Abstract

MONTENEGRO ALVAREZ DE TEJERA, P. et al. Development and validation of a method for simultaneous determination of pseudouridine and creatinine in human urine: Evaluation's Index Pseudouridona/Creatinine in smokers and no-smokers. Sanid. Mil. [online]. 2012, vol.68, n.1, pp.22-26. ISSN 1887-8571.  https://dx.doi.org/10.4321/S1887-85712012000100004.

Introduction: The excretion of pseudouridine is increased in inflammatory processes related to a muscle mass loss found in patients with pulmonary involvement. Material and Methods: A rapid and sensitive method for cuantification and simultaneous determination of pseudouridine, a breakdown product of tRNA, and creatinine in human urine via HPLC was developed and validated. The mobile phase was 0.01 mol phosphate buffer (pH 6.1) containing 3 mmol octanesulphonic acid as ion pairing agent. Sample preparation is based on dilution and filtration. A LiCHros-pher^® 100 RP-18 (5 μm) LiCHroCART^® 250-4 (Merck) column with precolumn LiCHrospher^® 100 RP-18 (5 μm) LiCHroCART^® 50-4 (Merck) were used, flow rate of 1ml/min. Detection wavelength was set at 250 nm. Results: The analysis time was 17 min per sample. The calibration range of pseudouridine (Psu) and creatinine (Crea) were 0.23-22.5 and 11.45-1100 nmol/ml. The linearity of the method was r2 = 0.997 and 0.998 and the lower limit of quantification (LLOQ) was 0.175 and 8.59 nmol/ml respectively. The average recovery (%) was 95.55 for pseudouridine and 97.82 for creatinine by addition and 93.16 and 89.79 % by dilution. The estimation of the coefficients of variation were < 8% for all levels. Conclusions: A positive correlation was found between expected and observed values (Pearson correlation coefficient = 0.99 for pseudouridine and 0.99 for creatinine). A correlation was found between recovery of pseudouridine and recovery of creatinine (Pearson correlation coefficient = 0.86). This method was used to assess pseudouridine excretion in 30 healthy subjects (18 non-smokers and 12 smokers). There were no statistically differences between non-smokers and smokers.

Keywords : Pseudouridine; Creatinine; Validation; RP-HPLC; Chromatography.

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