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Biodegradable Films from Isolate of Sunflower (Helianthus annuus) Proteins

Abstract : The film-forming potential of isolate of sunflower proteins (ISFP) was investigated. Homogeneous films were obtained by dissolution of ISFP in alkaline water (pH 12), addition of a plasticizer, casting, and drying. Maximum protein solubilization and unfolding led to films with the highest elasticity. The effects of five dissolving bases and five plasticizers on the mechanical properties were studied. The use of ionic bases (LiOH, NaOH) capable of interfering with the interproteic noncovalent bonds resulted in the greatest tensile strength (σmax) and elongation at break (εmax) values (3.9 MPa and 215−251%, respectively). Plasticizers conferred diverse tensile properties to the films:  the use of 1,3-propanediol resulted in the highest σmax (27.1 MPa), and glycerol resulted in the greatest εmax (251%). Different mechanical properties were obtained by using mixtures of these plasticizers.
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Fabiola Ayhllon-Meixueiro, Carlos Vaca-Garcia, Françoise Silvestre. Biodegradable Films from Isolate of Sunflower (Helianthus annuus) Proteins. Journal of Agricultural and Food Chemistry, American Chemical Society, 2000, 48 (7), pp.3032-3036. ⟨10.1021/jf9907485⟩. ⟨hal-02079345⟩



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