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Renewable cellulose source: Isolation and characterisation of cellulose from rice stubble residues
(2015) Pattrathip Rodsamran; Rungsinee Sothornvit; R. Sothornvit; Department of Food Engineering, Faculty of Eng. at Kamphaengsaen/PHTIC/Center of Excell. for Agricultural and Food Machinery, Center of Advanced Studies in Industrial Technology, Kasetsart University, Nakhonpathom, Kamphaengsaen Campus, 73140, Thailand; email: fengrns@ku.ac.th
The substantial amount of agricultural waste associated with rice stubble is a critical issue in Thailand as it still contains a high amount of cellulose. Thus, the conditions for cellulose isolation from Thai rice stubble were developed. It was found that cellulose at a higher NaOH concentration (10%) or higher isolation temperature provided a higher whiteness index (WI) value and _-cellulose content after 3 h of isolation process. Extraction using 10% NaOH at 55 �C for 3 h was determined as optimum conditions for the isolation of cellulose from rice stubble. The removal of most hemicelluloses and lignin was confirmed by Fourier transform infrared spectroscopy. The yield, WI value and _-cellulose content of rice stubble cellulose were 30.67%, 75.69% and 90.05%, respectively. Cellulose from rice stubble is suitable for use as fibre or for the synthesis of cellulose derivatives that are widely used in food and pharmaceutical products. � 2015 Institute of Food Science and Technology.