Molecular Weight and Aggregation of Erwinia Gum in Aqueous Solutions |
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Authors: | ZHANG Li-na XU Xiao-juan ZHU Rong-Ping Iijima Hideki |
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Institution: | 1. Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China;
2. National Research Center for Certified Reference Materials, Beijing 100013, P. R. China;
3. Chemical Technology Department Ⅳ, Asahi Chemical Industry Co. Ltd., Miyazaki 882-8847, Japan |
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Abstract: | Erwinia(E) gum is composed of glucose, fucose, galactose and glucuronic acid. The weight-average molecular weights Mw, number-average molecular weights Mn and intrinsic viscositiesη] of the four fractions and the unfractionated E gum in aqueous solutions at desired temperatures were studied by light scattering, membrane osmometry, size exclusion chromatography(SEC) and viscometry. The experimental results prove that E gum formed aggregates in the aqueous solution at 25 ℃ and the aggregates were broken gradually with increasing temperature. The dissociation of the aggregates of E gum in the aqueous solution started at 36 ℃, and was completed at around 90 ℃. The η] values of E gum and its fractions are much higher than those of the conventional polymers with the similar molecular weights, and decrease with increasing NaCl concentration. |
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Keywords: | Erwinia gum Light scattering SEC Membrane osmometry Viscometry Molecular weight Aggregation |
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