Visualization of the algal polysaccharide carrageenan by scanning tunnelling microscopy
作者： I. Lee , E.D.T. Atkins , M.J. Miles
DOI: 10.1016/0304-3991(92)90410-L
关键词: Molecule 、 Analytical chemistry 、 Polysaccharide 、 Molecular model 、 Aqueous solution 、 Quantum tunnelling 、 Diffraction 、 Microscopy 、 Chemistry 、 Carrageenan
摘要: Scanning tunnelling microscopy has been used to obtain images in the constant-current mode air and moist conditions at molecular resolution for kappa- iota-carrageenan algal polysaccharides. The molecules were deposited from an aqueous solution onto a graphite substrate. samples formed aligned nematic-like arrays also found as individual molecules. dimensions of width, height repeat distance along molecule be close values previously determined by X-ray diffraction. results support model based on double-helix structure carrageenan.
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