Gelatin-hydroxypropyl methylcellulose water-in-water emulsions as a new bio-based packaging material

Gelatin and hydroxypropyl methylcellulose (HPMC) are two incompatible and immiscible biopolymers which cannot form homogeneous composite films using usual methods. In this study, to prevent phase separation, gelatin-HPMC water-in-water (W/W) emulsion was utilized to from transparent composite films...

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Bibliographic Details
Published inInternational journal of biological macromolecules Vol. 86; pp. 242 - 249
Main Authors Esteghlal, Sara, Niakosari, Mehrdad, Hosseini, Seyed Mohammad Hashem, Mesbahi, Gholam Reza, Yousefi, Gholam Hossein
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.05.2016
Subjects
Emulsion-based film
Emulsions
Gelatin - chemistry
Hypromellose Derivatives - chemistry
Incompatibility
Mechanical Phenomena
Permeability
Product Packaging - methods
Solubility
Thermodynamics
Volatilization
Water - chemistry
Water-in-water emulsion
Incompatibility
Water-in-water emulsion
Emulsion-based film
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Summary:Gelatin and hydroxypropyl methylcellulose (HPMC) are two incompatible and immiscible biopolymers which cannot form homogeneous composite films using usual methods. In this study, to prevent phase separation, gelatin-HPMC water-in-water (W/W) emulsion was utilized to from transparent composite films by entrapment the HPMC dispersed droplets in gelatin continuous network. The physicochemical and mechanical properties of emulsion-based films containing different amounts (5–30%) of dispersed phase were determined and compared with those of individual polymer-based films. Incorporating HPMC into W/W emulsion-based films had no significant effect on the tensile strength. The flexibility of composite films decreased at HPMC concentrations below 20%. The depletion layer at the droplets interface reduced the diffusion of water vapor molecules because of its hydrophobic nature, so the water vapor permeability remained constant. Increasing the HPMC content in the emulsion films increased the swelling and decreased the transparency. The entrapment of HPMC in continuous gelatin phase decreased its solubility. Therefore, W/W emulsions are capable of holding two incompatible polymers alongside each other within a homogeneous film network without weakening the physical properties.
Bibliography:ObjectType-Article-1
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ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2016.01.065