期刊
BIORESOURCE TECHNOLOGY
卷 97, 期 15, 页码 1822-1827出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2005.09.008
关键词
cyanobacteria; extracellular polysaccharide; thermal degradation; viscosity; xylose
Four cyanobacterial strains, Cyanothece sp., Oscillatoria sp., Nostoc sp. and Nostoc carneum were studied for physico-chemical characterization of extracellular polysaccharide (EPS) secreted during the controlled growth condition. Hydrolyzed EPSs showed the compositional involvement of four sugar moieties viz. mannose, glucose, xylose and ribose in varying combinations. Infrared spectra of EPSs showed a specific absorbance of O-H stretching at 3448-3400cm(-1), asymmetrical-symmetrical C-H stretching at 2924 and 2854cm(-1) and a bending vibration of C-H at 1400-1380 cm(-1). Absorbance at 1259 and 1140cm(-1) with Cyanothece sp. EPS, indicated the presence of sulfur containing functional group. Thermal gravimetric analysis and differential scanning calorimetric analysis confirmed the polysaccharides thermal stability as high as around 250 degrees C. In the presence of 0.1 M NaCl aqueous solution, the intrinsic viscosity of polysaccharides from Oscillatoria sp. and Nostoc sp. decreased 1.6 fold, whereas, 3-5 fold reduction in intrinsic viscosity was observed with commercially available guar and xanthan gum. (c) 2005 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据