Physicochemical Characteristics of Date Sap “Lagmi” from Deglet Nour Palm (Phoenix Dactylifera L.)

Figures & data

Table 1 Physicochemical characteristics of date palm sap of Deglet Nour cultivar

Parameter	Date palm sap
pH	6.86 ± 0,05
Density	1.087 ± 0,001
Colour parameters
L∗	72.01 ± 0,07
a∗	0.64 ± 0,02
b∗	15.64 ± 0,02
Dry matter (%)	21.31 ± 0.11
Total carbohydrate ^a	94.98 ± 0.43
Sucrose ^b	95.27
Glucose ^b	2.51
Fructose ^b	1.61
Myo-inositol ^b	0.36
Proteins ^a	2.72 ± 0.13
Fat ^a	< 0.02
Ash ^a	2.29 ± 0.09
Potassium ^c	522.92 ± 9.67
Magnesium ^c	330 ± 6.57
Phosphorus ^c	41.49 ± 3,11
Calcium ^c	14.67 ± 0.3
Sodium ^c	12.00 ± 0.6
Iron ^c	1.19 ± 0.26
Copper ^c	0.12 ± 0.03
Zinc ^c	0.23 ± 0.09
Total polyphenol	7.64 ± 0.2
Antioxidant activity%	47.64 ± 2.65
^aIn g/100 g of dry matter basis; ^bIn% of total sugars; ^cIn mg/100 g of dry matter basis.

Figure 1 Sugar HPLC elution profile from Deglet Nour palm sap (dilution 1: 100) obtained by HPAEC-PAD chromatography system.

Figure 2 (a). Rheological profile of lagmi (21.31 g/100 g sap) and date sap solutions prepared with lyophilized sap at 5, 10, and 30 g/100 g solution. (b). Viscosity (η) of native sap and lyophilized sap solutions as a function of concentration. Temperature = 20°C.

Figure 3 Dynamic surface tension at air-water interface of date palm sap of the Deglet Nour variety (•) at T = 20°C. Surface tension of MilliQ water ∼ 71,92 mN/m (----).

Figure 4 Equilibrium surface tensions (γ_e) at the air water interface as a function of dry matter concentration. Values are the mean of 4 determinations.

Figure 5 Effect of dry matter concentration in foam capacity (a) and stability (b) of native sap (21.31 g/100 g sap) and lyophilized sap solutions.