Research Article
Optimization of Aqueous Two-Phase Systems for the Recovery of Soluble Proteins from Tannery Wastewater Using Response Surface Methodology
Table 4
Estimated regression coefficients for percentage recovery.
| Term | Coefficient | Standard error of coefficient | | |
| Constant | 89.8802 | 1.1292 | 79.597 | 0.000 | pH | 1.9683 | 0.7492 | 2.627 | 0.025* | NaCl | | 0.7492 | | 0.002* | Temperature | | 0.7492 | | 0.312 | pHpH | | 0.7492 | | 0.024* | NaClNaCl | | 0.7492 | | 0.070 | TemperatureTemperature | | 0.7492 | | 0.004* | pHNaCl | | 0.7492 | | 0.574 | pHTemperature | | 0.7492 | | 0.140 | NaClTemperature | | 0.7492 | | 0.019* |
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= 84.86%; (adj) = 71.22%.
*Significant at 95% confidence level.
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