Modulation of Calcium Oxalate Crystallization by Colloidal Selenium Nanoparticles–Polyphenol Complex

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• 作者：Liyan Chen ; Zixia Deng ; Cailing Zhong ; Yanhui Zhou ; Yan Bai
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：May 4, 2016
• 年：2016
• 卷：16
• 期：5
• 页码：2581-2589
• 全文大小：684K
• 年卷期：0
• ISSN：1528-7505

文摘

The nanoSe⁰-polyphenol complexes with a 3:1 polyphenol/nanoSe⁰ molar ratio were prepared by colloidal selenium nanoparticles (nanoSe⁰) modified with gallic acid (GA), propyl gallate (PG), and pyrogallic acid (PA), which were spherical with average diameter about 38–77 nm. On this basis, we studied the effect of nanoSe⁰-polyphenol on the CaC₂O₄ crystallization and also elaborated the modulation mechanism, which were compared with those for each polyphenol individually. NanoSe⁰-GA and nanoSe⁰-PA were easy to induce the formation of calcium oxalate dihydrate (COD) crystals, while nanoSe⁰-PG induced the formation of quasi-rectangular calcium oxalate monohydrate (COM), multilayered calcium oxalate trihydrate (COT) crystals, and an amount of COD crystals in a dose-dependent fashion by nanoSe⁰-PG. The strong effect of nanoSe⁰-polyphenol on the formation of COD and COT crystals could be attributed to electrostatic interaction between nanoSe⁰-polyphenol and CaC₂O₄ crystals. The results obtained in the polyphenol system were similar to, as well as different from, nanoSe⁰-polyphenol because the effect of the polyphenol on the CaC₂O₄ crystallization could result from not only electrostatic interaction between polyphenols and Ca²⁺ ions, but also hydrogen bonding interaction between the polyphenols and C₂O₄^2– groups. All the obtained COD crystals were thermostable even at 70 °C, while COT crystals were temperature dependent.