3.2.2. Degradation of l-ascorbic acid during the drying
process
Variation of l-ascorbic acid content during pineapple drying
at 45, 60 and 75◦
C is shown in Fig. 5. The vitamin C retention
is expressed as C/C0, where C=mg of l-ascorbic acid per g of
dry solid (mg/g of dry matter) and C0
=mg of l-ascorbic acid
per g of dry solid prior to drying (mg/g of dry matter).
The maximum vitamin C retention was observed during
drying at 45◦
C. Difference in C0
values did not affect the
deterioration kinetics, since the global behavior was similar