Molecular Weight and Aggregation of Erwinia Gum in Aqueous Solutions

Chemical Research in Chinese Universities ›› 2000, Vol. 16 ›› Issue (2): 156-162.

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Molecular Weight and Aggregation of Erwinia Gum in Aqueous Solutions

ZHANG Lina¹, XU Xiao-juan¹, ZHU Rong-Ping², Iijima Hideki³

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

Received:1999-04-22 Online:2000-04-24 Published:2011-08-17
Supported by:
Supported by the National Natural Science Foundation of China.

Abstract

Abstract: Erwinia(E) gum is composed of glucose, fucose, galactose and glucuronic acid. The weight-average molecular weights M_w, number-average molecular weights M_n and intrinsic viscosities[η] of the four fractions and the unfractionated Egum in aqueous solutions at desired temperatures were studied by light scattering, membrane osmometry, size exclusion chromatography(SEC) and viscometry. The experimental results prove that Egum formed aggregates in the aqueous solution at 25 ℃ and the aggregates were broken gradually with increasing temperature. The dissociation of the aggregates of Egum in the aqueous solution started at 36 ℃, and was completed at around 90 ℃. The [η] values of Egum and its fractions are much higher than those of the conventional polymers with the similar molecular weights, and decrease with increasing NaCl concentration.

Key words: Erwinia gum, Light scattering, SEC, Membrane osmometry, Viscometry, Molecular weight, Aggregation

ZHANG Lina, XU Xiao-juan, ZHU Rong-Ping, Iijima Hideki . Molecular Weight and Aggregation of Erwinia Gum in Aqueous Solutions[J]. Chemical Research in Chinese Universities, 2000, 16(2): 156-162.

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Molecular Weight and Aggregation of Erwinia Gum in Aqueous Solutions

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