Following assumptions were made in the model whereby
the reaction mechanism, proposed by [29], was taken into
account: (i) a high affinity binding between ascorbic acid and
ascorbate oxidase (k2 = 0 s), (ii) the diffusion of O2 from the air
into the liquid is minimal (k5 = 0 s), and (iii) no spontaneous
oxidation of ascorbic acid appears (k6 = 0 s).