1 U is the amount of heparin which hydrolyzes the same quantity of auramine O per minute under standard conditions like unit USP-reference standard of heparin sodium salt
质量标准：
外观Appearance 白色至类白色粉末 水溶解试验solubility in water clear ，200mg plus 5ml of water 干燥损失loss on drying ≤ 8.0% 锂lithium 3 to 4%（elemental analysis) 效价potency ≥ 150 usp units/mg 毛细管电泳Capillary electrophoresis (per usp) pass 核磁Proton NMR spectrum (per usp) pass
