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Science 14 September 1990:
Vol. 249. no. 4974, pp. 1278 - 1281
DOI: 10.1126/science.2144663
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Articles

Science, Vol 249, Issue 4974, 1278-1281
Copyright © 1990 by American Association for the Advancement of Science

articles

Direct measurement of forces between linear polysaccharides xanthan and schizophyllan

DC Rau and VA Parsegian

Laboratory of Biochemistry and Metabolism, National Institute of Diabetes and Digestive and Kidney Diseases, National Institues of Health, Bethesda, MD 20892.

Direct osmotic stress measurements have been made of forces between helices of xanthan, an industrially important charged polysaccharide. Exponentially decaying hydration forces, much like those already measured between lipid bilayer membranes or DNA double helices, dominate the interactions at close separation. Interactions between uncharged schizophyllans also show the same kind of hydration force seen between xanthans. In addition to the practical possibilities for modifying solution and suspension properties through recognition and control of molecular forces, there is now finally the opportunity for theorists to relate macroscopic properties of a polymer solution to the microscopic properties that underlie them.


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Raman spectral evidence for hydration forces between collagen triple helices.
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