Isolation and Characterization of Cellulose Obtained from Ultrasonic Irradiated Sugarcane Bagasse
- 7 July 2006
- journal article
- Published by American Chemical Society (ACS) in Journal of Agricultural and Food Chemistry
- Vol. 54 (16), 5742-5748
- https://doi.org/10.1021/jf060929o
Abstract
Cell walls of sugarcane bagasse were first delignified with chlorite followed by ultrasonic irradiation and then by two-step sequential extractions at 23 °C with 15 and 18% KOH for 2 h, 15 and 18% NaOH for 2 h, 8 and 10% KOH for 12 h, and 8 and 10% NaOH for 12 h and by a single one-stage isolation with 10% KOH for 16 h and with 10% NaOH for 16 h, which released 79.4, 81.8, 83.6, 85.7, 61.5, and 65.6% of the original hemicelluloses, and subsequently yielded 50.7, 49.5, 48.6, 47.8, 57.2, and 55.4% of the cellulose, respectively. The six cellulosic preparations were free of bound lignin and had a purity of 77.1−90.1% with the intrinsic viscosity (η), viscosity average degree of polymerization, and molecular weight (Mw) ranging from 534.1 to 631.6 mL g-1, from 1858.1 to 2238.2 mL g-1, and from 301000 to 362600 g mol-1, respectively. The structural features of the isolated six cellulosic samples were comparatively examined by Fourier transform infrared and cross-polarization/magic angle spinning 13C NMR spectroscopy and X-ray diffraction, and their thermal stability was investigated by using thermogravimetric analysis. It was found that all of the cellulosic preparations have the typical cellulose I structure but the crystallinity of the SCB cellulose was lower than that of flax, cotton, and kenaf. Keywords: Cellulose; ultrasonic irradiation; bagasse; FT-IR; CP/MAS 13C NMR; X-rayKeywords
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