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Effects of Gum Arabic on Properties of Collagen-hydroxyapatite Composite

FENG Wen-Po~1,QI Yuan-Ming~2,TANG Ke-Yong~1 (1.College of Materials Science & Engineering,Zhengzhou University,Zhengzhou 450001,China;2.Bioengineering Department, Zhengzhou University,Zhengzhou 450001,China)  
In order to improve the interfacial bonding properties of collagen-hydroxyapatite(Col-HA) composite, gum Arabic was introduced in the system.Ca(NO_3)_2·4H_2O,(NH_4)_2HPO_4,acid dissolved collagen,and gum Arabic were used as the raw materials to in situ prepare collagen-hydroxyapatite/gum Arabic(Col-HA/Gum A) composite. Crystallite phase,chemical composition,and micro-morphology of the composite were characterized by XRD,FT-IR, and SEM.The effects of gum Arabic on the structure and properties of the collagen-hydroxyapatite composite were analyzed.The results indicate that both the interface structure and the surface morphology of the collagen -hydroxyapatite composite are changed by the introduction of gum Arabic.With increasing the amount of gum Arabic in the system,the sizes of the crystal grain and the crystallinity of the Col-HA composite are decreased.Both the hydrophilic properties and the enzymatic degradation capacity in vitro of the composite are decreased significantly (P0.01),whilst the mechanical properties of the composite are improved in a certain range.Complexes of protein -polysaccharide can be formed between the gum Arabic and the collagen or collagen-hydroxyapatite,and the gum Arabic can act as a cross-linking agent in the new composite.
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