The reducing power of ginger rhizomes was measured by the FRAP method and the results were also expressed as the equivalent of the standard Trolox for comparison. The FRAP values of ethanolic extracts were 7.2e8.0-fold higher than those of aqueous extracts
for both ginger rhizomes (Table 4). However, the FRAP values of ethanolic extracts from CG and GG were comparable whereas the FRAP values of the aqueous extract from GG was higher than that from CG (P < 0.05). With regard to the TEAC and FRAP methods,
both ethanolic extracts were more effective than both aqueous extracts.