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. 2019 Oct 1;7:210. doi: 10.3389/fcell.2019.00210

TABLE 2.

MS/MS parameters for detection of de novo formed sphingolipids using the TQ MS system.

Collision Dwell
Sphingolipid species Mass transition (m/z) energy (eV) time (ms)
3KS-d5 305.3 → 273.3 19 160
d18:0 Sph-d5 307.3 → 289.3 15 160
Cer d18:0-d5/16:0-d3 548.6 → 530.6 15 160
548.6 → 289.3 25 160
Cer d18:1-d5/16:0-d3 528.6 → 269.3 25 160
REFERENCE COMPOUNDS
d17:0 Sph (IS)a 288.5 → 270.5 12 160
Cer d18:1/17:0 (IS)b 534.5 → 264.3 25 160
d18:0 Sph 302.3 → 284.3 15 160
Cer d18:0/16:0 540.5 → 522.5 15 160
540.5 → 284.3 25 160
Cer d18:1/16:0 520.5 → 264.3 25 160

aUsed as internal standard (IS) for labeled 3KS and d18:0 Sph. bUsed as IS for labeled C16 dhCer and C16 Cer.