Table 2 shows the effect of extraction time and pulp:water ratios
on the yield of soluble solids from date fruits using traditional
extraction (100 C without enzyme). The yield of soluble from
Deglet Nour was higher than that from Allig and Kentichi. Indeed,
the yield reached 68 g of Total Soluble Solids (TSS)/100 g fresh
weight for Deglet Nour, 65 of TSS/100 g fresh weight for Kentichi
and 63.3 of TSS/100 g fresh weight for Allig. This difference is probably due to the difference of the initial quantity of soluble
solids of the three varieties. In fact, Deglet Nour fruit present the
highest amount of total soluble solids (75.4 Brix) followed by
Kentichi (69.74Brix) and Allig (65.05Brix) (Table 1).
The best yields of soluble solids were obtained for of pulp:water
ratios 1:3 and 1:4 whatever the time. For economic reasons it is
interesting to choose the pulp:water ratio 1:3 since it gave the same
yield that 1:4 pulp:water ratio (P > 0.05). This permits a gain of
time and energy during concentration. For more than 15 min, no
significant differences (P > 0.05) existed between yields of soluble
solids of the three varieties.