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    • 8. 发明授权
    • Sol-gel method for encapsulating molecules
    • 用于封装分子的溶胶 - 凝胶法
    • US06495352B1
    • 2002-12-17
    • US09548638
    • 2000-04-13
    • C. Jeffrey BrinkerCarol S. AshleyRimple BhatiaAnup K. Singh
    • C. Jeffrey BrinkerCarol S. AshleyRimple BhatiaAnup K. Singh
    • C12N1114
    • C12N11/14Y10S436/815Y10S436/829
    • A method for encapsulating organic molecules, and in particular, biomolecules using sol-gel chemistry. A silica sol is prepared from an aqueous alkali metal silicate solution, such as a mixture of silicon dioxide and sodium or potassium oxide in water. The pH is adjusted to a suitably low value to stabilize the sol by minimizing the rate of siloxane condensation, thereby allowing storage stability of the sol prior to gelation. The organic molecules, generally in solution, is then added with the organic molecules being encapsulated in the sol matrix. After aging, either a thin film can be prepared or a gel can be formed with the encapsulated molecules. Depending upon the acid used, pH, and other processing conditions, the gelation time can be from one minute up to several days. In the method of the present invention, no alcohols are generated as by-products during the sol-gel and encapsulation steps. The organic molecules can be added at any desired pH value, where the pH value is generally chosen to achieve the desired reactivity of the organic molecules. The method of the present invention thereby presents a sufficiently mild encapsulation method to retain a significant portion of the activity of the biomolecules, compared with the activity of the biomolecules in free solution.
    • 一种封装有机分子的方法,特别是使用溶胶 - 凝胶化学的生物分子。 二氧化硅溶胶由碱金属硅酸盐水溶液如二氧化硅和氧化钠在水中的混合物制备。 通过使硅氧烷缩合的速度最小化,将pH调节到适当的低值以稳定溶胶,由此允许在凝胶化之前溶胶的储存稳定性。 然后通常在溶液中的有机分子加入被包封在溶胶基质中的有机分子。 老化后,可以制备薄膜或用封装的分子形成凝胶。 根据使用的酸,pH和其他加工条件,凝胶化时间可以从一分钟到几天。 在本发明的方法中,在溶胶 - 凝胶和包封步骤期间不产生作为副产物的醇。 有机分子可以以任何所需的pH值加入,其中通常选择pH值以实现有机分子的所需反应性。 因此,与游离溶液中的生物分子的活性相比,本发明的方法提供了足够温和的包封方法以保持生物分子的活性的显着部分。