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Physicochemical characteristics of OG + HA stored at kiln temperature for 90 days.
| Time (Days) | |||||||
|---|---|---|---|---|---|---|---|
| Kiln (40–45 °C) |
0 | 7 | 15 | 30 | 45 | 60 | 90 |
| pH | 6.9 + 0.03 | 6.5 + 0.04 | 6.2 + 0.02 | 5.7 + 0.05 | 5.5 + 0.001 | 6.9 + 0.01 | 5.8 + 0.06 |
| Concentration HA (µg/mL) | 11.22 + 0.001 | 8.31 + 0.001 | 7.89 + 0.012 | 7.76 + 0.003 | 5.81 + 0.01 | 6.62 + 0.02 | 5.82 + 0.001 |
| Concentration HA (%) | 100 | 83.93 | 79.69 | 78.38 | 58.68 | 66.86 | 58.78 |
