In the present study cellulose isolated from CH (corn husk) and BR (banana rachis) was nanofibrillated by TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy)-mediated oxidation; followed by a mild homogenizing treatment with a magnetic stirrer. The monosaccharide composition of cellulose obtained from CH and BR was evaluated through UHPLC (ultra-high performance liquid chromatography). To verify the influence of the monosaccharide content of cellulose on the TEMPO-mediated oxidation, different reactions were performed, varying the time between 0 and 10 h.  TGA (thermogravimetrical analysis) and ATR-FTIR (attenuated total reflectance-Fourier transformed infrared spectroscopy) indicate the oxidation of the C6 hydroxyl groups of cellulose, obtaining sodium carboxylate groups, associated to a selective oxidation by TEMPO in both specimens. The oxidation degree (OD) and content of sodium carboxylate groups were different between CH and BR. The OD of BR increased with time in the studied interval, while CH reached a plateau at 5 h without an observable modification at higher times. The TGA of the samples indicates a decrease of the thermal stability of oxidized cellulose. Crystalline and compositional changes after TEMPO are being analyzed by X-RD (X-ray diffraction) and UHPLC. The oxidized cellulose will be characterized by AFM (atomic force microscopy) and TEM (transmission electron microscopy) to assess its morphology.

Influence of monosaccharide composition in TEMPO-mediated oxidation to produce cellulose nanofibrils from corn husk and banana rachis

253rd National Meeting (2017)

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