Table 1 Linear regression of phenylpropanoic acids, 4-hydrocinnaldehydes and 4-hydroxycinnamyl alcohols for quantitative analysis
Compound | Ultraviolet wavelength (nm) | Retention time (min) | Regression equation | Correlation coefficient (R 2) |
|---|---|---|---|---|
p-Coumaric acid | 340 | 25.41 | y = 5.68E + 04x − 3.50E + 04 | 0.9998 |
Caffeic acid | 340 | 10.28 | y = 1.07E + 05x + 2.21E + 04 | 0.9998 |
Ferulic acid | 340 | 32.40 | y = 1.45E + 05x − 7.23E + 05 | 0.9958 |
p-Coumaraldehyde | 340 | 34.72 | – | – |
Caffeldehyde | 340 | 20.99 | – | – |
Coniferaldehyde | 340 | 40.83 | y = 5.43E + 05x − 9.79E + 05 | 0.9957 |
Sinapaldehyde | 340 | 43.91 | y = 3.30E + 05x − 3.86E + 05 | 0.9986 |
p-Coumaryl alcohol | 280 | 16.35 | – | – |
Caffeyl alcohol | 280 | 6.65 | – | – |
Coniferyl alcohol | 280 | 23.24 | y = 8.81E + 04x − 8.22E + 04 | 0.9997 |