Carboxymethylcellulose from bleached organosolv fibers of Eucalyptus nitens: synthesis and physicochemical characterization
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The objective of the present study was to synthesize sodium carboxymethylcellulose from Eucalyptus nitens cellulose. The cellulose extraction was carried out in three stages. In the first stage, E. nitens wood was fractionated using an organosolv pretreatment (methanol–water 50% v/v, 45 min at 200 °C) followed by an alkaline extraction (NaOH, 1.5 M). Finally, the organosolv pulp was bleached using NaClO2 (1.3% w/v, pH 3.8). The bleached cellulose obtained was converted to sodium carboxymethylcellulose (NaCMC) by an etherification reaction in isopropanol medium. NaCMC structure, morphology and properties were researched using FTIR, 1H and 13C NMR spectroscopy, scanning electron microscopy, and thermogravimetric analysis. The results indicate substitution mostly occurred mostly at the C-6 position of 1 → 4 β-d-glucopyranosyl residues of cellulose chains.
KeywordsEucalyptus nitens Organosolv Cellulose Carboxymethylcellulose
The authors gratefully thank FONDECYT for financial support through Inserción de Capital Humano Avanzado en la academia Project No. 79100010, DICYT Asociativo (USACH) Project No. 021541YS, Proyecto DICYT 021642MD and Proyecto Basal Usach USA1398_MS002228.
- Chattopadhyay H, Sarkar PB (1946) A new method for the estimation of cellulose. Proc Natl Inst Sci India 12(1):23–46Google Scholar
- Fengel D, Wegener G (1989) Wood: chemistry, ultrastructure, reactions, 2nd edn. Walter de Gruyter, Berlin, pp 482–521Google Scholar
- Gysling AJ, Álvarez V, Soto DA, Pardo EJ, Toledo RR, Poblete PA, González PG, Bañados JC (2016) Chilean statistical yearbook of forestry. Statistical bulletin no. 154Google Scholar
- Kuckurek M (1989) Pulp and paper manufacture. 4. Tappi, Atlanta, pp 324–344Google Scholar
- Muurinen E (2000) Organosolv pulping—a review and distillation study related to peroxyacid pulping. Dissertation, University of Oulu, FinlandGoogle Scholar
- Pu Y, Hu F, Huang F, Davison BH, Ragauskas AJ (2013) Assessing the molecular structure basis for biomass recalcitrance during dilute acid and hydrothermal pretreatments. Biotechnol Biofuels 6(15):1–13Google Scholar
- Ruzene DS, Goncalves AR, Teixeira JA, Pessoa de Amorim MT (2007) Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions. Appl Biochem Biotechnol 573:136–140Google Scholar
- Sundquist J (2000) Organosolv pulping. In: Gullichsen J, Fogelbolm CJ (eds) Chemical Pulping, Papermaking Science and Technology Book 6B. Fapet Oy, Finland, pp 411–427Google Scholar
- Vroom KE (1957) The “H” factor: a means of expressing cooking times and temperatures as a single variable. Pulp Paper Mag Can 58:228–231Google Scholar
- Ziaie-Shirkolaee Y, Mohammadi-Rovshandeh J, Rezayati Charani P, Khajeheian MB (2007) Study on cellulose degradation during organosolv-delignification of wheat straw and evaluation of pulp properties. Iran Polym J 16(2):83–96Google Scholar