| Conc.
          (mg/ml) | 
        Accuracy    (%) | 
        Intra-day    precision (RSD1 | 
        Inter-day    precision (RSD %) | 
       
      
        | 0.625  | 
        97.46  | 
        1.8  | 
        2.3 | 
       
      
        | 5.00 | 
        101.0 | 
        1.7 | 
        0.78 | 
       
      
        | 15.0 | 
        97.27 | 
        0.28 | 
        3.2 | 
       
     
      *Separation conditions: capillary 50 μm i.d. (50 cm total and 41.5 cm effective
    length), buffer
    phosphate 72 mM, pH=3.50, temperature: 35°C, voltage: -30 kV.  
    1. Relative standard deviation |