Abstract: β-conglycinin and glycinin were separated by large-capacity (250 × 4 mL) low-speed (5300 × g) centrifugation at the condition of alkali dissolution and acid precipitation. Results indicated that better centrifugation efficiency of soybean protein was in pH 8.5 Tris-HCl solution; The optimal pH values for precipitating glycinin andβ-conglycinin were 6.4 and 4.8, respectively. Meanwhile, the optimal pH for removing the impure proteins was 5.0. The enhancement of entrifugation efficiency was achieved by keeping turbid liquid at 4 ℃ for more than 2 h before centrifugation. Under the optimal conditions, the yields of glycinin andβ-conglycinin were 6.8% and 2.2%, respectively. The purities of separated proteins determined by SDS-PAGE were 89.1% and 78.9%. Low-speed centrifugation is suitable for separatingβ-conglycinin and glycinin.

Key words: β-conglycinin, glycinin, separation