Table 2.

Thermodynamic parameters for traditional hydrolysis and sweeping frequency ultrasound pretreatment

Hydrolysis	Ea (kJ/mol)	ΔH (kJ/mol)	ΔS (J/mol K)	ΔG (kJ/mol)
Traditional hydrolysis	48.55 ± 1.97a	46.05 ± 0.99a	− 154.47 ± 3.02a	93.63 ± 1.11a
SFU pretreatment	39.06 ± 1.21b (− 19.52%)*	36.55 ± 1.35b (− 20.63%)*	− 163.98 ± 2.98b (− 6.16%)*	87.06 ± 1.34b (− 7.02%)*

Values followed by different letters are significantly different at P < 0.05

The values of $\mathrm{\Delta }H$, $\mathrm{\Delta }S$ and $\mathrm{\Delta }G$ were compared by rows

*Decreases in thermodynamic parameters for sweeping frequency ultrasound pretreatment compared with traditional enzymatic hydrolysis