2.6 Statistical analysis
All data presented in this study are the mean ±SD. Mean final pH values were calculated geometrically. One-way ANOVA was used to test for significant variation, after homogeneity and normality were satisfied. Duncan’s and Tukey’s post-hoc tests were used to test for significance among treatments while percentage data were compared using a non-parametric Mann–Whitney test. The threshold of statistical significance was set at P<0.05. The data were analyzed using SPSS 16.0 (SPSS Inc., Chicago, IL, USA).