Characterization of Semi-refined Carrageenan-Based Film for Primary Food Packaging Purposes

Carrageenan-based films demonstrate good performance, the raw materials for their production are abundant in nature and can be sustainably sourced from seaweeds. Similar to other naturally-derived biopolymers, however, carrageenans are relatively expensive to purify and form into useful materials. In order to potentially lower the production costs compared to pure carrageenan, semi-refined carrageenan (SRC) plasticized with 0–50% (w/w) glycerol was investigated using a solution casting method. The film color and opacity increased along with the moisture content, whereas the water vapor permeability decreased with increasing levels of glycerol. The tensile properties of the SRC films improved significantly, particularly at glycerol additions greater than 30% (w/w). Moreover, the addition of glycerol improved the thermal stability and altered the surface morphology of the films. In general, the properties of the SRC films were comparable with refined carrageenan films suggesting that SRC has potential to be furthered developed into more cost effective primary food packaging materials.