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The major exopolysaccharide fraction (EPSa) of Bifidobacterium animalis RH was purified to illustrate the chemical characterization and the antioxidant activity in vitro. The molecular weight of EPSa was 2.31 × 104 Da determined by the gel permeation chromatography (GPC). Fourier-transform infrared spectra (FT-IR) and the monosaccharide analysis of high-pH anion-exchange chromatography with pulsed...