Abstract
New insight into the factors determining formation and stability of oxo-alkoxide carboxylates of titanium permits to design biocompatible systems for encapsulation of binary food quality inorganic dyes, such as Preussian blue, in a temperature-sensitive shell. The shells are formed spontaneously on hydrolysis of carboxylic acid-modified titanium alkoxides on the surface of water droplets containing the dye components. The complete dye is then prepared through mixing of pre-frozen encapsulated droplets which can be activated by heating to room temperature and also influenced by the storage time. The stable shells are obtained from longer chain carboxylates providing the micellar self-assembly derived constructions with increased colloid stability. The factors influencing the formation of individual crystalline oxo-alkoxide carboxylates—a process competing with the micellar self-assembly and decreasing the stability of the oxo-alkoxide carboxylate shells are discussed with the starting point in the molecular structures of the known compounds and also the new complexes Ti6O6(OAc)6(OiPr)6 · C6H14 (1) and Ti12O12(OAc)6(OnPr)18 (2).
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Acknowledgments
The authors express their gratitude to the Swedish Research Council (Vetenskapsrådet) for the financial support of the project “Molecular precursors and molecular models of nanoporous materials”. The Swedish Foundation for Strategic Environmental Research (MISTRA) is acknowledged for funding of the research programme Domestication of Microorganisms (DOM).
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Seisenbaeva, G.A., Ilina, E., Håkansson, S. et al. A new concept for titanium oxo-alkoxo-carboxylates’ encapsulated biocompatible time temperature food indicators based on arising, not fading color. J Sol-Gel Sci Technol 55, 1–8 (2010). https://doi.org/10.1007/s10971-010-2195-8
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DOI: https://doi.org/10.1007/s10971-010-2195-8