Solution Properties of Conventional Gum Arabic and a Matured Gum Arabic (Acacia (sen) SUPER GUM)

详细信息    查看全文

• 作者：Qi Wang ; Walther Burchard ; Steve W. Cui ; Xiaoqing Huang ; Glyn O. Phillips
• 刊名：Biomacromolecules
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：9
• 期：4
• 页码：1163 - 1169
• 全文大小：436K
• 年卷期：v.9,no.4(April 2008)
• ISSN：1526-4602

文摘

Dilute solution properties of two specially matured gum arabic samples (EM1 and EM2) were compared to the conventional gum (EM0) using static light scattering. The apparent molar mass (M_w,app) and radius of gyration (R_g,app) for the three samples showed unusual concentration dependence. These data were satisfactorily interpreted by a simple association model that takes into account the repulsive interaction among clusters, which allowed us to obtain the true molar mass (M_w(0)) and radius of gyration (R_g(0)). A common power law relation was observed between M_w(0) and R_g(0), giving a somewhat higher exponent than expected for linear and branched polymers in a good solvent. M_w(0) and R_g(0) obtained for the three gums do not differ significantly from each other. However, the data showed clearly a constant increase of the association from EM0 to EM2 with increasing concentration. This is in accordance with the previously observed improved functional properties for the matured products.