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Case Control Study
©The Author(s) 2025.
World J Gastrointest Oncol. Sep 15, 2025; 17(9): 109777
Published online Sep 15, 2025. doi: 10.4251/wjgo.v17.i9.109777
Table 1 Stability of internal standard responses in quality control samples
Internal standard
Retention time
Mass-to-charge ratio (mz)
RSD
IS1222.6121.04390.0374
IS2159.2133.10570.0262
IS3231.2152.05910.0662
IS428.5127.08050.0444
IS5160.4127.14280.0466
IS6157.5135.12080.029


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