Hierarchical biomineralization of calcium carbonate regulated by silk microspheres

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• 作者：Xiuli Zhang^a ; ¹ ; Zhihai Fan^b ; ¹ ; Qiang Lu^a ; ^{lvqiang78@suda.edu.cn} ; Yongli Huang^a ; David L. Kaplan^c ; Hesun Zhu^d
• 关键词：Silk fibroin ; Biomineralization ; Calcium carbonate ; Hierarchical structure ; Vaterite
• 刊名：Acta Biomaterialia
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：9
• 期：6
• 页码：6974-6980
• 全文大小：1670 K

文摘

As an analog of the main protein contained in nacre regenerated Bombyx mori silk fibroin has a significant influence on the morphology and polymorphic nature of CaCO₃ in the biomineralization process. A number of studies have implied that the self-assembling aggregate structure of silk fibroin is a key factor in controlling CaCO₃ aggregation. Further insight into this role is necessary with a particular need to prepare silk fibroin aggregates with homogeneous structures to serve as templates for the mineralization process. Here we have prepared homogeneous silk microspheres to serve as templates for CaCO₃ mineralization in order to provide an experimental insight into silk-regulated crystallization processes. CaCO₃ particles with different nano- and microstructures, and their polymorphs, were successfully formed by controlling the mineralization process. The key function of silk aggregation in controlling the morphology and polymorphic nature of CaCO₃ particles was confirmed. A regulating effect of silk on the spatial features was also observed. A two-step process for silk fibroin-regulated biomineralization was found, with different levels of heterogeneous nucleation and aggregation. A full understanding of silk fibroin-regulated biomineralization mechanisms would help in understanding the function of organic polymers in natural biomineralization, and provide a way forward in the design and synthesis of new materials in which organic-inorganic interfaces are the keys to function, biological interfaces and many related material features.