Biology Reference
In-Depth Information
Table 6.2.
Singlet oxygen total quenching rate constants (K
Q
), HOMO energies and LogP for a series of
flavonoids and other antioxidants.
10
−8
K
Q
(mol.l
−1
.s
−1
)
LogP Experimental
(theoretical)
Antioxidant
E
HOMO
(eV)
b
-Carotene
100
(15.5)
Lycopene
200
(15.5)
a
-Tocopherol
2.0
(11.9)
HO
O
l
-Histidine
0.9
(−1.3)
DPBF
200
(6.5)
O
CH
3
Trolox
−8.90
1.2
2.4 (3.0)
HO
O
H
3
C
O
CH
3
OH
CH
3
O
OH
Gallic acid
−9.32
0.05
(0.9)
OH
HO
OH
Ascorbic acid
11.20
2.0
(−2.4)
O
OH
Kaempferol
−9.04
0.005
2.72 (2.1)
OH
O
HO
OH
OH
O
Rutin
−9.06
1.2
−2.7 (1.8)
ORutinoside
HO
O
OH
OH
OH
O
Quercetin
−9.05
4.6
2.26 (2.1)
OH
HO
O
OH
OH
OH
O
Myricetin
−9.06
5.1
(−0.5)
OH
OH
HO
O
OH
OH
O
Fisetin
−8.99
0.01
2.20 (2.1)
OH
O
HO
OH
OH
OH
O
Apigenin
−9.16
0.28
2.62 (2.1)
HO
O
OH
Continued
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