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The mobilities in buffer and nanogel demonstrated that 20-30% nanogel supports sieving of proteins ranging from 20 to 80 kDa. Capillary separations based on sieving rather than electrophoresis had similar precision in both area and migration time as well as similar separation efficiencies. However, the migration time increased with gel concentration. The nanogel was used for the analysis of proteins in human serum. Proteins in the sample were more effectively resolved and quantified with capillary sieving compared to free-solution capillar