NADH Grade II, disodium salt Roche

Absorbance coefficients: 14.3 x 10³ l x mol^-1 x cm^-1 at 260 nm, 6.18 x 10³ l x mol^-1 x cm^-1 at 334 nm (Hg), 6.3 x 10³ l x mol^-1 x cm^-1 at 340 nm, 3.4 x 10³ l x mol^-1 x cm^-1 at 365 nm (Hg)
Absorbance maximum: 260 nm and 340 nm
Formula: C₂₁H₂₇N₇O₁₄P₂Na₂
Molecular weight: NADH-Na₂: M_r = 709.4, NADH: M_r = 665.4
pH value in water: 7.5 ± 0.5 (100 mg/ml)
Stability:
  Solid: stable at +2 to +8°C, stored dry and protected from light
  Solution: 10 mg/ml in Na-bicarbonate buffer, pH 9, contains at least 95% NADH after 4 weeks at +2 to +8°C

Amorphous powder

Purity: 98% β-NADH-Na₂ based on dry weight (enzymatically and absorbance at 340 nm), 99% (absorbance at 260 nm),  A_260 nm-A_340 nm: <2.40
Organic solvents: <4% (GC)