Thermal transformation of bioactive caffeic acid on fumed silica seen by UV-Vis spectroscopy, thermogravimetric analysis, temperature programmed desorption mass spectrometry and quantum chemical methods

Tetiana V. Kulik, Natalia O. Lipkovska, Valentyna M. Barvinchenko, Borys B. Palyanytsya, Olga A. Kazakova, Olesia O. Dudik, Alfréd Menyhárd, K. László

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9 Citations (Scopus)

Abstract

Thermochemical studies of hydroxycinnamic acid derivatives and their surface complexes are important for the pharmaceutical industry, medicine and for the development of technologies of heterogeneous biomass pyrolysis. In this study, structural and thermal transformations of caffeic acid complexes on silica surfaces were studied by UV-Vis spectroscopy, thermogravimetric analysis, temperature programmed desorption mass spectrometry (TPD MS) and quantum chemical methods. Two types of caffeic acid surface complexes are found to form through phenolic or carboxyl groups. The kinetic parameters of the chemical reactions of caffeic acid on silica surface are calculated. The mechanisms of thermal transformations of the caffeic chemisorbed surface complexes are proposed. Thermal decomposition of caffeic acid complex chemisorbed through grafted ester group proceeds via three parallel reactions, producing ketene, vinyl and acetylene derivatives of 1,2-dihydroxybenzene. Immobilization of phenolic acids on the silica surface improves greatly their thermal stability.

Original languageEnglish
Pages (from-to)132-141
Number of pages10
JournalJournal of Colloid and Interface Science
Volume470
DOIs
Publication statusPublished - May 15 2016

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Keywords

  • Hydroxycinnamic acid derivatives
  • Kinetic parameters
  • Silica
  • Surface complexes
  • Temperature-programmed desorption mass spectrometry
  • Thermal transformation

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Colloid and Surface Chemistry

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