Dresden 2020 – scientific programme

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BP: Fachverband Biologische Physik

BP 20: Poster VIII

BP 20.23: Poster

Tuesday, March 17, 2020, 14:00–16:00, P2/4OG

XPS evaluation of enzymatically oxidized nanocellulose from tunicate biomass — •Philipp Moritz^1,2, Oliver Höfft¹, Anthi Karnaouri³, Paul Christakopoulos³, Ulrika Rova³, Georgia Sourkouni², and Wolfgang Maus-Friedrichs^1,2 — 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.