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    • 49. 发明授权
    • Calcium carbonate microstructures useful in encapsulation applications and a process for the preparation thereof
    • 用于封装应用的碳酸钙微结构及其制备方法
    • US09233084B2
    • 2016-01-12
    • US13045757
    • 2011-03-11
    • Rohit Kumar RanaGousia Begum
    • Rohit Kumar RanaGousia Begum
    • A61K31/155A61K31/65A61K31/704A61K49/00
    • A61K31/155A61K31/65A61K31/704A61K49/0043A61K49/0054A61K49/0091
    • A facile method to synthesize stable calcium carbonate microstructures is demonstrated which allows in situ encapsulation of sensitive molecules like drugs. The methodology involves a macromolecular assembly of anionic polypeptide with cationic peptide oligomer to concurrently template and hold to stabilize the mineralized structure. The heterogeneously distributed mixture of anionic and cationic residues in the macromolecular assembly, similar to that is found in natural systems assists in recognizing and coassembling Ca2+ and CO32− ionic clusters, especially for formation of a disordered precursor phase such as amorphous calcium carbonate (ACC) and further crystallization to form a metastable vaterite phase. The assembly also facilitates encapsulation of a guest molecule such as tetracycline at ambient conditions without affecting the mineralization process. The tetracycline-loaded microstructures show excellent antibacterial activities against many Gram-positive and Gram-negative bacterial strains and hence together with the fluorescence property of tetracycline and appropriate drug release profile, they can be used as multifunctional materials for therapeutic and imaging applications.
    • 证明了合成稳定的碳酸钙微结构的简便方法,其允许诸如药物的敏感分子的原位包裹。 该方法涉及阴离子多肽与阳离子肽低聚物的大分子组装,同时模板并保持以稳定矿化结构。 在大分子组装中的非均匀分布的阴离子和阳离子残基的混合物类似于天然系统中发现的,有助于识别和组装Ca 2+和CO 32离子簇,特别是用于形成无序碳酸钙(ACC)的无序前体相, 并进一步结晶以形成亚稳球霰石相。 组合物还有助于在环境条件下包封客体分子例如四环素而不影响矿化过程。 四环素负载的微结构对许多革兰氏阳性和革兰氏阴性细菌菌株显示出优异的抗菌活性,因此与四环素的荧光性质和合适的药物释放曲线一起,它们可以用作治疗和成像应用的多功能材料。