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<p>This study aimed to characterize a white sorghum starch (WSS) and evaluate the effects of varying starch concentrations and drying temperatures of the film-forming solution on the mechanical, thermal, barrier, and biodegradability properties of films produced via the casting method. The WSS exhibited an amylose content of 28.7% and a uniform distribution of porous granules. The swelling power and water solubility index values increased with rising temperatures (<i>p</i> &lt; 0.05). Thermogravimetric analysis revealed that the evaluated starch began gelatinization at approximately 73&#xa0;°C and demonstrated thermal stability up to 300&#xa0;°C, suggesting its potential application in packaging materials requiring high-temperature resistance. Fourier transform infrared spectroscopy identified hydroxyl and carbonyl functional groups, with peaks characteristic of starch samples. An increase in starch concentration resulted in greater thickness, grammage, water vapor permeability, tensile strength, and puncture resistance of the films. Additionally, drying temperature influenced the solubility of the materials, with the film formulated with 5% WSS and dried at 30&#xa0;°C exhibiting the highest solubility. All films achieved 100% disintegration in soil after 15 days and exhibited similar colors. Unlike previous studies mainly focused on other sorghum genotypes and modified starches, this study emphasizes the use of native white sorghum starch as a low-cost, widely available, and viable alternative for producing films with reproducible processing conditions. In summary, the optimal conditions (4% starch concentration and 30&#xa0;°C drying temperature) resulted in a balanced performance, ensuring suitable properties. Therefore, WSS stands out as a promising material for the development of biodegradable films.</p>

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Harnessing white sorghum starch for the production of biodegradable films: influence of starch concentration and drying temperature

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Vinícius Tadeu da Veiga Correia,
  • Pãmella Fronza,
  • Nayana Hayss Araújo da Silva,
  • Ana Luiza Santos Vieira,
  • Isabella Maciel Costa,
  • Layla Talita Oliveira Alves,
  • Ana Luiza Mendes Nunes da Silva,
  • Washington Azevêdo da Silva,
  • Valéria Aparecida Vieira Queiroz,
  • Julio Onesio-Ferreira Melo,
  • Camila Argenta Fante

摘要

This study aimed to characterize a white sorghum starch (WSS) and evaluate the effects of varying starch concentrations and drying temperatures of the film-forming solution on the mechanical, thermal, barrier, and biodegradability properties of films produced via the casting method. The WSS exhibited an amylose content of 28.7% and a uniform distribution of porous granules. The swelling power and water solubility index values increased with rising temperatures (p < 0.05). Thermogravimetric analysis revealed that the evaluated starch began gelatinization at approximately 73 °C and demonstrated thermal stability up to 300 °C, suggesting its potential application in packaging materials requiring high-temperature resistance. Fourier transform infrared spectroscopy identified hydroxyl and carbonyl functional groups, with peaks characteristic of starch samples. An increase in starch concentration resulted in greater thickness, grammage, water vapor permeability, tensile strength, and puncture resistance of the films. Additionally, drying temperature influenced the solubility of the materials, with the film formulated with 5% WSS and dried at 30 °C exhibiting the highest solubility. All films achieved 100% disintegration in soil after 15 days and exhibited similar colors. Unlike previous studies mainly focused on other sorghum genotypes and modified starches, this study emphasizes the use of native white sorghum starch as a low-cost, widely available, and viable alternative for producing films with reproducible processing conditions. In summary, the optimal conditions (4% starch concentration and 30 °C drying temperature) resulted in a balanced performance, ensuring suitable properties. Therefore, WSS stands out as a promising material for the development of biodegradable films.