Doping Uric Acid Crystals. 1. Uric Acid Dihydrate

作者：Zellelow Amanuel Z; Abiye Melat; Fink Dorothy A; Ford Catherine E; Kim Kun Hae; Sours Ryan E; Yannette Clare M; Swift Jennifer A^*

来源：Crystal Growth & Design, 2010, 10(8): 3340-3347.

DOI：10.1021/cg1005049

The crystallization of uric acid dihydrate (UAD) from model supersaturated aqueous solutions containing 21 different molecular dye probes and 11 inorganic salts was investigated. UAD crystals grown at room temperature were found to include low concentrations (0.01-0.42%) of cationic and neutral dyes but not anionic dyes. From dilute dye solutions, a preference for inclusion in either {011) or {102} growth sectors was exhibited for some dyes while others showed little specificity. At higher dye concentrations, inclusion generally increased but specificity tended to diminish. Crysoidine G was exceptional in that over a broad range of solution concentrations, it was consistently and exclusively included on growth hillocks located in {011} sectors. Most dye-doped UAD crystals also exhibited morphological changes, namely the development of {210) faces, which are typically absent in pure UAD crystals. UAD grown from salt solutions showed inclusion of Na(+), K(+), and Mg(2+) ions in concentrations similar to dyes; however, none affected the macroscopic morphology. While the literature has numerous examples showing that anionic and polyanionic species can assert dramatic effects on the mineralization of inorganic phases, this study suggests that cationic species may play a more pronounced role in the crystallization of other types of biomaterials.

• 出版日期2010-8