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The Effect of Polymer/ Plasticiser Ratio in Film Forming Solutions on the Properties of Chitosan Films

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Abstract

In this work physical-chemical properties of chitosan/ glycerol film forming solutions (FFS) and the resulting films were analysed. Solutions were prepared using different concentrations of plasticising agent (glycerol) and chitosan. Films were produced by solvent casting and equilibrated in a controlled atmosphere. FFS water activity and rheological behaviour were determined. Films water content, solubility, water vapour and oxygen permeabilities, thickness, and mechanical and thermal properties were determined. Fourier transform infrared (FTIR) spectroscopy was also used to study the chitosan/glycerol interactions.

Results demonstrate that FFS chitosan concentration influenced solutions consistency coefficient and this was related with differences in films water retention and structure. Plasticiser addition led to an increase in films moisture content, solubility and water vapour permeability, water affinity and structural changes. Films thermo-mechanical properties are significantly affected by both chitosan and glycerol addition. FTIR experiments confirm these results.

This work highlights the importance of glycerol and water plasticisation in films properties.

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Abbreviations

A :

area (m2)

aw :

water activity

EB:

elongation at break (%)

K :

consistency coefficient (Pa sn)

MC:

moisture content (%)

n :

flow index (dimensionless)

O2P:

oxygen permeability (g/m s Pa)

SOL:

solubility in water (%)

t:

time (s)

T g :

glass transition temperature (°C)

T m :

melting temperature (°C)

TS:

tensile strength (MPa)

w :

weight loss (g)

WVP:

water vapour permeability (g/m s Pa)

x :

thickness (mm)

∆h :

melting enthalpy (J/g)

∆P :

difference of partial vapour pressure (Pa)

σ :

shear stress (Pa)

\( \dot{\gamma} \) :

shear rate (1/s)

A.U.:

arbitrary units

Chit:

chitosan

FFS:

film forming solutions

Gly:

glycerol

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Acknowledgments

This work was supported by National Funds from FCT – Fundação para a Ciência e a Tecnologia, through project PEst-OE/EQB/LA0016/2011.

Authors Joana F. Fundo, Andrea C. Galvis-Sánchez and Mafalda A. C. Quintas acknowledge FCT for research grants SFRH/ BD / 62176 / 2009, SFRH/BPD/37890/2007 and SFRH / BPD / 41715 / 2007, respectively.

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Authors and Affiliations

  1. CBQF - Centro de Biotecnologia e Química Fina – Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa/Porto, Rua Arquiteto Lobão Vital, Apartado 2511, 4202-401, Porto, Portugal

    Joana F. Fundo, Andrea C. Galvis-Sanchez, Cristina L. M. Silva & Mafalda A. C. Quintas

  2. Departamento de Química, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193, Aveiro, Portugal

    Andrea C. Galvis-Sanchez & Ivonne Delgadillo

  3. IBB – Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Braga, Portugal

    Mafalda A. C. Quintas

Authors
  1. Joana F. Fundo
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  2. Andrea C. Galvis-Sanchez
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  3. Ivonne Delgadillo
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  4. Cristina L. M. Silva
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  5. Mafalda A. C. Quintas
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Corresponding author

Correspondence to Cristina L. M. Silva.

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Fundo, J.F., Galvis-Sanchez, A.C., Delgadillo, I. et al. The Effect of Polymer/ Plasticiser Ratio in Film Forming Solutions on the Properties of Chitosan Films. Food Biophysics 10, 324–333 (2015). https://doi.org/10.1007/s11483-015-9394-3

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  • DOI: https://doi.org/10.1007/s11483-015-9394-3

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