Microencapsulation of Anthocyanins with Different Wall Materials and Its Application in Active Biodegradable Films

Wine grape pomace, a by-product known for its high polyphenolic content, was used as a source of anthocyanins in the acquisition of active biodegradable films, which were produced with anthocyanins encapsulated with different wall materials endowed with film-forming properties. Gum arabic and maltodextrin were used in different proportions during the encapsulation process, and the anthocyanin contents of the powders obtained were quantified by high-efficiency liquid chromatography (HPLC), resulting in up to 91.5 % retention. The antioxidant properties, solubility, and color stability of powders were analyzed. Because the microcapsules were added in the highest proportion, it was considered the major component in the formation of films. Microcapsules produced with gum arabic showed higher antioxidant activity as compared to microcapsules produced with maltodextrin. Nevertheless, based on a comparison of the films obtained in this study, the films made with anthocyanins encapsulated with maltodextrin showed better mechanical properties and higher protective effect on oil oxidation, which makes maltodextrin a promising material enabling the formation of films with satisfactory mechanical properties endowed with anthocyanins.