Identification of metabolites of [2-14C]quercetin-4′-glucoside isolated from rat plasma and tissues
HPLC retention times, negative ion MS-MS fragmentation patterns, and identification of metabolites isolated from rat tissues and plasma after oral ingestion of [2-14C]quercetin-4′-glucoside. Peak numbers refer to peaks in Figure 1. Comprehensive descriptions of peak identifications are published in Mullen et al. (2002).
Peak | Rt | Compound | [M — H]- | MS2 Fragment Ions |
|---|---|---|---|---|
| min | m/z | m/z | ||
| 1 | 9.30 | Not identified | ||
| 2 | 12.04 | Not identified | ||
| 3 | 17.22 | Quercetin diglucuronide | 653 | 477 ([M — H]--GlcUA), 301 ([M — H]--GlcUA-GlcUA) |
| 4 | 20.05 | Not identified | ||
| 5 | 21.32 | Methylated quercetin diglucuronide | 667 | 491 ([M — H]--GlcUA). 315 ([M — H]--GlcUA-GlcUA) |
| 6 | 23.10 | Quercetin diglucuronide | 653 | 477 ([M — H]--GlcUA), 301 ([M — H]--GlcUA-GlcUA) |
| 7 | 24.24 | Quercetin diglucuronide | 653 | 477 ([M — H]--GlcUA), 301 ([M — H]--GlcUA-GlcUA) |
| 8 | 24.40 | Methylated quercetin diglucuronide | 667 | 491 ([M — H]--GlcUA), 315 ([M — H]--GlcUA-GlcUA) |
| 9 | 24.92 | Quercetin diglucuronide | 653 | 477 ([M — H]--GlcUA), 301 ([M — H]--GlcUA GlcUA) |
| 10 | 26.27 | Quercetin diglucuronide | 653 | 477 ([M — H]--GlcUA), 301 ([M — H]--GlcUA-GlcUA) |
| 11 | 27.95 | Quercetin diglucuronide | 653 | 477 ([M — H]--GlcUA), 301 ([M — H]--GlcUA-GlcUA) |
| 12 | 29.38 | Quercetin-3-glucuronide | 477 | 301 ([M — H]--GlcUA) |
| 13 | 29.54 | Quercetin monoglucuronide sulfate | 557 | 477 ([M — H]--SO3), 381 ([M — H]--GlcUA), 301 ([M — H]--SO3-GlcUA) |
| 14 | 30.26 | Methylated quercetin diglucuronide | 667 | 491 ([M — H]--GlcUA), 315 ([M — H]--GlcUA-GlcUA) |
| 15 | 31.12 | Quercetin monoglucuronide | 477 | 301 ([M — H]--GlcUA) |
| 16 | 31.77 | Methylated quercetin monoglucuronide sulfate | 571 | 491 ([M — H]--SO3), 395 ([M — H]--GlcUA), 315 ([M — H]--SO3-GlcUA) |
| 17 | 33.16 | Quercetin monoglucuronide sulfate | 557 | 477 ([M — H]--SO3), 381 ([M — H]--GlcUA), 301 ([M — H]--SO3-GlcUA) |
| 18 | 33.87 | Quercetin-4′-glucoside | 463 | 301 ([M — H]--Glc) |
| 19 | 35.01 | Methylated quercetin monoglucuronide | 491 | 315 ([M — H]--GlcUA) |
| 20 | 35.89 | Methylated quercetin monoglucuronide | 491 | 315 ([M — H]--GlcUA) |
| 21 | 36.70 | Methylated quercetin monoglucuronide | 491 | 315 ([M — H]--GlcUA) |
| 22 | 36.74 | Quercetin monoglucuronide | 477 | 301 ([M — H]--GlcUA) |
| 23 | 38.70 | Quercetin monoglucuronide | 477 | 301 ([M — H]--GlcUA) |
| 24 | 43.73 | Quercetin | 301 | |
| 25 | 50.36 | Methylated quercetin sulfate | 395 | 315 ([M — H]--SO3) |
| 26 | 50.56 | Quercetin sulfate | 381 | 301 ([M — H]--SO3) |
| 27 | 52.38 | Isorhamnetin |
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Rt, retention time; [M — H]-, molecular ion; m/z, mass-to-charge ratio; GlcUA, glucuronyl unit; Glc, glucosyl unit.