UltraPure™ Glycine UltraPure™ Glycine is an amino acid used in the preparation of some electrophoresis buffers. With a pKa1 of 2.3 and a pKa2 of 9.6, UltraPure™ Glycine is suitable for buffering at the extremes of the common buffering range. Chemical Name: Glycine Form: Powder Product Size: 500 g Purity or Quality Grade: Molecular Biology Grade Shipping Condition: Approved for shipment at Room Temperature or on Wet Ice Regulatory Statement: For Research Use Only. Not for use in diagnostic procedures. Store at 15°C to 30°C.