Table 6. Changes in yield, acid value, and optical density (OD) affected by different treatment quantities of 20% sodium hydroxide solution
| 20% NaOHtreatment (%) | Yields (%) | Acid value(mg KOH/g) | OD(480 nm) |
| Degummed oil | 100±0.00a1) | 17.29±0.02a | 2.78 |
| 3 | 78.86±0.52b | 4.65±0.02b | 1.39 |
| 4 | 77.33±0.67c | 1.60±0.01c | 1.16 |
| 5 | 75.38±0.12d | 0.27±0.02d | 1.06 |
| 6 | 72.11±0.41e | 0.17±0.03e | 0.99 |
| 7 | 70.41±0.33f | 0.15±0.01e | 0.97 |
Values are mean±SD (n=3). Means with the different letters in the same column are significantly different (p<0.05).