Research Article
Optimization of Aqueous Two-Phase Systems for the Recovery of Soluble Proteins from Tannery Wastewater Using Response Surface Methodology
Table 6
Estimated regression coefficients for recovery (%) without outlier.
| Term | Coefficient | Standard Error of coefficient | | |
| Constant | 89.8078 | 0.5011 | 179.231 | 0.000* | pH | 1.9683 | 0.3324 | 5.922 | 0.000* | NaCl | | 0.3324 | −9.091 | 0.000* | Temperature | | 0.4108 | | 0.097 | pHpH | | 0.3317 | −4.416 | 0.002* | NaClNaCl | | 0.3317 | −3.030 | 0.014* | TemperatureTemperature | | 0.4236 | | 0.000* | pHNaCl | | 0.4343 | −1.310 | 0.223 | pHTemperature | | 0.4343 | −3.612 | 0.006* | NaClTemperature | | 0.4343 | −6.318 | 0.000* |
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= 97.27%; (adj) = 94.54%.
*Significant at 95% confidence level.
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