Aqueous carboxymethyl starch (CMS) compositions in the presence of medium chain fatty acids: caprylic and pelargonic and their rheology are studied during storage of up to two months. For comparison purposes, selected compositions based on slightly crosslinked CMS (cCMS) and carboxymethyl cellulose (CMC) are investigated. Substantial differences of neat CMS and CMC solution viscosity behavior versus systems based on carboxymethylated polysaccharides in the presence of fatty acids are found and discussed. Aqueous carboxymethylated polysaccharide/fatty acid systems are cast and films characterized by FTIR, moisture sorption degrees and transparency determination. Additionally, preliminary microbial tests for compositions are performed. CMS films with the presence of fatty acids exhibit a decrease in moisture sorption and transparency as compared to the reference CMS film. Paper disks covered with carboxymethylated polysaccharide‐based compositions show inhibited activity towards growth of Aspergillus flavus spores whereas coatings containing more than 10 pph fatty acid on polysaccharide exhibit antifungal properties against various spores (A. flavus, Aspergillus niger, Candida albicans).

中文翻译：

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羧甲基淀粉/中链脂肪酸组成：储存过程中的流变变化和选定的薄膜性能

在长达两个月的储存过程中，研究了中链脂肪酸：辛酸和壬酸存在下的羧甲基淀粉（CMS）水性组合物及其流变性。为了进行比较，研究了基于轻微交联的CMS（cCMS）和羧甲基纤维素（CMC）的选定组合物。发现并讨论了纯CMS和CMC溶液粘度行为与在脂肪酸存在下基于羧甲基化多糖的体系的显着差异。浇铸羧甲基化多糖/脂肪酸水溶液体系，并通过FTIR，水分吸收度和透明度测定表征薄膜。另外，对组合物进行了初步的微生物测试。与参考CMS膜相比，存在脂肪酸的CMS膜表现出的水分吸收和透明度降低。用羧甲基化多糖基组合物覆盖的纸盘显示出抑制其生长的活性黄曲霉孢子，而多糖上含有超过10 pph脂肪酸的涂层则表现出对各种孢子（黄曲霉，黑曲霉，白色念珠菌）的抗真菌特性。