Table 3: Matrix effect.

Concentration (ng/ml)TBM peak area (×104)IS peak area (×104)RatioMatrix effect
WaterM9WaterM9WaterM9TBMISRatio

Low (120)3.60 ± 0.123.83 ± 0.138.26 ± 0.498.72 ± 0.530.4360.439106106101
Medium (1500)18.1 ± 1.020.0 ± 1.48.80 ± 0.779.30 ± 0.912.062.15110106104
High (17000)378 ± 5413 ± 1813.7 ± 0.514.7 ± 0.727.628.1109107102

Data represent the mean peak area (±SD) from triplicate analysis.