Molecular weight: 327.2 D (CP: 211.1 D)
Appearance: White crystals
Solubility: Clear, colorless solution in water (c=150 mg/ml), free from fuzz
pH value (c=10 mg/ml in water): 7.7-8.7
Creatine-P-Na₂ x 4 H₂O (based on value found enzymatically): ≥97%
Creatine-P (enzymatically): ≥63%
Creatine-P (from P_organic): ≥63%
Na (flame photometric): 14±1%
Water (K. Fischer): 22±2%
P_organic (P_total- P_i): ≥9.25%
P_total: ≥9.25%
P_i (acid labile): ≤0.5%
P_i (Fiske and Subbarow): ≤1.5%
PP_i (enzymatically): ≤0.02%
ATP (enzymatically with hexokinase/G6P-DH): ≤0.002%
Sulfate (qualitative): Negative
Creatine, free: ≤0.5%
Glucose-6-P (enzymatically): ≤0.006%
PEP (enzymatically): ≤0.05%
Pyruvate (enzymatically): ≤0.02%
Kinetic of creatine kinase reaction: Corresponds to standard
Reaction rates (creatine kinase): 95-105%
A₃₃₄ (c=9 ml/ml water): ≤0.005
A₃₃₄ (against reaction mixture CK NAC active): ≤0.040
A₃₄₀ (hydrous solution): ≤0.120
Stability: At +2 to +8°C within specification range for 36 months. Store dry.