Diffusion of acids (citric and malic acids) from green beans
showed diffusivity constants in the same order for both acids at
all temperatures and pH, on average about 4.6 1010 m2/s (Table
1). However, plateau levels were very different. Citric acid
was almost completely extracted while malic acid was still present
in green beans. The temperature and pH did not seem to have any
effect on the rate of diffusion for the two acids studied. However,
the diffusivity constant of citric acid was higher than that of malic
acid and the diffusion was faster for citric acid than for malic acid