Abstract
Moisture sorption characteristic is important in determining the stability of bio-based plastic during packaging and storage condition. This study was carried out to investigate the moisture sorption characteristic of starch-based film. Moisture sorption test was conducted at different temperatures (5, 30 and 50°C) and relative humidity (23-75%). The experimental data was fitted using several models. Based on the Peleg model, the maximum rate of absorption and absorption capacity occurred at higher relative humidity. Guggenheim Anderson de Boer (GAB) model was the most suitable model to fit the experimental isotherm data and it is useful to predict the water sorption properties of the film which relate to different relative humidity conditions. In addition, the shelf life of film was reduced when placed under lower temperature due to the higher sorption capacity of moisture. The sorption properties of the starch-based film are important and worth investigation as it will be useful for the final application in food packaging due to its dependency on this behaviour.
Highlights
Low amount of moisture being adsorbed as time increased due to hydrophilic nature of the starch-based film which possessed high moisture sensitivity to absorb moisture from the surrounding (Chang et al, 2006; Basiak et al, 2017)
The water sorption test indicates that a higher equilibrium moisture content was required for the film which stored at higher relative humidity
Based on the Peleg model, the maximum rate of absorption and absorption capacity occurred at higher relative humidity
Summary
Bio-based plastic derived from various plant resources such as starch and protein have been regarded as alternative materials to petroleum plastic because they are abundant, renewable and biodegradable (Liu et al, 2005; Koronis et al, 2013; Iwata, 2015; Gadhave et al, 2018). Packaging made from bio-based materials could help reduce greenhouse effect gas (GHG) emissions. The keys to success for the development of bio-based plastic are the performance should be improved to a level which is comparable with conventional plastic and the production cost should be reduced. The moisture content can significantly affect the physical and barrier properties of starch-based films (Euaphantasate et al, 2008). It was a big challenge to the manufacturing industry and consumer to maintain the physical and mechanical properties of the starch-based film during packaging and storage condition. Understanding the relative importance of different mechanisms controlling moisture transfer through hygroscopic films is important to design films with improved and selective barrier properties (Galus and Lenart, 2013)
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