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A method was developed by which films could be prepared from commercial isolated soy protein (ISP). ISP was treated -with alkali (ATISP) to alter film orooerties. Water vaoor oermeabilitv (WVP). oxygen 'permeability (G,Pj, tensile strength'(TSj, percent &ngatidn (%E), and appearanceof ISP and ATISP were compared. Alkali-treatment had no effect on WVP. 0,P. and TS. gave hieher %E. and improved film appearance. Films properties 'were alsoY compared at pH 6, 8, 10, and 12. In general, pH 6 gave higher WVP and OzP and lower TS and %E; while higher pH gave lower WVP and OaP and higher TS and %E. ATISP films could not be produced at pH 6. Film appearance generally improved with increased pH.