Table 2. Molar concentrations of abundant osmolytes in sweet and sour cherry, grape and pluma at maturity.
| Constituent | Molar concentration (mM) | ||||
|---|---|---|---|---|---|
| Sweet cherry | Sour cherry | Grape | Plum | ||
| Organic acids | Malic acid | 70.1 (6.7)b |
161.1 (18.5) |
33.7 (3.6) |
91.0 (14.6) |
| Citric acid | 0.9 (0.1) |
1.6 (0.2) |
1.9 (0.2) |
1.8 (0.3) |
|
| Tartaric acid | 27.6 (3.0) |
||||
| Sugars | Glucose | 431.8 (41.1) |
287.5 (33.1) |
388.3 (41.9) |
131.0 (21.0) |
| Fructose | 393.5 (37.5) |
237.6 (27.3) |
398.9 (43.0) |
52.2 (8.4) |
|
| Sorbitol | 76.9 (7.3) |
86.7 (10.0) |
0.3 (0.0) |
59.8 (9.6) |
|
| Sucrose | 4.4 (0.4) |
12.3 (1.4) |
12.1 (1.3) |
215.0 (34.5) |
|
| Minerals | Potassium | 56.3 (5.4) |
65.2 (7.5) |
51.2 (5.5) |
58.8 (9.4) |
| Calcium | 4.2 (0.4) |
4.0 (0.5) |
3.2 (0.3) |
3.2 (0.5) |
|
| Magnesium | 4.5 (0.4) |
5.8 (0.7) |
3.7 (0.4) |
3.3 (0.5) |
|
| Phosphate | 6.5 (0.6) |
7.1 (0.8) |
5.8 (0.6) |
6.5 (1.0) |
|
| Sum | 1050 (100) |
870 (100) |
927 (100) |
623 (100) |
|
a Molar concentrations are taken from [29].
b The values in brackets represent the relative contributions (percentage) of the individual osmolytes to total osmolarity. The osmolarity was calculated assuming ideal behavior of the osmolytes and a 1:1 relationship between molarity and osmolarity.