Table 2.
Quadratic polynomial equations of extraction yield and the contents of cormarin, cinnmic acid, cinnamaldehyde, and cinnamyl alcohol from Cinnamomum cassia blume by subcritical extraction process
| Response | Quadratic polynomial equation | R2 | Lack of fit (p value) |
|---|---|---|---|
| Extraction yield (%) | Y1 = 11.7233 + 2.4163X1 + 0.8725X2 + 0.1088X3 − 0.0567X21 − 0.2342X22 − 0.2617X23 − 0.0725X1X2 − 0.0050X1X3 − 0.4425X2X3 | 0.912 | 0.718 |
| Content of coumarin (%) | Y2 = 9.3733 − 3.3350X1 − 0.8150X2 − 0.5250X3 + 1.1621X21 + 0.4071X22 + 0.4521X23 + 0.3375X1X2 + 0.1775X1X3 + 0.8125X2X3 | 0.986 | 0.316 |
| Content of cinnaic acid (%) | Y3 = 3.80333 − 0.91875X1 − 0.16625X2 − 0.06250X3 + 0.03708X21 − 0.17792X22 − 0.27542X23 + 0.16250X1X2 − 0.00500X1X3 + 0.15000X2X3 | 0.982 | 0.744 |
| Content of cinnamaldehyde (%) | Y4 = 38.0700 − 14.9538X1 − 4.2113X2 − 2.4300X3 + 0.8962X21 − 4.5388X22 − 6.2362X23 + 0.3125X1X2 + 2.8400X1X3 + 4.5050X2X3 | 0.990 | 0.855 |
| Content of cinnamyl alcohol (%) | Y5 = 2.89667 − 0.50000X1 − 0.11000X2 − 0.070000X3 + 0.50292X21 + 0.34292X22 + 0.23292X23 + 0.12250X1X2 + 0.03250X1X3 + 0.10750X2X3 | 0.990 | 0.810 |
X1 = extraction temperature (°C), X2 = extraction time (min), X3 = extraction pressure (bar), Y1 = extraction yield (%), Y2 = content of coumarin (%), Y3 = content of Cinnamic acid (%), Y4 = content of cinnamaldehyde (%), Y5 = content of cinnamyl alcohol (%)