A new HPLC method for simultaneous determination of neopterin, creatinine, kynurenine and tryptophan
in human serum was developed and validated. Monolithic stationary phase’s technology (two monolithic
columns RP-18e were connected with guard monolithic cartridge 4.6mm×50mm+ 3.0mm×100mm
and 4.6×10mm) and special auto sampler for micro titration plates (samples are storage in dark cooled
place protected against evaporation) were combined with easy sample preparation step. As mobile phase
15 mmol/L phosphate buffer at pH 4.50 was used. Neopterin and tryptophan were detected using fluorescent
detection and kynurenine and creatinine were detected by diode-array detection. This method
may be suitable for large sequences of samples in clinical research and routine practice