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Summary of UV spectral data for kaempferol and the metabolites (shifts of less than 3 nm were not considered to be significant).
| Compound | Band I max (nm) | Band II max (nm) | Shifts in relation to aglycone (nm) | Identification |
|---|---|---|---|---|
| kaempferol | 365 | 266 | - | - |
| G1 | 362 | 258 | −8 (Band II) | kaempferol-5-glucuronide |
| G2 | 347 | 265 | −18 (Band I) | kaempferol-3-glucuronide |
| G3 | 365 | 265 | no change | kaempferol-7-glucuronide |
| G4 | 361 | 266 | −4 (Band I) | kaempferol-4′-glucuronide |
| S1 | 366 | 266 | no change | kaempferol-7-sulfate |
