Fig. 8. Black dots: plot of k _obs vs. [buffer] for the decay of DIDTC at 37 °C – in pH 7.4 MOPS buffer (10–100 mM) with ionic strength adjusted to 308 mM with NaCl. The slope of this line is 0.0123 ± 0.0005 M^–1 s^–1 and the intercept is (9.05 ± 0.09) × 10^–4 s^–1. Red hexagons: plot of k _obs vs. [buffer] for the decay of DIDTC^– at 37 °C in pH 7.4 phosphate buffer with ionic strength adjusted to 308 mM with NaCl. See text and ESI† for description of curve fitting equation.