Purified IgG is mixed, concentrated sodium phosphate buffer, 0.1 mg/ml in.(0.001 M, pH7.0) pH of the solution is adjusted to colloidal gold and break out with IgG 0.1 M Na2CO3 pH8.0.Aliquots of variable concentrations (0.01-0.1 mg/ml) of IgG in 0.2 ml issue prepared sodium phosphate buffer, then add 1 ml solution colloidal gold separately as described previously (Li et al., 2013)After incubating the mixture for 10 minutes to 0.1 ml of 10% NaCl was added to the tubes and the absorbance at-At 520 nm from the protein needed to maintain the abscissa stable colloidal gold is less.In a curve that is drawn from the concentration.
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