Plasticizing effect of babassu oil (Attalea speciosa) on starch-based biodegradable film
DOI:
https://doi.org/10.14808/sci.plena.2023.121502Keywords:
polymeric film, X-ray diffractometry, thermal analysisAbstract
Edible packaging and/or coatings made from renewable sources are an alternative for increasing the shelf life of food. Starch is a substance that can be plasticized by combining it with different low molecular mass organic compounds used to coat food. These compounds, known as plasticizers, act by breaking hydrogen bonds, increasing the volume of the material. This results in greater mobility of the starch chains and a change in the glass transition temperature (Tg). Four different formulations of a polymeric film were made from an aqueous solution composed of 5% babassu starch, babassu oil and sorbitol. These materials were characterized by X-ray diffractometry (XRD), simultaneous thermogravimetry and differential thermal analysis (TG-DTA) and differential scanning calorimetry (DSC). The diffractograms of the film formulations showed shifts and rounding of the peaks and a decrease in crystallinity as the concentration of oil in the medium increased. The thermal stability of the film formulations studied was good. The increase in Tg indicated an increase in the stability of the amorphous state of the samples, verifying the plasticizing effect of the babassu oil. Thus, this increase is related to a wider temperature range of stability in the glassy state. Therefore, due to their visual and thermal characteristics, the FT1 and FT2 formulations are more suitable for application on food surfaces such as fresh fruit, with the aim of maintaining the organoleptic properties and increasing the shelf life of food.
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Copyright (c) 2024 Luís Henrique Silva Queiroz, Paulo Roberto da Silva Ribeiro, Ana Lúcia Fernandes Pereira, Virginia Kelly Gonçalves Abreu
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