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. Author manuscript; available in PMC: 2021 Oct 1.
Published in final edited form as: Biochem Pharmacol. 2020 Jun 27;180:114127. doi: 10.1016/j.bcp.2020.114127

Table 1.

Summary of analyte-specific mass spectrometry parameters.

Compound Parent Ion (m/z) Product Ion (m/z) Declustering Potential (V) Entrance Potential (V) Collision Energy (V) Collision Cell Exit Potential (V)
Gem 264.0 112.0 60 12 26 13
dFdU 265.0 113.0 60 12 22 13
V-Gem 363.1 264.0 6 8 22 14
13C,15N2-Gem (IS) 267.0 115.0 60 12 26 13
13C,15N2-dFdU (IS) 268.0 116.0 60 12 22 13

Gem, gemcitabine; dFdU, 2’,2’-difluorodeoxyuridine; V-Gem, 5’-l-valyl-gemcitabine; IS, internal standard.