Quality properties and mathematical modeling of vinasse films obtained under different conditions

Abstract

Vinasse (pisco distillation waste) is a promising feedstock for developing new high value-added bioproducts because it is supporting sustainable production as an agroindustrial by-product. The aims of this study were to evaluate experimental drying curves (60°C and 80°C); mathematical modeling of films and the effect of the drying conditions on quality properties of vinasse films plasticized with glycerol at different pH. The results indicated that as the drying temperature increased, the moisture ratio decreased for all films. The Weibull model obtained the best-fit quality of experimental results. The effective moisture diffusivity varied between 2.234 and 2.513 × 10−11 m2/s. The optimal conditions were found at 80°C and pH 11 for films. Under these conditions, the films presented a higher tensile strength (26.54 MPa), lower elongation at break (6.82%), and a higher Young´s Modulus (385.32 MPa). Thus, vinasse films could be used as packaging or coating materials in the food industry. Practical applications Currently, one of the most relevant challenges is the valorization of agroindustrial wastes, since promoting the sustainability and bioconversion of agro-industrial residues. In the case of the winery, this produces high amounts of wastes per annum in the different processes of production. These wastes can represent important environmental problems caused by their composition and organic burden. Therefore, the agro-industrial liquid residue generated in the distillation step from wine for pisco elaboration in Chile can be to able an opportunity for the valorization of this waste as biofilms or coatings.