Adsorption and desorption of eggplant peel anthocyanins on a synthetic layered silicate. (December 2019)

• Record Type: Journal Article
• Authors: Capello, Cristiane; Leandro, Gabriel Coelho; Maduro Campos, Carlos Eduardo; Hotza, Dachamir; Mattar Carciofi, Bruno Augusto; Valencia, Germán Ayala
• Is Part Of: Journal of food engineering. Volume 262(2019)
• Page Start: 162
• Page End: 169
• Publication Date: 2019-12
• Subjects: Eggplant residue -- Food pigment -- Food residue valorization -- Natural pigments -- Layered silicates; Food industry and trade -- Periodicals; Food -- Analysis -- Periodicals; Aliments -- Industrie et commerce -- Périodiques; Aliments -- Analyse -- Périodiques; Aliments -- Recherche -- Périodiques; 664.005
• DOI: 10.1016/j.jfoodeng.2019.06.010
• Languages: English
• ISSNs: 0260-8774

Abstract

Abstract: This work reports for the first-time the adsorption of anthocyanins (ACN) on the surface of laponite® (Lap), as well the physicochemical characterization of ACN-Lap powders after the adsorption process. ACN were extracted from eggplant peel by using an acidified water solution. The adsorption/desorption tests were carried out at different temperature and pH values. The best adsorption conditions were at 20 °C and pH 1.0. The adsorption mechanism of ACN on Lap was better explained by Langmuir and pseudo-first-order kinetic models, therefore, the ACN adsorption on Lap can be classified as monolayer adsorption, influenced by physical interactions. Lap has a high ratio of adsorption/desorption. After adsorption, the ACN-Lap powder presents an amorphous structure with a purple color, which changes with pH modification. Lap can be used to valorize food residues rich in ACN such as eggplant peel. The ACN-Lap powder has potential application as dye or pigment in the food industry. Highlights: Laponite can be used for separating anthocyanins. Laponite had good adsorption/desorption capacities of anthocyanins. Langmuir and pseudo-first-order kinetic models described adequately the adsorption process. Anthocyanin-laponite powder can be used as pH sensing.