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Open AccessArticle

Active Biopolymer Coating Based on Sodium Caseinate: Physical Characterization and Antioxidant Activity

1
Department of Agricultural Science, Via Università 133, 80055 Portici (NA), Italy
2
Centre of Food innovation and Development in the Food Industry, Via Università 100, 80055 Portici (NA), Italy
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(8), 706; https://doi.org/10.3390/coatings10080706
Received: 4 June 2020 / Revised: 16 July 2020 / Accepted: 19 July 2020 / Published: 22 July 2020
(This article belongs to the Special Issue Bio-Based Active Packaging for Shelf Life Extension)
The objective of this work was to investigate the effect of sodium caseinate concentration on physical-chemical properties of coating solutions and films obtained by casting as a starting point for the development of an active coating for minimally processed fruits or vegetables. Sodium caseinate solutions at different concentrations (4%, 8%, 10%, 12%, 14%) were used as a coating system. The coating viscosity and desorption kinetic were characterized. Minimally processed fennels were coated by dipping and the liquid and dry coating thickness were estimated by assessing the amount of coating on fennel during draining as a function of solution properties (concentration and viscosity). Film obtained by casting were also characterized in terms of equilibrium moisture content, color, and water vapor permeability. The potential of using the sodium caseinate solution to obtain active coating was investigated by adding gallic acid or rosemary oil to sodium caseinate solution at 4%. The antioxidant capacity of the coating was evaluated by DPPH test. Results show that sodium caseinate solutions follow a Newtonian behavior in the range of concentration investigated and the viscosity increased as solids concentration increased, following a power law. The drying rate was in the range 0.0063–0.00107 mgH2O·mgsolids−1·min−1·m−2 as a function of sodium caseinate concentration. The average liquid and dry coating thickness on fennels were in the range 20–70 and 0.7–6.4 μm, respectively. The water vapor permeability slightly decreased as the solid concentration increased. Active coating showed good antioxidant properties. View Full-Text
Keywords: viscosity; desorption kinetic; coating thickness; gallic acid; rosemary oil; water vapor permeability viscosity; desorption kinetic; coating thickness; gallic acid; rosemary oil; water vapor permeability
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MDPI and ACS Style

Valentino, M.; Volpe, S.; Di Giuseppe, F.A.; Cavella, S.; Torrieri, E. Active Biopolymer Coating Based on Sodium Caseinate: Physical Characterization and Antioxidant Activity. Coatings 2020, 10, 706. https://doi.org/10.3390/coatings10080706

AMA Style

Valentino M, Volpe S, Di Giuseppe FA, Cavella S, Torrieri E. Active Biopolymer Coating Based on Sodium Caseinate: Physical Characterization and Antioxidant Activity. Coatings. 2020; 10(8):706. https://doi.org/10.3390/coatings10080706

Chicago/Turabian Style

Valentino, Marika; Volpe, Stefania; Di Giuseppe, Fabio A.; Cavella, Silvana; Torrieri, Elena. 2020. "Active Biopolymer Coating Based on Sodium Caseinate: Physical Characterization and Antioxidant Activity" Coatings 10, no. 8: 706. https://doi.org/10.3390/coatings10080706

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