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Quantitative determination of concentrations of β-blockers in serum samples. a) The extracted linear curve of metoprolol in serum from 0.267 ng/mL to 26.7 ng/mL and b) 0.534 ng/mL to 5.34 ng/mL. c) The extracted linear curve of pindolol in serum in the range from 0.249 ng/mL to 24.9 ng/mL. and d) The extracted linear curve of a mixture containing metoprolol and pindolol in serum from 0.249 to 26.7 ng/mL.
