Comparisons of Ethanol Extracts of Chinese Propolis (Poplar Type) and Poplar Gums Based on the Antioxidant Activities and Molecular Mechanism

Table 1

Total phenolic contents (TPC), total flavonoid contents (TFC), and flavanone and dihydroflavonol contents (FDC) of EECP and EEPG^a.

Sample^b	TPC (mg GAE/g)	TFC (mg RE/g)	FDC (mg NE/g)
EECP	192.80^** ± 10.85	297.24NS ± 10.32	229.64^** ± 7.05
EEPG	121.81 ± 8.83	297.09 ± 10.66	164.14 ± 4.95

 ^aData are shown as the mean ± SD (). ^bEECP and EEPG represent the ethanol extract of Chinese propolis (poplar type) and ethanol extract of Chinese poplar gum, respectively. NS means not significant; ^*means significant (); ^**means very significant (). GAE: gallic acid equivalent; RE: rutin equivalent; NE: naringenin equivalent.