Table 2.

Gingerol and shogaol contents of ginger extracts after 6 types of pre-treatment processes.

	GJ	GT	HW	HWE	HP	HPE	F-Value
6G (mg/g)	0.81 ± 0.00 f	1.27 ± 0.02 e	2.28 ± 0.03 c	7.03 ± 0.01 a	2.18 ± 0.03 d	6.30 ± 0.01 b	50,470.25 ***
8G (mg/g)	0.17 ± 0.00 f	0.22 ± 0.00 e	0.50 ± 0.00 c	1.67 ± 0.00 a	0.47 ± 0.00 d	1.53 ± 0.00 b	79,353.60 ***
10G (mg/g)	0.48 ± 0.00 f	0.73 ± 0.01 e	1.37 ± 0.01 c	4.08 ± 0.01 a	1.31 ± 0.01 d	3.60 ± 0.03 b	52,907.18 ***
6S (mg/g)	0.29 ± 0.00 f	0.44 ± 0.00 e	0.86 ± 0.00 c	2.52 ± 0.01 b	0.83 ± 0.00 d	2.62 ± 0.01 a	116,407.04 ***
8S (mg/g)	0.00 ± 0.00 d	0.00 ± 0.00 d	0.04 ± 0.00 c	0.39 ± 0.00 b	0.04 ± 0.00 c	0.41 ± 0.00 a	10,460.00 ***
10S (mg/g)	0.15 ± 0.01 c	0.22 ± 0.02 c	0.48 ± 0.03 b	1.44 ± 0.09 a	0.46 ± 0.03 b	1.44 ± 0.01 a	574.91 ***

Data represent mean value ± standard deviation. Horizontally, lowercase letters represent significant content differences between extracts (p < 0.05). GJ, squeezed raw ginger; GT, ginger tea; HW, hydrothermal extraction; HWE, hydrothermal enzyme-assisted extraction; HP, high-pressure extraction; HPE, high-pressure enzyme-assisted extraction; 6G, 6-gingerol; 8G, 8-gingerol; 10G, 10-gingerol; 6S, 6-shogaol; 8S, 8-shogaol; 10S, 10-shogaol; ***, p < 0.001.