35-2

C. PÉREZ PÉREZ, Dept. Ingeniería Bioquímica, Instituto Tecnológico de Celaya., Av. Tecnológico y García Cubas, Celaya, Gto., 38010, Mexico, E. Lima Lima, Ingenieria Bioquimica, Instituto Tecnologico de Celaya, Ave. Tecnologico y A. Garcia Cubas S/N, Celaya, Guanajuato, 38010, Mexico, S. Altamirano Romo, Ingenieria Bioquimica, IT Celaya, R. Rivas Araiza, CINVESTAV- QUERETARO, Libramiento norponiente 2000, Frac. Real de Juriquilla, Queretaro, Qro., 76230, Mexico, and G. Luna Barcenas, CINVESTAV - QUERETARO, Libramiento norponiente 2000, Frac. real de Juriquilla, Queretaro, Qro, 76230, Mexico.

Sodium Caseinate (SC) is a food ingredient widely used because of its biocompatibility and non-toxicity. Sodium caseinate has the capability to carry nutraceuticals and could be interesting due to favorable functional properties as well as good nutritional value. Effects of glycerol and nutraceutical substances on microstructural, thermal and physico-chemical properties as well as moisture content of SC films were evaluated. The film production was carried out based on dispersion of sodium caseinate in aqueous media carrying glycerol and a high concentration of calcium gluconate-lactate and vitamin C, casted in a thin layer and dried at room temperature. The addition of nutraceutical substances seemed to be essential in order to form an homogeneous and transparent film, as was suggested by SEM. The increase in water or glycerol contents led to increase the water vapor permeability and % elongation; and decrease in tensile strength, elastic modulus and glass transition temperatures of the films. Nutraceutical presence showed a lower value of these functional properties. Glycerol content of the films correlated well with glass transition temperatures (Tg=150 to 77, when glycerol content is going to 0 to 30 wt/wt SC). Films containing nutraceutical showed a decrease on the Tg value. Films containing nutraceutical showed a higher water adsorption and the GAB model was the most appropriate for the prediction of sorption isotherm. Potential application of SC-nutra-ceutical based edible films would meet the high market demands for functional foods.

Session 35, Nutraceutical & Functional Foods: General I
9:00 AM - 12:00 PM, Monday AM Room 398

2005 IFT Annual Meeting, July 15-20 - New Orleans, Louisiana