| Sample | 3 days | 13 days | 23 days | 33 days |
| Batch 1 | 4.46 +/− 0.11 | 4.13 +/− 0.06 | 4.13 +/− 0.06 | 3.96 +/− 0.06 |
| Batch 2 | 4.46 +/− 0.05 | 4.26 +/− 0.06 | 4.16 +/− 0.06 | 3.96 +/− 0.06 |
| Batch 3 | 4.46 +/− 0.15 | 4.26 +/− 0.15 | 4.16 +/− 0.15 | 3.93 +/− 0.11 |