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BP: Fachverband Biologische Physik
BP 20: Poster VIII
BP 20.23: Poster
Dienstag, 17. März 2020, 14:00–16:00, P2/4OG
XPS evaluation of enzymatically oxidized nanocellulose from tunicate biomass — •Philipp Moritz1,2, Oliver Höfft1, Anthi Karnaouri3, Paul Christakopoulos3, Ulrika Rova3, Georgia Sourkouni2, and Wolfgang Maus-Friedrichs1,2 — 1Institute of Energy Research and Physical Technologies, Clausthal University of Technology, 38678 Clausthal-Zellerfeld — 2Clausthal Centre of Material Technology, Clausthal University of Technology, 38678 Clausthal-Zellerfeld — 3Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 97187 Luleå
The use of highly crystalline oxidized nanocellulose has recently increased considerably, particularly in biomedicine. The exact physicochemical and mechanical properties of cellulose nanocrystals depend primarily on their origin and the manufacturing process.
The aim of our experiments is to obtain highly crystalline and oxidized nanocellulose from the invertebrate tunicate species Ciona intestinalis. A novel process consisting of an organosolv pre-treatment and a subsequent enzyme treatment was developed for this purpose. The biocatalyst lytic polysaccharide monooxygenase (LPMO) is known to oxidatively cleave the glycosidic bond of cellulose without reducing its crystallinity. To evaluate the oxidizing effect of the novel pre-treatments, X-ray photoelectron spectroscopy (XPS) was used.
Compared to the untreated raw nanocellulose, XPS indicates a significant increase of the oxidized "C=O/O-C-O" and "O-C=O" species achieved by the novel physicochemical pre-treatment. An additional in-situ enzyme treatment leads to further oxidation of the material.