Effect of Organic Acids as Additives on Buckwheat Starch Films Produced by Casting

The aim of this research is to investigate the influence of food‐grade organic acids incorporation in buckwheat starch films obtained by casting. Buckwheat starch is extracted via the alkaline methodology, and the impact of different acids and concentrations on film properties is evaluated. The films are submitted to the following characterizations: mechanical and moisture resistance properties, water vapor permeability (WVP), thermogravimetry (TG), field emission gun scanning electron microscopy (FEG‐SEM), and ATR‐FTIR (Attenuated Total Reflectance‐Fourier Transform Infrared) spectroscopy. Incorporating organic acids show film moisture reduction, WVP, and increased thermal stability. Among the organic acids tested, the films with tartaric and citric acids provide the most positive impact on the films’ mechanical and water resistance. In contrast, malic acid is demonstrated to have a less efficient crosslinking capacity.