Characterization of Functional Properties of Biodegradable Films Based on Starches from Different Botanical Sources,Starch

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Characterization of Functional Properties of Biodegradable Films Based on Starches from Different Botanical Sources
Starch ( IF 2.6 ) Pub Date : 2020-04-20 , DOI: 10.1002/star.201900282
Carlos Alberto Gómez‐Aldapa ₁ , Gonzalo Velazquez ₂ , Miguel C. Gutierrez ₃ , Javier Castro‐Rosas ₁ , Enrique Javier Jiménez‐Regalado ₄ , Rocio Yaneli Aguirre‐Loredo _{1,

5}

Affiliation

Starch is the main biopolymer used to develop biodegradable films and coatings, mainly due to its availability in nature and low cost. Therefore, it is important to determine the properties of starch‐based packaging materials, since the characteristics of each material may differ according to the botanical source. In this study, the functional properties of biodegradable films made from starch isolated from four botanical sources, corn, sorghum, potato, and achira are evaluated. The mechanical, water vapor barrier, morphological, thermal, and hydration properties are studied. Obtained films have a homogeneous appearance with no pores or cracks. The potato and achira films present some non‐gelatinized granules on their surface, however, they are the ones that present the highest mechanical properties, where the non‐gelatinized granules function as a reinforcing material for the polymer matrix. The red sorghum starch films present the best barrier for water vapor. The source of starch shows a significant effect on the tensile strength (TS) and percentage of elongation at breaking (%E). The solubility, swelling index, and water vapor adsorption capacity change significantly when comparing the four botanical sources, mainly because of the differences in the morphology of the resulting materials, amylose content and the size of the starch granule.

中文翻译：

基于不同植物来源淀粉的可生物降解薄膜的功能特性表征

淀粉是用于开发可生物降解的薄膜和涂料的主要生物聚合物，这主要是由于其天然的可用性和低成本。因此，确定淀粉基包装材料的特性非常重要，因为每种材料的特性可能会根据植物来源而有所不同。在这项研究中，评估了由从四种植物来源（玉米，高粱，马铃薯和小龙虾）中分离的淀粉制成的可生物降解薄膜的功能特性。研究了机械，水蒸气阻隔，形态，热和水合性能。获得的膜具有均匀的外观，没有孔或裂纹。马铃薯和阿奇拉膜在其表面呈现出一些未糊化的颗粒，但是它们却具有最高的机械性能，非糊化颗粒可作为聚合物基质的增强材料。红色高粱淀粉薄膜是水蒸气的最佳屏障。淀粉来源对拉伸强度（TS）和断裂伸长率（％E）表现出显着影响。比较这四种植物来源时，溶解度，溶胀指数和水蒸气吸附能力发生了显着变化，这主要是由于所得材料的形态，直链淀粉含量和淀粉颗粒大小的差异。

更新日期：2020-04-20

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