Table 1.
pH measurements of sterile potato dextrose agar.
| Medium | Predicted pH of Buffer | Actual pHa | |
|---|---|---|---|
| Sterile Agar | |||
| Day 0 | Day 28 | ||
| Unbuffered PDA | n/a | 5.63 | 5.47 |
| Tris buffered PDA | 7.20 | 6.61 | 6.50 |
| 8.00 | 7.61 | 7.59 | |
| 9.00 | 8.24 | 8.19 | |
| Citrate-phosphate buffered PDA | 3.00 | 3.51 | 3.69 |
| 4.00 | 4.28 | 4.49 | |
| 5.00 | 5.17 | 5.40 | |
| 6.00 | 6.07 | 6.31 | |
| 7.00 | 7.01 | 7.23 | |
| Carbonate-bicarbonate buffered PDA | 9.20 | 9.07 | 9.13 |
| 10.00 | 9.25 | 9.26 | |
| 10.70 | 9.35 | 9.39 | |
| Tris-maleate buffered PDA | 5.20 | 5.21 | 5.02 |
| 6.00 | 5.84 | 5.75 | |
| 7.00 | 6.53 | 6.45 | |
| 8.00 | 7.37 | 7.30 | |
| 8.60 | 7.91 | 7.83 | |
a Average of three samples is shown.