Non-ideal behaviour of free vanadate on a Superose 12 size-exclusion column. Applicationto in vivo ~(48)V-labelled rat spleen homogenate

摘要

Seven chromatographic columns were evaluated for the recovery of ~(48)V-radiolabelled vanadate. Further, the behaviour of vanadate (H_2VO_4~-) was studied on a size-exclustion 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-molecular-mass bonund (M_r<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 diferent vanadiumspecies in rat spleen homogenate.