Research Article
Optimization of Variables for Aqueous Extraction of Gum from Grewia mollis Powder
Table 4
Coefficients and analysis of variance of the effect of time, pH, temperature, and powder to water ratio on the yield of Grewia gum extract.
| | Source | Coefficient | Sum of square | Df | ratio | value |
| | Linear | 0.0601778 | | | | | | Constant | | | | | | | Time (h) | −0.452027 | 34.8446 | 1 | 0.10 | 0.7577 | | pH | 0.0502871 | 619.909 | 1 | 1.76 | 0.2048 | | Temperature (°C) | 0.00641689 | 37.7153 | 1 | 0.11 | 0.7482 | | Ratio | 0.0131883 | 5999.3 | 1 | 17.00 | 0.0009* | | Quadratique | | | | | | | Time time | 0.0993363 | 20.2103 | 1 | 0.06 | 0.8141 | | pH pH | −0.00276491 | 55.711 | 1 | 0.16 | 0.6967 | | Temperature temperature | 0.000007664 | 10.5134 | 1 | 0.03 | 0.8653 | | Ratio ratio | −0.000088 | 365.476 | 1 | 1.04 | 0.3249 | | Interaction | | | | | | | Time pH | 0.014648 | 185.664 | 1 | 0.53 | 0.4794 | | Time temperature | −0.000926884 | 339.648 | 1 | 0.96 | 0.3421 | | pH temperature | −0.000718786 | 101.004 | 1 | 0.24 | 0.6005 | | pH ratio | −0.000289118 | 173.185 | 1 | 0.49 | 0.4943 | | Time ratio | 0.000972389 | 75.5734 | 1 | 0.21 | 0.6501 | | Temperature ratio | 0.0000096834 | 9.5103 | 1 | 0.03 | 0.8718 |
| | Total error | 0.607627 | 5292.5 | 15 | | | | Total (corr.) | 1.80606 | 14902.5 | 29 | | |
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* the corresponding coefficients are significant.
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