Table 1.

Total phenolic, total flavonoid, antioxidant activity and correlation coefficients of CBM propolis. Note: Data are shown as the mean ± SD (n = 3). GAE, gallic acid equivalent; QE, quercetin equivalent.

Sample No.	Origin (City/Province)	Collection Date	Total Flavonoids (mg/g, QE)	Total Phenolics (mg/g, GAE)	DPPH Scavenging Activity (IC50,μg/mL)	Correlation Coefficients
1	Jixi, Heilongjiang	May 2015	117.8 ± 5.9	284.2 ± 0.4	231.1 ± 4.2	0.957
2	Jixi, Heilongjiang	May 2015	105.2 ± 5.7	253.0 ± 6.8	222.5 ± 9.2	0.982
3	Mudanjiang, Heilongjiang	May 2015	95.5 ± 6.0	243.4 ± 3.3	256.7 ± 9.0	0.968
4	Jixi, Heilongjiang	May 2015	113.6 ± 2.1	285.4 ± 3.7	233.2 ± 4.2	0.986
5	Jixi, Heilongjiang	May 2015	121.7 ± 1.4	263.2 ± 1.5	231.2 ± 10.5	0.983
6	Shuangyashan, Heilongjiang	May 2016	114.3 ± 5.4	262.7 ± 1.9	267.5 ± 6.3	0.904
7	Qiqihaer, Heilongjiang	May 2016	111.4 ± 4.4	286.9 ± 0.4	221.2 ± 9.4	0.984
8	Qitaihe, Heilongjiang	May 2016	105.4 ± 4.5	316.8 ± 1.2	204.5 ± 1.1	0.939
9	Jixi, Heilongjiang	May 2016	98.3 ± 4.8	215.6 ± 0.4	278.5 ± 2.9	0.982
10	Jixi, Heilongjiang	May 2016	123.1 ± 2.8	298.1 ± 1.6	193.6 ± 8.1	0.966
11	Shuangyashan, Heilongjiang	May 2016	106.8 ± 6.0	273.7 ± 3.7	215.5 ± 2.8	0.879
12	Shuangyashan, Heilongjiang	May 2016	108.3 ± 2.7	255.8 ± 1.6	184.3 ± 4.7	0.928
13	Qitaihe, Heilongjiang	May 2016	114.1 ± 5.2	299.6 ± 0.8	188.8 ± 2.4	0.721
14	Mudanjiang, Heilongjiang	May 2016	105.5 ± 2.8	275.6 ± 2.9	170.4 ± 2.5	0.955
15	Jixi, Heilongjiang	May 2016	106.9 ± 1.9	268.7 ± 4.2	183.9 ± 7.4	0.721
16	Haerbin, Heilongjiang	July 2016	90.5 ± 2.9	265.4 ± 3.9	188.3 ± 3.5	0.949
17	Jiilin, Jilin	July 2016	123.1 ± 7.5	300.6 ± 1.6	171.9 ± 2.0	0.902
18	Jiilin, Jilin	July 2016	97.7 ± 3.7	257.1 ± 4.0	234.4 ± 0.7	0.986
19	Dunhua, Jilin	July 2016	101.1 ± 2.1	247.5 ± 1.6	263.1 ± 3.3	0.983
20	Jiilin, Jilin	July 2016	106.7 ± 5.4	250.3 ± 1.5	248.6 ± 2.9	0.966
21	Jiilin, Jilin	July 2016	108.9 ± 1.6	245.2 ± 2.4	262.9 ± 3.0	0.778