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Mean values ± standard deviation of colorimetric parameters (a*, b*, L*). CTR: control samples: BHT: samples added with the synthetic antioxidant; EX0.5: samples added with olive leaf extract at 0.5 g kg−1; EX1: samples added with olive leaf extract at 1 g kg−1. One-way ANOVA and Tukey’s test were performed among the samples for each time. Different letters indicate significant differences for p < 0.05.
