Table 1: Orthogonal design and experimental results.

No.Ethanol concentrationSolid-liquid ratioNumber of extractionsUltrasonic timeTPC (mg/g)Chlorogenic acid (mg/g)

111113.48 ± 0.380.89 ± 0.07
212225.81 ± 0.441.36 ± 0.12
313334.47 ± 0.411.02 ± 0.11
421235.01 ± 0.461.19 ± 0.14
522314.31 ± 0.410.98 ± 0.12
623123.53 ± 0.370.86 ± 0.06
731325.21 ± 0.471.29 ± 0.13
832134.23 ± 0.391.13 ± 0.09
933215.57 ± 0.521.39 ± 0.12
t 4.594.563.754.45
t 4.284.785.464.85
t 5.004.524.464.57
0.720.261.710.39
1.091.120.961.09
1.011.161.311.17
1.271.091.101.11
0.260.070.350.08

: total phenolic compounds; : chlorogenic acid.