For Research Use Only. Not for Use in Diagnostic Procedures. Buffer containing Tris (Tris (hydroxymethyl) aminomethane) (0.05M), Sodium Chloride (0.175M), EDTA (7.5mM), BSA (0.2%), and 0.9 g/L Sodium Azide (as preservative). Can be used as buffer recommended by the USP for the assay of heparin anti-IIa activity in combination with BIOPHEN ANTI-IIa (2 Stages Heparin Assay) kit. USP = United States Pharmacopeia. Please see important notification letter from the manufacturer regarding the use of this product. 4 x 25mL. Buffer containing Tris (hydroxymethyl) aminomethane, sodium chloride, EDTA, BSA, and Sodium Azide. Order online here or call 1-866-783-3797.