ChromPure is our trade name for highly purified proteins from the serum of non-immunized animals.Physical State: Sterile-filtered liquid Storage: Store at 2-8°C under sterile conditions. Prepare working dilution fresh each day.Expiration date: one year from date of receipt. However, the expiration date may be extended if the product is stored according to the recommendation and the test results are acceptable for its intended use.Purity:Based on immunoelectrophoresis at an antigen concentration of 20 mg/ml, the pattern of precipitation against goat anti-human whole serum is the same as that against goat anti-human IgM, Fc5m fragment specific.No precipitin line was detected against goat anti-human IgG, Fc fragment specific; goat anti-human IgA, a chain specific; or goat anti-humanalpha-2 macroglobulin. Buffer: 0.01M Sodium Phosphate, 0.25M NaCl, pH 7.6 Preservative:None