In this study, the effect of the addition of citric acid (CA) and whey protein isolate (WPI) on film properties of the starch extracted from the achira rhizome (Canna indica L.) was evaluated. For this purpose, starch films were prepared by solvent casting with different CA and WPI concentrations. Starch granules were fully characterized and the chemical and thermal behavior of the obtained starch films were also studied. The retrogradation phenomenon was analyzed in films from 1 week to 1 year of preparation. Maximum tensile strength (_max) and maximum elongation at break (_max), as well as water vapor permeability, were measured for all films. It was found that both molecules, CA and WPI, show a plasticizing effect on starch films, favoring the formation of a more uniform and resistant material by means of hydrogen bonding. A partial crosslinking between CA and starch was found by Fourier transform infrared, which is coherent with a higher degradation temperature peak found by thermogravimetric analysis. It was also observed that starch retrogradation was affected by the presence of both molecules, CA and WPI. The highest _max (5.7 ± 0.1 N/mm²) and _max (35%) values were achieved at the eighth weeks when both CA (6%) and WPI (11%) were used. Addition of CA and WPI did not show a significant difference in permeability values of starch films (1.40 × 10⁻⁹ ± 0.10 g/m s Pa).

在这项研究中，评估了添加柠檬酸（CA）和乳清蛋白分离物（WPI）对从on茎根茎（Canna indica L.）提取的淀粉的膜性能的影响。为此，通过溶剂流延以不同的CA和WPI浓度制备淀粉膜。对淀粉颗粒进行了充分表征，并对所得淀粉薄膜的化学和热行为进行了研究。从制备的1周到1年，分析了胶片中的回生现象。最大抗张强度（_max）和最大断裂伸长率（_max对所有膜都测量了）和水蒸气渗透率。已经发现，CA和WPI这两种分子均对淀粉膜显示出增塑作用，从而有利于通过氢键形成更均匀和更耐久的材料。通过傅立叶变换红外光谱发现，CA和淀粉之间发生了部分交联，这与通过热重分析发现的更高的降解温度峰一致。还观察到淀粉回生受CA和WPI两种分子的存在影响。最高_最大值（5.7±0.1 N / mm ²）和_最大值当同时使用CA（6％）和WPI（11％）时，在第八周达到（35％）值。添加CA和WPI并未显示淀粉膜的渗透率值有显着差异（1.40×10 ^-9  ±0.10 g / ms Pa）。