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Investigation of the Internal Chemical Composition of Chitosan-Based LbL Films by Depth-Profiling X-ray Photoelectron Spectroscopy (XPS) Analysis
Langmuir ( IF 3.7 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acs.langmuir.7b04104 Thiago B. Taketa 1 , Danilo M. dos Santos 2 , Anderson Fiamingo 2 , Juliana M. Vaz 1 , Marisa M. Beppu 1 , Sérgio P. Campana-Filho 2 , Robert E. Cohen , Michael F. Rubner
Langmuir ( IF 3.7 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acs.langmuir.7b04104 Thiago B. Taketa 1 , Danilo M. dos Santos 2 , Anderson Fiamingo 2 , Juliana M. Vaz 1 , Marisa M. Beppu 1 , Sérgio P. Campana-Filho 2 , Robert E. Cohen , Michael F. Rubner
Affiliation
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Chitosan-based thin films were assembled using the layer-by-layer technique, and the axial composition was accessed using X-ray photoelectron spectroscopy with depth profiling. Chitosan (CHI) samples possessing different degrees of acetylation (
) and molecular weight (
) produced via the ultrasound-assisted deacetylation reaction were used in this study along with two different polyanions, namely, sodium polystyrenesulfonate (PSS) and carboxymethylcellulose (CMC). When chitosan, a positively charged polymer in aqueous acid medium, was combined with a strong polyanion (PSS), the total positive charge of chitosan, directly related to its 
, was the key factor affecting the film formation. However, for CMC/CHI films, the pH of the medium and 
of chitosan strongly affected the film structure and composition. Consequently, the structure and the axial composition of chitosan-based films can be finely adjusted by choosing the polyanion and defining the chitosan to be used according to its DA and 
for the desired application, as demonstrated by the antibacterial tests.
中文翻译：
深度谱X射线光电子能谱（XPS）分析研究壳聚糖基LbL膜的内部化学组成
使用逐层技术组装基于壳聚糖的薄膜，并使用具有深度轮廓的X射线光电子能谱访问轴向成分。通过超声辅助脱乙酰化反应产生的具有不同乙酰化度（）和分子量（）的壳聚糖（CHI）样品与两种不同的聚阴离子即聚苯乙烯磺酸钠（PSS）和羧甲基纤维素（CMC）一起用于本研究中。当壳聚糖（一种在酸性水介质中带正电荷的聚合物）与强聚阴离子（PSS）结合使用时，壳聚糖的总正电荷与其直接相关，是影响成膜的关键因素。但是，对于CMC / CHI膜，介质的pH值和壳聚糖的加入强烈影响了薄膜的结构和组成。因此，如抗菌测试所示，可以通过选择聚阴离子并根据其DA和所需应用定义要使用的壳聚糖，从而对壳聚糖基薄膜的结构和轴向组成进行微调。
更新日期：2018-01-19
) and molecular weight () produced via the ultrasound-assisted deacetylation reaction were used in this study along with two different polyanions, namely, sodium polystyrenesulfonate (PSS) and carboxymethylcellulose (CMC). When chitosan, a positively charged polymer in aqueous acid medium, was combined with a strong polyanion (PSS), the total positive charge of chitosan, directly related to its , was the key factor affecting the film formation. However, for CMC/CHI films, the pH of the medium and of chitosan strongly affected the film structure and composition. Consequently, the structure and the axial composition of chitosan-based films can be finely adjusted by choosing the polyanion and defining the chitosan to be used according to its DA and for the desired application, as demonstrated by the antibacterial tests.
中文翻译：
深度谱X射线光电子能谱（XPS）分析研究壳聚糖基LbL膜的内部化学组成
使用逐层技术组装基于壳聚糖的薄膜，并使用具有深度轮廓的X射线光电子能谱访问轴向成分。通过超声辅助脱乙酰化反应产生的具有不同乙酰化度（
）和分子量（）的壳聚糖（CHI）样品与两种不同的聚阴离子即聚苯乙烯磺酸钠（PSS）和羧甲基纤维素（CMC）一起用于本研究中。当壳聚糖（一种在酸性水介质中带正电荷的聚合物）与强聚阴离子（PSS）结合使用时，壳聚糖的总正电荷与其直接相关，是影响成膜的关键因素。但是，对于CMC / CHI膜，介质的pH值和壳聚糖的加入强烈影响了薄膜的结构和组成。因此，如抗菌测试所示，可以通过选择聚阴离子并根据其DA和所需应用定义要使用的壳聚糖，从而对壳聚糖基薄膜的结构和轴向组成进行微调。
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