PR1MA™  HEPES, Free Acid [N-(2-Hydroxyethyl) piperazine N'-(2-ethanesulfonic acid)]

Common Name: [N-(2-Hydroxyethyl) piperazine N'-(2-ethanesulfonic acid)]
CAS Number: 7365-45-9
Molecular Weight: 238.3
Chemical Formula: C₈H₁₈N₂O₄S
Solubility: Water
Storage Temperature: Room Temperature

Zwitterionic N-substituted aminosulfonic acid buffer.

• pka (25°C): 7.5
• pH Range (Working): 6.8 - 8.2
• Heavy Metals: <0.001% Max

• Appearance: White Crystalline Powder
• Assay (Titration, dried basis): ≥ 99.5 %
• DNase, RNase, protease: Not Detected
• Endotoxin (0.2% Solution): ≤ 0.25 EU/ml
• Heavy Metals (as Pb): ≤ 0.001 %
• Identification (IR): Pass
• Iron (Fe): ≤ 0.0005 %
• Loss on Drying: ≤ 1.0 %
• pH (5% in water): 5.0 - 6.5
• pKa @ 20°C: 7.35 - 7.70
• Residue on Ignition: ≤ 0.1 %
• Solubility (1M Solution in Water ) : Clear and Colorless Solution
• Sulfate: ≤ 0.05 %
• UV Absorbance (1M@260nm): ≤ 0.05
• UV Absorbance (1M@280nm): ≤ 0.05