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Mechanical and barrier properties of extruded film made from sodium and calcium caseinates

Paper ID Volume ID Publish Year Pages File Format Full-Text
19854 43136 2014 8 PDF Available
Title
Mechanical and barrier properties of extruded film made from sodium and calcium caseinates
Abstract

•The production of sodium and/or calcium caseinates films by twin-screw and blown-film extrusions was successful.•Films totally or partially based on calcium caseinate show better mechanical properties than those made from sodium caseinate only.•Calcium caseinate decreases the films water vapour permeability.•The presence of calcium ions in films based on caseinate slows down the water diffusion.

Over the past few years, much interest has been placed into the investigation of increased barrier and mechanical properties of protein films via a multitude of approaches. Generally, these techniques involve modifications of interactions among protein molecules, such as ionic crosslinking using divalent ions. To evaluate the crosslinking effect of Ca2+ cations, films were made from calcium caseinate (CaCAS) and/or sodium caseinate (NaCAS). The production of caseinate thin films was carried out in two steps: first thermoplastic pellets were made using a co-rotating twin-screw extruder, then they were transformed into thin films (60 μm) using a classical film blowing machine. Tensile measurements were carried out at 60% relative humidity (RH) and 30 °C using a homemade testing machine which allows the change in environmental conditions during the test. The films mechanical resistance was found to be affected by the presence of Ca2+ ions; films made from CaCAS were rigid and less flexible than those based on NaCAS only. Water vapour permeability (WVP) and water diffusion were also measured. The reported data showed that films with only CaCAS or in mixture with NaCAS are less permeable to water vapour than those totally made from NaCAS. Likewise, the calcium ions were found to slow down the water diffusion.Films based on CaCAS only or in mixture with NaCAS appear to be more attractive for food packaging, and their applications could be extended to other packaging area.

Keywords
Sodium caseinate; Calcium caseinate; Blown-film extrusion; Water permeability; Mechanical properties; Food packaging
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Mechanical and barrier properties of extruded film made from sodium and calcium caseinates
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food Packaging and Shelf Life - Volume 2, Issue 2, December 2014, Pages 65–72
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us