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. Author manuscript; available in PMC: 2012 Jul 25.
Published in final edited form as: J Agric Food Chem. 2010 Sep 8;58(17):9384–9395. doi: 10.1021/jf904561e

Table 7.

Diagnostic shift in Band I and II of the mono-O-glucuronides of quercetin in relation to the quercetin

Compound/Glucuronide
(Retention time)
(Color of line in Fig. 7)		 λmax, nm Diagnostic shifts in
Band I and II		 Position of O-
glucuronidation
Band II Band I
Quercetin (2.87 min)
(Black solid)		 255.7 373.6
Glucuronide-I (1.04 min)
(Red dotted)		 255.7 371.2 −2.4 nm (Band I)
No change (Band II)		 7-O-G
Glucuronide-II (1.25 min)
(Blue dashed)		 258.2 356.2 −17.4 nm (Band I)
+2.5 nm (Band II)		 3-O-G
Glucuronide-III (1.47 min)
(Green dotted dashed)		 253.3 366.2 −7.4 nm (Band I)
− 2.4 nm (Band II)		 4’-O-G
Glucuronide-IV (1.80 min)
(Brown double dotted
dashed)		 253.3 371.2 − 2.4 nm (Band I)
− 2.4 nm (Band II)		 3’-O-G