The decrease in folate was faster for spinach than for green
beans at the beginning of the time course. The plateau was also
reached faster for spinach than for green beans with a higher level
for green beans than for spinach. Indeed, the residual ratio in spinach
(Table 1), expressed by the C1/C0 ratio at the plateau, was (on
average) 26% of the initial concentration at pH 7 and in the same
order of magnitude at pH 5. At pH 7, temperature had no effect
on residual ratio while at pH 5 temperature had an effect especially
at 65 C. For green beans, the residual ratios (C1/C0) were on average
62% of the initial concentration at pH 7 and 72% of the initial
concentration at pH 5 (Table 1). Temperature seemed to have an
effect on the residual ratio both at pH 7 (from 0.7 at 25 C to
0.41 at 65 C) and at pH 5 (from 1.17 at 25 C to 0.43 at 65 C).