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Abstract: Water extraction of soybean oil was studied to find the optimal conditions for recovery of oil pre-enriched protein and for aqueous extraction of soybean oil. Orthogonal tests were employed in the procedures of oil pre-enrichment and aqueous extraction. Soybeans were crushed to pass a 40 mesh sieve, soaked under the optimum conditions (solid/water=1/5(w/v), 40 °C, pH 10, 3 h) and water-ground to 100 mesh, stirred in 65 °C water for 20 min, and centrifuged at 1400 g to separate oil pre-enriched protein. The protein yield was 17.8 g from 100 g soybeans, which contained 62.8% oil. The oil yield was 69.0%. Optimum conditions for the aqueous extraction procedure were: solid-to-water ratio 1:2, pH 9.0, time 30 min, stirring in boiling water bath, stationary time 10 min, centrifuge at 3600 g for 10 min. Experimental values showed that the oil yield after aqueous extraction from oil pre-enriched protein reached 88.3%, so the total oil extraction rate was 60.8%.

[1] Adler-Nissen, Jens Lorenz. 1978. Preparation of Polypeption from Soy Protein. U.K. Patent, 4100024.

[2] AOAC, 1990. Official Methods of Analysis, 15th ed., Association of Official Analytical Chemists, Washington, DC.

[3] Lawhon,J.T., Manak, L.J., Rhee,K.C. et al., 1981. Combining aqueous extraction and membrane isolation techniques to recover protein and oil from soybean. J Food Sci, 46: 912-918.

[4] Rhee,K.C, 1972. Simultaneous recovery of protein and oil from raw peanuts in an aqueous system. J Food Sci, 37: 90-93.

[5] Sugarman, N., 1956. Process for Extraction of Oil and Protein Simultaneously from Oil-bearing Material. U.S. Patent, 2762820.

[6] Wang, Z, Xu, S.Y, Lin, L. et al., 1994. Study on the enzymatic process of simultaneously preparing soy oil and soy protein hydrolysate from full fat soybean. J. Wuxi Institute of Light Industry, 13(3): 179-190 (in Chinese, with English abstract).

[7] WLII (Wuxi Light Industry Institute), 1983. Food Analysis, Light Industry Publishing House, Beijing (in Chinese).