Table 1 MRM transitions, collision energies, and fragment or voltages for all targeted compounds.

From: LC–MS/MS-based quantification of tryptophan, kynurenine, and kynurenic acid in human placental, fetal membranes, and umbilical cord samples

Compound

Monitored MRM (collision energy)

Fragment or voltages

[13C11, 15N2]—TRP

218.1 → 127 (33), 218.1 → 156 (21)

88

TRP

205.1 → 118 (33), 205.1 → 146 (21)

88

[2H5]—KYNA

195.1 → 121 (41), 195.1 → 149 (21)

112

KYNA

190 → 116 (41), 190 → 144 (21)

112

[13C6]—KYN

215 → 100 (13), 215 → 152 (25)

88

KYN

209.1 → 94 (13), 209.1 → 146 (25)

88

  1. TRP tryptophan, KYNA kynurenic acid, KYN kynurenine.
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