Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (2): 20220511.doi: 10.7503/cjcu20220511
• Physical Chemistry • Previous Articles Next Articles
GUO Wenjuan1,2(), ZHANG Ying1,2, YU Jie1, DAI Zhao1,2, HOU Weizhao1
Received:
2022-08-01
Online:
2023-02-10
Published:
2022-10-06
Contact:
GUO Wenjuan
E-mail:guowenjuan@tiangong.edu.cn
Supported by:
CLC Number:
TrendMD:
GUO Wenjuan, ZHANG Ying, YU Jie, DAI Zhao, HOU Weizhao. Law and Mechanism of Enrichment of Baicalin in Scutellaria baicalensis by Cu-NIC-TMED[J]. Chem. J. Chinese Universities, 2023, 44(2): 20220511.
Element | Coding | Standard(-1) | Standard(0) | Standard(1) |
---|---|---|---|---|
Adsorbent dosage/mg | A | 8.0 | 16.0 | 24.0 |
Crude extract concentration/(mg·mL-1) | B | 0.20 | 0.30 | 0.40 |
pH | C | 5.0 | 6.0 | 7.0 |
Table 1 Experimental values and coded levels of the element used for the central composite design
Element | Coding | Standard(-1) | Standard(0) | Standard(1) |
---|---|---|---|---|
Adsorbent dosage/mg | A | 8.0 | 16.0 | 24.0 |
Crude extract concentration/(mg·mL-1) | B | 0.20 | 0.30 | 0.40 |
pH | C | 5.0 | 6.0 | 7.0 |
Design point | Element A | Element B | Element C | Adsorption rate(%) | ||
---|---|---|---|---|---|---|
Measured | Predicted | |||||
1 | 0 | 0 | 0 | 84.35 | 84.08 | |
2 | 1 | 1 | 0 | 79.77 | 79.99 | |
3 | 0 | -1 | 1 | 65.57 | 65.39 | |
4 | 0 | -1 | -1 | 73.81 | 73.89 | |
5 | 1 | -1 | 0 | 76.88 | 77.20 | |
6 | 0 | 1 | -1 | 68.13 | 68.31 | |
7 | -1 | 0 | -1 | 68.21 | 68.34 | |
8 | 0 | 0 | 0 | 84.57 | 84.08 | |
9 | 1 | 0 | 1 | 68.35 | 68.21 | |
10 | 1 | 0 | -1 | 74.57 | 74.75 | |
11 | -1 | 0 | 1 | 71.86 | 72.25 | |
12 | -1 | -1 | 0 | 77.42 | 77.19 | |
13 | 0 | 0 | 0 | 83.78 | 84.08 | |
14 | 0 | 0 | 0 | 83.82 | 84.08 | |
15 | 0 | 1 | 1 | 74.83 | 74.18 | |
16 | 0 | 0 | 0 | 83.90 | 84.08 | |
17 | -1 | 1 | 0 | 78.49 | 78.18 |
Table 2 Measured and predicted adsorption rates of baicalin by Cu⁃NIC⁃TMED for the individual design points
Design point | Element A | Element B | Element C | Adsorption rate(%) | ||
---|---|---|---|---|---|---|
Measured | Predicted | |||||
1 | 0 | 0 | 0 | 84.35 | 84.08 | |
2 | 1 | 1 | 0 | 79.77 | 79.99 | |
3 | 0 | -1 | 1 | 65.57 | 65.39 | |
4 | 0 | -1 | -1 | 73.81 | 73.89 | |
5 | 1 | -1 | 0 | 76.88 | 77.20 | |
6 | 0 | 1 | -1 | 68.13 | 68.31 | |
7 | -1 | 0 | -1 | 68.21 | 68.34 | |
8 | 0 | 0 | 0 | 84.57 | 84.08 | |
9 | 1 | 0 | 1 | 68.35 | 68.21 | |
10 | 1 | 0 | -1 | 74.57 | 74.75 | |
11 | -1 | 0 | 1 | 71.86 | 72.25 | |
12 | -1 | -1 | 0 | 77.42 | 77.19 | |
13 | 0 | 0 | 0 | 83.78 | 84.08 | |
14 | 0 | 0 | 0 | 83.82 | 84.08 | |
15 | 0 | 1 | 1 | 74.83 | 74.18 | |
16 | 0 | 0 | 0 | 83.90 | 84.08 | |
17 | -1 | 1 | 0 | 78.49 | 78.18 |
Type | Sum of square | Degrees of freedom | Mean square | F value | P value |
---|---|---|---|---|---|
Model | 647.14 | 9 | 73.58 | 425.62 | <0.0001 |
A | 1.41 | 1 | 1.61 | 9.32 | 0.0185 |
B | 12.15 | 1 | 7.11 | 41.11 | 0.0004 |
C | 2.26 | 1 | 2.11 | 12.21 | 0.0101 |
AB | 1.83 | 1 | 0.83 | 4.79 | 0.0648 |
AC | 12.69 | 1 | 24.35 | 140.88 | <0.0001 |
BC | 55.85 | 1 | 55.8 | 322.79 | <0.0001 |
A2 | 28.38 | 1 | 35.18 | 203.53 | <0.0001 |
B2 | 39.62 | 1 | 39.25 | 227.06 | <0.0001 |
C2 | 458.3 | 1 | 459.43 | 2657.63 | <0.0001 |
Residual | 15.44 | 7 | 0.17 | ||
Lack of fit residuals | 14.94 | 3 | 0.24 | 1.87 | 0.2747 |
Pure error | 0.5 | 4 | 0.13 | ||
Sum | 662.58 | 16 |
Table 3 Statistical data obtained after implementing response surface methodology (ANOVA)*
Type | Sum of square | Degrees of freedom | Mean square | F value | P value |
---|---|---|---|---|---|
Model | 647.14 | 9 | 73.58 | 425.62 | <0.0001 |
A | 1.41 | 1 | 1.61 | 9.32 | 0.0185 |
B | 12.15 | 1 | 7.11 | 41.11 | 0.0004 |
C | 2.26 | 1 | 2.11 | 12.21 | 0.0101 |
AB | 1.83 | 1 | 0.83 | 4.79 | 0.0648 |
AC | 12.69 | 1 | 24.35 | 140.88 | <0.0001 |
BC | 55.85 | 1 | 55.8 | 322.79 | <0.0001 |
A2 | 28.38 | 1 | 35.18 | 203.53 | <0.0001 |
B2 | 39.62 | 1 | 39.25 | 227.06 | <0.0001 |
C2 | 458.3 | 1 | 459.43 | 2657.63 | <0.0001 |
Residual | 15.44 | 7 | 0.17 | ||
Lack of fit residuals | 14.94 | 3 | 0.24 | 1.87 | 0.2747 |
Pure error | 0.5 | 4 | 0.13 | ||
Sum | 662.58 | 16 |
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