Research Article
Evaluation and Optimization of Downstream Process Parameters for Extraction of Betulinic Acid from the Bark of Ziziphus jujubae L.
Table 3
ANOVA for response surface quadratic model to verify whether developed model is significant or nonsignificant.
| Source | Sum of squares | Degree of freedom | Mean square | -value | value Prob. > | |
| Model | 0.21985 | 9 | 0.024 | 10.6998 | 0.0005 | Significant | -pH | 0.00052 | 1 | 0.0005 | 0.22679 | 0.6441 | | -time | 0.01245 | 1 | 0.012 | 5.45133 | 0.0417 | | -temp. | 0.14945 | 1 | 0.149 | 65.4605 | <0.0001 | | | 0.00045 | 1 | 0.0004 | 0.19711 | 0.6665 | | | 0.0045 | 1 | 0.0004 | 0.19711 | 0.6665 | | | 0.00125 | 1 | 0.0012 | 0.54752 | 0.4763 | | | 0.04388 | 1 | 0.044 | 19.2191 | 0.0014 | | | 0.01334 | 1 | 0.013 | 5.84505 | 0.0362 | | | 0.00035 | 1 | 0.0003 | 0.15316 | 0.7037 | | Residual | 0.02283 | 10 | 0.0022 | | | | Lack of fit | 0.00875 | 5 | 0.0017 | 0.62107 | 0.6930 | Nonsignificant |
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