Simultaneous influence of pectin and xyloglucan on structure and mechanical properties of bacterial cellulose composites. (15th October 2017)

• Record Type: Journal Article
• Authors: Szymańska-Chargot, Monika; Chylińska, Monika; Cybulska, Justyna; Kozioł, Arkadiusz; Pieczywek, Piotr M.; Zdunek, Artur
• Is Part Of: Carbohydrate polymers. Volume 174(2017)
• Page Start: 970
• Page End: 979
• Publication Date: 2017-10-15
• Subjects: Bacterial cellulose -- Pectins -- Xyloglucan -- AFM -- Cellulose crystallinity -- Mechanical properties; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2017.07.004
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: The bacterial cellulose composites were prepared with pectin and xyloglucan addition. The amount of non-cellulosic additive varied among composites. The mutual influence of pectin and xyloglucan on their bonding capacity in composites. The bigger the ratio of xyloglucan to pectin the microfibrils are thicker. The lower the ratio of xyloglucan to pectin the higher is Young's modulus of BC composite. Abstract: The impact of the matrix polysaccharides on the cellulose microfibrils structure as well as on the mechanical properties of cell walls still remains an open question. Therefore, the aim of investigations was to determine the simultaneous influence of (i) different concentrations of pectins with constant concentration of xyloglucan, and (ii) different concentrations of xyloglucan with constant concentration of pectins on cellulose structure. Composites of bacterial cellulose (BC) produced by Komagataeibacter xylinus are considered to mimic natural plant cell walls. This investigation showed that the lower the ratio of xyloglucan to pectin was, the higher Young's modulus of BC composite was and also obtained cellulose microfibrils were thinner. The increasing concentration of xyloglucan to pectin also caused the drop down in microfibrils crystallinity degree with predominant structure of cellulose Iβ . In that case, also the length of cellulose chains was growing and reaching the highest value among all BC composites.