A Study on Number Average Molecular Weight of Xanthan

Abstract

Abstract: The number average molecular weights M_n and the second virial coefficients A₂for six fractions of xanthan sonicated fragments were measured by an improved Bruss membrane osmometer according to dynamic and high speed static osmometry in_0.1 mol/Laqueous solution of NaCl, cadoxen and water/cadoxen mixtures at 25℃. The ratio M_n(in 0. 1 mol/L NaCl)/M_n(in cadoxen) was equal nearly to 2. It is concluded that the double-stranded helix and a few bi-or perhaps multi-molecular associates of xanthan coexist in 0. 1 mol/Laqueous NaCl, and dissociate into single random coil chains in pure cadoxen. When the weight fraction W_cadof cadoxen in the mixed solvent was about 0. 6, the double helical structure was almost completely broken to single.

Key words: Polysaccharide, Xanthan, Double helix conformation, Membrane osmometry, Number average molecular weight

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Zhang Li-na, Huang Ai-hui, Xu Jing-juan . A Study on Number Average Molecular Weight of Xanthan[J]. Chem. J. Chinese Universities, 1991, 12(8): 1126.

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A Study on Number Average Molecular Weight of Xanthan

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