Rheology of Film-Forming Solutions and Physical Properties of Differently Deacetylated Salep Glucomannan Film

Abstract

The aim of this work was to evaluate the influence of deacetylation degrees (DD, 0-50-100%) and concentrations of glycerol (G, 0-5-10%) on the film solution rheology and physical properties of salep glucomannan film. Solution rheology experiments demonstrated that the deacetylation can be used as a tool to regulate film solution flow, its spread and also coating applications. Deacetylated salep films were produced with and without glycerol. The non-plasticized film was obtained with no cracks and bubbles. The deacetylation of purified glucomannan with the aid of glycerol significantly changed the physical properties of the film by increasing its density, opacity whereas light transmittance and moisture content were decreased due to the formation of associations between acetyl free regions of the glucomannan chains. Overall, 100% DD films with 10% glycerol demonstrated better physical characteristics. Findings suggest that deacetylation is promising chemically modification method for the production of food packaging materials.

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