Both the modification and conjugation buffers are provided at a 10X concentration. Each is provided as 5 x 1.5 mL vials. So 7.5 mL x 10 = 75 mL of 1X buffer.

Modification Buffer
1.0 M Sodium Phosphate
1.5 M Sodium Chloride
pH 8.0

Conjugation Buffer
1.0 M Sodium Phosphate
1.5 M Sodium Chloride
0.05% Azide
pH 6.0