Water cast film formability of sugarcane bagasse xylans favored by side groups
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ORIGINAL RESEARCH
Water cast film formability of sugarcane bagasse xylans favored by side groups Zhouyang Xiang . Xuchen Jin . Caoxing Huang . Lian Li . Wanhua Wu . Haisong Qi . Yoshiharu Nishiyama
Received: 19 March 2020 / Accepted: 12 June 2020 Ó Springer Nature B.V. 2020
Abstract Hemicellulose, one of the most abundant biopolymers next to cellulose, has been considered as a potential substitute to synthetic polymers. Film casting from water is the most basic route for material applications of xylan. However, depending on plant sources and separation methods, xylans do not always form films and the related mechanism is unclear, which significantly hinders their material applications. We extensively characterized various fractions of bagasse xylan to understand the molecular features promoting the film formation. The side groups of xylans or impurities contributed to the prevention of excessive aggregation or crystallization of xylan molecules, leading to the film-forming capacity.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03291-7) contains supplementary material, which is available to authorized users. Z. Xiang (&) X. Jin L. Li W. Wu H. Qi State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China e-mail: [email protected] C. Huang Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China Y. Nishiyama Univ. Grenoble Alpes, CNRS, CERMAV, Grenoble 38000, France
However, once the film is formed, the side groups do not seem to be necessarily contributing to the mechanical resistance. Keywords Xylan Crystallization Side group Film formation Mechanical property
Introduction Polysaccharides in plant secondary cell walls are the most abundant renewable biopolymers on Earth, among which hemicelluloses are the second most abundant after cellulose (Huang et al. 2019a; Lin et al. 2019). Hemicelluloses are a group of hetero-polysaccharides with highly diversified structures incorporating various sugars. Hemicelluloses extracted from hardwood and graminaceous plants are primarily xylans, which is relatively easy to be separated and processed compared to other types of hemicellulose such as glucomannans from softwood. Generally, xylans have b-(1-4)-linked D-xylopyranosyl backbone but are heavily substituted in native state with substituents mainly including a-L-arabinofuranosyl, a-D-glucuronopyranosyl units or/and 4-O-methyl-a-Dglucuronopyranosyl units; most xylans are partially acetylated (Ebringerova and Heinze 2000; Morais de Carvalho et al. 2017; Spiridon and Popa 2008; Sun et al. 2000). From different plant sources, the chemical structure of xylans also varies. In hardwood, xylans do
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Cellulose
not have arabinofuranosyl substitutions, which are specifically termed as glucuronoxylans. The xylans from woody tissues of grasses and annual plants are s
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