The Effect of Glycerol as a Plasticizer in Modified Corn Starch Films

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Keywords :

starch, acetylation, films, physical properties

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Abstract

In this research, the effect of glycerol as a plasticizer in the production of biodegradable films based on modified commercial corn starch by acetylation is determined. Starches were modified with reaction times ranging from 30 to 60 minutes, while keeping the volume of acetic anhydride as the modifying agent and the reaction temperature constant. It was observed that the modification significantly affected the composition in terms of carbohydrates, ash, moisture, and fibers (p<0.05), while it had a lesser impact on proteins (p>0.05). Significant differences (p<0.05) in functional properties were observed among the starches. Through thermogravimetric analysis, it was verified that native starch had a greater weight loss compared to acetylated starches with different reaction times. Starch with a high degree of substitution (DS = 0.021) was used in the production of films through the casting method, employing a 23 factorial experimental design with modified starch concentrations of 2%, 4%, and 6% w/v and glycerol concentrations of 1%, 3%, and 5% w/v. The results of the response variables (% Solubility and % Moisture) were interpreted through ANOVA statistical analysis. It was observed in the Pareto chart and response surface plot that a higher percentage of glycerol leads to an increase in the interaction with modified corn starch (p<0.05), whereas the concentration of modified corn starch had the opposite effect (p<0.05). The regression models for % Moisture and % Solubility yielded adjusted R-squared values of 97.1201% and 95.7232%, respectively, meeting the necessary conditions for ensuring optimal product production.

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Published

2023-10-04
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How to Cite

The Effect of Glycerol as a Plasticizer in Modified Corn Starch Films. (2023). Journal of Science and Research: Revista Ciencia E Investigación, 8(4), 186-204. https://revistas.utb.edu.ec/index.php/sr/article/view/2966

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Artículo de Investigación