Determination of CAT activity was performed by the method of Hong et al. (2012). The reaction mixture consisted of 2.8 mL H2O2 (40 mM, in 50 mM sodium phosphate buffer, pH 7.0) and 0.2 mL
enzyme extract. The decomposition of H2O2 was measured by the decline in absorbance at 240 nm during 120 s. The specific activity was expressed as U g−1, where one unit of catalase converts l mol of H2O2 per mass of fresh fruit flesh per min at 30 ◦C