The affinity purified immunoglobulin (IgG) was conju-
ated to colloidal gold (40nm) according to the methods,
s described previously (Horisberger, 1989). The optimal
oncentration of antibody for conjugation with colloidal
old was determined by titrating aliquots of diluted IgG
with colloidal gold. The purified IgG was diluted to a con-
entration of 0.1mg/ml in sodium phosphate buffer
0.001M, pH7.0). The pH of colloidal gold solution and
he diluted IgG was adjusted to pH8.0 with 0.1M Na2CO3.
Ten aliquots of variable concentrations (0.01 - 0.1mg/ml)
f the diluted IgG were prepared in 0.2 ml sodium phos-
hate buffer, and added separately to 1 ml of the colloidal-
old solution, as described previously (Li et al., 2013).
After incubating the mixture for 10 min, 0.1 ml of 10%
NaCl was added to the tubes and the absorbance was mea-
ured at 520 nm. The least amount of protein required to
tabilize the colloidal gold was identified from the abscissa
The affinity purified immunoglobulin (IgG) was conju-ated to colloidal gold (40nm) according to the methods,s described previously (Horisberger, 1989). The optimaloncentration of antibody for conjugation with colloidalold was determined by titrating aliquots of diluted IgGwith colloidal gold. The purified IgG was diluted to a con-entration of 0.1mg/ml in sodium phosphate buffer0.001M, pH7.0). The pH of colloidal gold solution andhe diluted IgG was adjusted to pH8.0 with 0.1M Na2CO3.Ten aliquots of variable concentrations (0.01 - 0.1mg/ml)f the diluted IgG were prepared in 0.2 ml sodium phos-hate buffer, and added separately to 1 ml of the colloidal-old solution, as described previously (Li et al., 2013).After incubating the mixture for 10 min, 0.1 ml of 10%NaCl was added to the tubes and the absorbance was mea-ured at 520 nm. The least amount of protein required totabilize the colloidal gold was identified from the abscissa
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