Instituto Politécnico Nacional, Centro De Investigación En Ciencia Aplicada y Tecnología Avanzada, Cerro Blanco No. 141, Col. Colinas Del Cimatario, C.P. 76090, Santiago De Querétaro, Querétaro, Mexico; Centro De Investigación En Química Aplicada, Blvd. Enrique Reyna No. 140, C.P. 25253, Saltillo, Coahuila, Mexico.
Instituto Politécnico Nacional, Centro De Investigación En Ciencia Aplicada y Tecnología Avanzada, Cerro Blanco No. 141, Col. Colinas Del Cimatario, C.P. 76090, Santiago De Querétaro, Querétaro, Mexico.
Carbohydr Polym. 2020 Jun 1;237:116103. doi: 10.1016/j.carbpol.2020.116103. Epub 2020 Mar 5.
In this study, the chemical, mechanical and barrier properties of films made from plasma-modified corn starch (MSF) were evaluated as a function of the amylose content (30, 50 and 70 %). SEM analysis revealed the presence of remnant starch granules (RSG) in all films, which promoted the ordering of helices as suggested by the FTIR results. Moreover, XPS analysis was used to identify the oxidation mechanism in all MSF as the atomic proportion of hydroxyl, carbonyl and carboxyl groups changed. Also, the increase of C-C proportions suggested crosslinking in MSF70. TGA analysis indicated low interaction between starch and the plasticizer as the tensile strength and elongation at break diminished in MSF50 and MSF70 due to the low plasticizing effect of glycerol, the oxidation phenomena and the depolymerization of starch chains. However, the crosslinking of MSF70 showed characteristics of rigid films with good hydrophobic performance.
本研究评估了等离子体改性玉米淀粉（MSF）薄膜的化学、机械和阻隔性能，作为直链淀粉含量（30、50 和 70%）的函数。SEM 分析表明，所有薄膜中都存在残留淀粉颗粒（RSG），这促进了螺旋的有序排列，正如 FTIR 结果所表明的那样。此外，XPS 分析用于确定所有 MSF 中的氧化机制，因为羟基、羰基和羧基基团的原子比例发生了变化。同样，C-C 比例的增加表明 MSF70 中存在交联。TGA 分析表明，淀粉与增塑剂之间的相互作用较低，因为由于甘油的塑化效果低、氧化现象和淀粉链的解聚，MSF50 和 MSF70 的拉伸强度和断裂伸长率降低。然而，MSF70 的交联表现出刚性薄膜的特性，具有良好的疏水性。
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