Methods Bias % Slope Intercept SE 95 CI % r CE- TINIA -0.25 -0.67 -0.17 1.03 0.016 0.089 -0.14 - 0.1821 0.9925 CE–HPLC 0.07 -0.26-0.40 1.063 -0.52 0.048 -0.63-(-0.46) 0.9934 CE- Affinity chromatography -0.03 - 0.42-0.35 1.00 1.1185 0.065 0.0 -0.29 0.9974

Table 2: Comparison of capillary electrophoresis with TINIA, boronate affinity chromatogram and cation-exchange HPLC method: Individual results for the method-comparison studies (n=224).