Desarrollo de películas de almidón de maíz modificado por acetilación y plastificante mediante método de casting

Abstract

Native corn starch has a considerable amount of amylose; this molecule influences the gelatinization properties, it can retrograde, produce gel and form films. The starch modified by acetylation is considered an alternative to improve the physical properties of the films. The purpose of this work is to develop films based on corn starch modified by acetylation and plasticizer by casting method. Where, native corn starch (commercial cornstarch) was modified at different reaction conditions of which time was a variable (30 and 60 minutes) and the volume of 10 mL of AA was considered constant; to maintain the basic nature of the reaction, 0.5N sodium hydroxide solution was applied. It was evidenced that the percentage of acetyl and degree of substitution indicated statistically significant differences (p<0.05) with respect to the reaction time; determining that the greater the reaction time, the values of said variables increase. For native and acetylated starch, analyzes of the chemical and functional properties were made in order to analyze the effect of the acetylation process on said properties; regarding the chemical properties, the percentage of: moisture, fat, protein, fiber, ash and carbohydrate are taken into account, of which the influence of the acetylation process on these parameters was recorded (p<0.05); except for the protein percentage (p>0.05).