Interaction of glucuronic acid and iduronic acid-rich glycosaminoglycans and their modified forms with hydroxyapatite

Proteoglycans and their spatial arms, glycosaminoglycans (GAGs), are known to interact with hydroxyapatite (HAP) and have been implicated as important modulators of mineralisation. In the present study isotherm data (0.02 m sodium acetate, pH 6.8) revealed that the iduronic-rich GAGs heparan sulphat...

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Bibliographic Details
Published in:Biomaterials 2002, Vol.23 (2), p.481-489
Main Authors: Rees, Sarah G, Hughes Wassell, Diana T, Embery, Graham
Format: Article
Language:English
Subjects:
Adsorption
Desorption
Glucuronic Acid - chemistry
Glycosaminoglycans
Glycosaminoglycans - chemistry
Hydroxyapatite
Hydroxyapatites - chemistry
Iduronic Acid - chemistry
Mineralisation
Proteoglycans
Thermodynamics
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Summary:Proteoglycans and their spatial arms, glycosaminoglycans (GAGs), are known to interact with hydroxyapatite (HAP) and have been implicated as important modulators of mineralisation. In the present study isotherm data (0.02 m sodium acetate, pH 6.8) revealed that the iduronic-rich GAGs heparan sulphate, heparin and dermatan sulphate showed greater binding onto HAP with higher adsorption maxima compared with the glucuronic acid-rich GAGs chondroitin-4-sulphate, chondroitin-6-sulphate and hyaluronan. Chemically desulphated chondroitin showed no adsorption onto HAP. With the exception of hyaluronan, the GAGs studied showed no desorbability in sodium acetate buffer only, whereas in di-sodium orthophosphate, desorption occurred much more readily. The data indicates that GAG chemistry and conformation in solution greatly influence the interaction of these molecules with HAP. The conformational flexibility of iduronic acid residues may be an important determinant in the strong binding of iduronic acid-rich GAGs to HAP, increasing the possibility of the appended anionic groups matching calcium sites on the HAP surface, compared with more rigid glucuronic acid residues. This work provides important information concerning interfacial adsorption phenomena between the organic–inorganic phases of mineralised systems.
ISSN:0142-9612
1878-5905
DOI:10.1016/S0142-9612(01)00130-2