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BMR).A new approach to the quantitative analysis of aromatic metabolites in cerebrospinal fluid samples of neurosurgical patients based on microextraction by packed sorbent coupled with derivatization and GC-MS was developed. Analytical characteristics such as recoveries (40-90%), limit of detection (0.1-0.3 μm) and limit of quantitation (0.4-0.7 μm) values, accuracy ( less then ±20%), precision ( less then 20%) and linear correlations (R2 ≥ 0.99) over a 0.4-10 μm range of concentrations demonstrated that microextraction by packed sorbe