Table 2.
Firmness, Soluble solid content, titratable acidity, and pH of blueberry fruits at different maturity stages.
| Cultivars | Maturity Stages | Firmness (N/5 mmØ) |
Soluble Solid Concentration (°Brix) |
Titratable Acidity (%) |
SSC/TA Ratio | pH |
|---|---|---|---|---|---|---|
| Nelson | Unripe Ripe |
6.71 ± 0.69 bc 4.25 ± 0.79 f |
10.23 ± 0.06 c 12.67 ± 0.15 a |
2.20 ± 0.03 b 0.77 ± 0.02 f |
4.65 16.45 |
2.66 ± 0.01 f 3.12 ± 0.02 c |
| Toro | Unripe Ripe |
6.87 ± 0.57 ab 5.38 ± 0.54 d |
8.53 ± 0.15 f 10.30 ± 0.10 c |
2.08 ± 0.02 c 0.64 ± 0.01g |
4.10 16.09 |
2.62± 0.01 fg 3.07 ± 0.04 d |
| Duke | Unripe Ripe |
7.15 ± 0.42 a 5.09 ± 0.58 de |
7.93 ± 0.25 g 10.27 ± 0.15 c |
1.90 ± 0.03 d 0.46 ± 0.01 h |
4.17 22.33 |
2.60 ± 0.01 g 3.31 ± 0.02 a |
| Bluejay | Unripe Ripe |
6.78 ± 0.51 bc 4.78 ± 0.69 e |
9.57 ± 0.06 e 12.87 ± 0.15 a |
2.39 ± 0.03 a 0.66 ± 0.01 g |
4.00 19.50 |
2.64 ± 0.02 fg 3.26 ± 0.05 b |
| Elliot | Unripe Ripe |
6.51 ± 0.82 c 4.91 ± 0.61 e |
9.87 ± 0.06 d 11.53 ± 0.06 b |
2.10 ± 0.01 c 1.07 ± 0.02 e |
4.70 10.78 |
2.66 ± 0.01 f 2.85 ± 0.04 e |
Date are means ± standard deviation. a–g Values in the same column not sharing a common superscript are significantly different by Duncan’s multiple range test (p < 0.05). SSC/TA ratio is calculated by SSC (°Brix)/titratable acidity (%).