Variation in Flavonoid Composition and Radical-Scavenging Activity in Ginkgo biloba L. due to the Growth Location and Time of Harvest
Table 6
TE values of G. biloba leaf in ABTS postcolumn assay.
Number of sample
Growing location
Time of harvest
TE (µmol g−1)
Quercetin
Kaempferol
Isorhamnetin
1
North
June
2.08 ± 0.01
1.76 ± 0.02
0.04 ± 0.01
July
5.76 ± 0.03
5.32 ± 0.05
0.40 ± 0.02
August
5.12 ± 0.02
4.72 ± 0.04
0.28 ± 0.01
September
5.46 ± 0.02
4.46 ± 0.04
0.18 ± 0.01
October
4.09 ± 0.02
4.12 ± 0.04
0.06 ± 0.00
2
West
June
3.20 ± 0.02
1.64 ± 0.06
0.28 ± 0.04
July
9.38 ± 0.03
5.86 ± 0.08
1.90 ± 0.08
August
8.94 ± 0.05
5.12 ± 0.04
1.54 ± 0.06
September
7.11 ± 0.01
4.61 ± 0.11
0.45 ± 0.03
October
8.42 ± 0.02
4.29 ± 0.05
1.00 ± 0.08
3
Central
June
2.00 ± 0.01
1.84 ± 0.02
0.24 ± 0.01
July
4.52 ± 0.02
4.16 ± 0.04
0.68 ± 0.01
August
5.76 ± 0.03
4.64 ± 0.04
1.12 ± 0.01
September
2.92 ± 0.01
3.39 ± 0.03
0.34 ± 0.01
October
3.97 ± 0.02
3.86 ± 0.03
0.26 ± 0.01
4
Southwest
June
2.56 ± 0.01
2.32 ± 0.02
0.16 ± 0.00
July
6.40 ± 0.03
8.00 ± 0.07
0.68 ± 0.03
August
4.96 ± 0.02
5.84 ± 0.05
0.64 ± 0.02
September
6.17 ± 0.03
6.18 ± 0.05
0.23 ± 0.02
October
4.18 ± 0.02
3.89 ± 0.03
0.25 ± 0.01
5
South
June
2.88 ± 0.01
1.60 ± 0.10
0.16 ± 0.00
July
5.84 ± 0.03
4.04 ± 0.04
0.64 ± 0.01
August
8.80 ± 0.04
4.72 ± 0.04
0.80 ± 0.00
September
6.86 ± 0.03
3.62 ± 0.03
0.25 ± 0.00
October
3.42 ± 0.02
1.98 ± 0.02
0.03 ± 0.00
Notes. () Different letters on columns show significant difference between time of harvest for each compound and growing location based on Tukey’s HSD test at ; () results are presented as the mean ± standard error () of the recorded concentrations.
