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Table 1 Mass transitions and method statistics for the determination of plasma SAM and SAH

From: Plasma S-adenosylmethionine, DNMTpolymorphisms, and peripheral blood LINE-1 methylation among healthy Chinese adults in Singapore

        Inter-assay precision
Analyte Analyte Labeled Labeled isotope Retention time LOQ Calibration Level 1 Level 2
  MRM (m/z) isotope MRM (m/z) (minutes) (nmol/L) curve (CV%) (CV%)
SAM 399 → 250 2H3-SAM 402 → 250 7.1 5 400 – 25 nmol/L 9.2 6.2
SAH 385 → 136 2H4-SAH 389 → 138 6.8 5 400 – 25 nmol/L 10.4 5.9