Table 2.

Kinetic constants for the oxidation of ABTS (λ = 660 nm; ε = 14,700 M⁻¹ cm⁻¹) [36] by H₂O₂ (2.5 mM) and hemin (2 μM) at 37 °C in the presence of varying amounts of Aβ₄₀ or Aβ₁₆ at pH 7.4 or 6.3. The calculated variability based on 2 independent measurements was equal to or less than 0.001 s⁻¹.

Species	pH 7.4−Aβ16 kobs (s−1)	pH 7.4−Aβ40 kobs (s−1)	pH 6.3−Aβ16 kobs (s−1)	pH 6.3−Aβ40 kobs (s−1)
Hemin	0.013	0.013	0.016	0.016
Aβ (1 equiv.)	0.022	0.018	0.034	0.027
Aβ (5 equiv.)	0.022	0.021	0.042	0.033
Aβ (20 equiv.)	0.032	0.027	0.053	0.038
Aβ (100 equiv.)	0.054	0.032	0.092	0.049