Preparation of affinity purified goat IgG to rabbit IgG
The affinity purified goat IgG to rabbit IgG was developed following
the procedure of Anandlaxmi and Prakash (2001). Briefly,
about 40 ml plasma from goats immunized against rabbit IgG containing
20 IU heparin/ml of blood was vortexed with rabbit IgG
agarose and loaded onto a small column. First, non-specific
proteins were eluted with PBS (0.5 M, 0.15 M NaCl, pH 7.2) buffer.
Proteins bound specifically were eluted with 15 ml of 0.1 M glycine–HCl
(pH 2.0). All steps were performed at room temperature.
The eluted fractions (3 ml each) were collected in vials containing
0.2 ml of 1 M Tris–HCl (pH 8.0). The eluted IgG was dialyzed
overnight against PBS and the protein content determined by
measuring the absorbance spectrophotometrically at 260 nm and
280 nm, and extrapolated from a normograph