Thermodynamic analysis as a useful tool to study the physical properties of sweet‐potato starch films reinforced with alginate microparticles

Thermodynamic analysis as a useful tool to study the physical properties of sweet‐potato starch films reinforced with alginate microparticles

Thermodynamic analysis is a useful instrument for understanding the state of adsorbed water molecules and their influence on the physical and chemical stability of packaging materials during their functioning. This study assesses the effect of alginate microparticles as reinforcement on the water‐ad...

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Bibliographic Details
Published in:Polymer composites Vol. 42; no. 7; pp. 3380 - 3390
Main Authors: Acosta‐Domínguez, Laura, Salazar, Ricardo, Jiménez, Maribel, Azuara, Ebner
Format: Journal Article
Language:English
Published: Hoboken, USA John Wiley & Sons, Inc 01-07-2021
Blackwell Publishing Ltd
Subjects:
Adsorption
alginate microparticles
Alginates
antiplasticization effect
Biopolymers
Criteria
Entropy
glycerol
integral entropy
Integrals
Microparticles
Photomicrographs
Physical properties
Potatoes
Stability analysis
sweet‐potato starch
Water activity
water adsorption
Water chemistry
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Summary:Thermodynamic analysis is a useful instrument for understanding the state of adsorbed water molecules and their influence on the physical and chemical stability of packaging materials during their functioning. This study assesses the effect of alginate microparticles as reinforcement on the water‐adsorption characteristics and physical properties of sweet‐potato starch biopolymer films. Glycerol was utilized as plasticizer. Then, physical stability was evaluated through minimum integral entropy criteria. The incorporation of alginate microparticles significantly decreased (p < 0.05) spin–lattice relaxation times, water‐vapor permeability, and the films' water solubility. Additionally, the adsorption capacity, as well as the physical stability of the films, were increased from 0.38 to 0.63 water activity at 25°C. An antiplasticization effect of water was noted in the water‐activity range, where the adsorption process was entropy‐controlled. Maximal resistance to breakage was enhanced in the minimum integral‐entropy zone. SEM micrographs revealed a rougher surface of reinforced films. Therefore, it is feasible to anticipate the most appropriate water activity where best film performance is achieved, employing minimum integral‐entropy criteria.
Bibliography:Funding information
Universidad Veracruzana (UV); Consejo Nacional de Ciencia y Tecnología(CONACYT)
ISSN:0272-8397
1548-0569
DOI:10.1002/pc.26065