Research Article
Optimization of Variables for Aqueous Extraction of Gum from Grewia mollis Powder
Table 3
Coefficients and analysis of variance of the effect of time, pH, temperature, and powder to water ratio on the viscosity of Grewia gum extract.
| | Source | Coefficient | Sum of square | Df | ratio | value |
| | Linear |
1.0657 | | | | | | Constant | | | | | | | Time (h) | −1.4624 | 0.0656 | 1 | 1.03 | 0.3266 | | pH | 0.394686 | 0.0180 | 1 | 0.28 | 0.6032 | | Temperature (°C) | 0.0353305 | 0.0261 | 1 | 0.41 | 0.5318 | | Ratio | 0.0391614 | 0.6450 | 1 | 10.11 | 0.0062* | | Quadratique | | | | | | | Time time | 0.324119 | 0.2773 | 1 | 4.35 | 0.0546 | | pH pH | −0.029087 | 0.2058 | 1 | 3.23 | 0.0926 | | Temperature temperature | −0.000305 | 0.2001 | 1 | 3.14 | 0.0968 | | Ratio ratio | 0.000326 | 0.4221 | 1 | 6.62 | 0.0212* | | Interaction | | | | | | | Time pH | 0.00995434 | 0.0079 | 1 | 0.12 | 0.7305 | | Time temperature | 0.00053787 | 0.0001 | 1 | 0.00 | 0.9698 | | pH temperature | −0.0000661 | 0.0003 | 1 | 0.00 | 0.9451 | | pH ratio | 0.00018535 | 0.0033 | 1 | 0.05 | 0.8222 | | Time ratio | −0.00008227 | 0.0030 | 1 | 0.05 | 0.8321 | | Temperature ratio | −0.00008382 | 0.0883 | 1 | 1.38 | 0.2578 |
| | Total error | 0.956746 | 0.9567 | 15 | | | | Total (corr.) | 4.57207 | 4.5721 | 29 | | |
|
|
* the corresponding coefficients are significant.
|
