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

Table 3

Free radical scavenging activities and reducing power of EECP and EEPG.

Sample^a	DPPH (IC50)	ABTS (IC50)	RP (mmol TE/g)	SRSA (mmol TE/g)	ORAC (mmol TE/g)
EECP	32.35NS ± 2.84	40.5^** ± 2.38	2.08^** ± 0.08	1.52^** ± 0.03	9.25^* ± 0.85
EEPG	31.83 ± 2.68	55.4 ± 1.49	1.55 ± 0.05	0.67 ± 0.02	6.43 ± 0.46

 ^aData are showed as the mean ± SD (); statistical analysis were used to compare EECP with EEPG for every index, separately. NS means not significant (); ^*means significant (); ^**means very significant (). DPPH and ABTS are expressed as IC50 (μg/mL); FRAP, SRSA, and ORAC are expressed as millimoles Trolox equivalents (TE) per gram of sample.