Fig. 6

Results of the kinetic model describing the spectrophotometric data of the enzymatic assay to measure pyruvate decarboxylase activity. Results are shown for 3 representative biological apple fruit extracts. Fitted (line) and measured (dots) values are shown. The estimated \( {\text{k}}_{\text{PDC}}^{\prime } \) values were respectively 276 ± 9.5 mol L⁻¹ s⁻¹ kg⁻¹ (triangle), 386 ± 5.6 mol L⁻¹ s⁻¹ kg⁻¹ (square) and 576 ± 16.9 mol L⁻¹ s⁻¹ kg⁻¹ (circle) all expressed on a total protein weight base