium which would not be possible under normal behaviour. A possible explanation for this non-ideal behaviour of vanadium is put forward. The method has been successfully applied for the fractionation of different vanadium species in rat spleen homogenate.
De Cremer
K
K
Institute of Nuclear Sciences, Ghent University, Belgium. koen.decremer@rug.ac.be
Cornelis
R
R
Strijckmans
K
K
Dams
R
R
Lameire
N
N
Vanholder
R
R
D000818:Animals; D002021:Buffers; D002850:Chromatography, Gel / Q000379:methods*; D008970:Molecular Weight; D051381:Rats; D012492:Salts; D012997:Solvents; D013154:Spleen / Q000737:chemistry*; D014638:Vanadates / Q000737:chemistry*
D002021:Buffers; D012492:Salts; D012997:Solvents; D014638:Vanadates