Table 2 Quantity of 6-, 8- and 10-gingerol and 6-shogaol in black ginger

Steaming and drying step	Sample composition (mg/g)
	6-gingerol	8-gingerol	10-gingerol	6-shogaol
	0	3.257 ± 0.067	0.916 ± 0.005	1.106 ± 0.125	1.299 ± 0.050
1	2.896 ± 0.165	1.034 ± 0.123	1.034 ± 0.078	1.409 ± 0.013
2	1.904 ± 0.030	1.092 ± 0.089	1.042 ± 0.102	1.894 ± 0.017
3	1.876 ± 0.004	1.005 ± 0.092	1.043 ± 0.091	2.370 ± 0.083
4	1.537 ± 0.115	1.007 ± 0.007	0.959 ± 0.028	2.485 ± 0.065
5	1.003 ± 0.118	1.106 ± 0.005	0.888 ± 0.006	2.774 ± 0.026
6	0.957 ± 0.041	1.055 ± 0.055	0.715 ± 0.159	2.999 ± 0.089
7	0.710 ± 0.043	0.930 ± 0.069	0.778 ± 0.022	2.620 ± 0.212
8	0.560 ± 0.052	0.930 ± 0.064	0.747 ± 0.047	2.335 ± 0.168
9	0.567 ± 0.036	0.929 ± 0.006	0.806 ± 0.026	2.099 ± 0.039

Values are the average of three replicates ± SD.