Table 2. Box-Behnken response surface design and respond values

Sample	Parameters1)			Relative peak area2)
	X1	X2	X3	Y13)	Y24)
1	33	30	60	822.91	463.05
2	100	30	60	778.28	435.27
3	33	70	60	1,169.80	635.89
4	100	70	60	1,166.63	673.91
5	33	50	30	1,146.99	668.44
6	100	50	30	1,175.70	664.76
7	33	50	90	1,197.80	671.68
8	100	50	90	1,132.09	627.36
9	66	30	30	1,015.60	559.82
10	66	70	90	1,213.81	684.21
11	66	30	90	879.36	485.76
12	66	70	30	1,205.36	682.34
13	66	50	60	1,158.44	635.28
14	66	50	60	1,157.70	632.48
15	66	50	60	1,147.52	633.35

Ultrasound amplitude (X₁; 33%, 66%, and 100%), sonication temperature (X₂; 30°C, 50°C, and 70°C), sonication time (X₃; 30, 60, and 90 min).
Mean values of relative peak area to the area of internal standard.
The content of total peak area.
The content of D-Limonene.