Table 3.
Total phenolic content in collected ripe date fruit samples from pooled data for all available data and data stratified based on extraction solvents, production countries, and ripe date fruit cultivars.
| Pooled data | Number of values | Number of studies | Total Phenolic Content mean ± SD (median ± range (min.-max.)) * mg GAE/100 g DW |
|---|---|---|---|
| All pooled data | 151 | 22 | 246.68 ± 216.51 (229.92 ± 953.66 (0.93–954.59)) |
| Extraction solvents** | |||
| Methanol 80% | 68 | 11 | 224.02 ± 237.29 (105.6 ± 781.87 (0.93–782.8)) |
| Methanol 50% | 14 | 3 | 306.8 ± 94.3 (283.99 ± 360.22 (199.44–559.66)) |
| Acetone 70% | 22 | 3 | 187.06 ± 189.8 (119.44 ± 772.34 (11.13–783.47)) |
| Production countries** | |||
| Algeria | 34 | 5 | 153.04 ± 275.82 (14.12 ± 952.53 (2.06–954.59)) |
| Iran | 30 | 4 | 223.2 ± 243.68 (105.32 ± 781.87 (0.93–782.8)) |
| Saudi Arabia | 10 | 3 | 423.75 ± 94.92 (449.29 ± 282.68 (264.58–547.26)) |
| Tunisia | 37 | 7 | 202.14 ± 107.76 (168.28 ± 523.46 (36.2–559.66)) |
| Ripe date fruit cultivars** | |||
| Deglet Nour | 11 | 11 | 205.55 ± 163.91 (225.57 ± 543.37 (4.72–548.09)) |
| Zahedi | 6 | 6 | 189.02 ± 190.16 (143.96 ± 3.88–445.69) |
| Khalas | 5 | 4 | 323.07 ± 82.87 (328.98 ± 214.77 (231.0–445.77)) |
| Medjool | 3 | 3 | 363.72 ± 44.54 (379.49 ± 84.79 (313.44–398.23)) |
| Kabkab | 3 | 3 | 134.99 ± 230.05 (3.25, 399.54 (1.09–400.63)) |
| Allig | 3 | 3 | 320.91 ± 212.97 (252.58 ± 409.16 (150.5–559.66)) |
| Piarom | 3 | 3 | 136.28 ± 227.81 (6.09 ± 395.92 (3.41–399.33)) |
| Kentichi | 3 | 3 | 217.72 ± 62.74 (245.51 ± 115.9 (145.88–261.78)) |
*
Min.: minimum value; Max. maximum value, GAE: Gallic acid equivalents, DW: Dry weight.
**
Total phenolic content was reported for pooled data stratified based on used extraction solvent, production country, and type of cultivar only when data were reported in at least three selected studies.