Buffering capacity was measured at 25°C as described by Salaun et al. (2007) with some modifications. Acid titration was performed on 10 mL yogurt mix from initial pH to 4.00 by using 1N hydrochloric acid (Fisher Scientific) added in 0.05 mL increments at 30 sec intervals. Buffering capacities were calculated using the formula described by van Slyke (1922) and plotted against the corresponding pH values to generate buffering curves. The buffering curves of NS, PE and SA yogurt mixes from all replications were plotted, and the curves best representing the average of all replications for each yogurt mix were selected and used for interpretation. The following formula was used to calculate buffering capacity