Jump to main content
Jump to site search

Issue 21, 2009
Previous Article Next Article

A hybrid material assembled by anthocyanins from açaí fruit intercalated between niobium lamellar oxide

Author affiliations

Abstract

Organic-inorganic hybrid materials can be prepared dispersing organic species into well-defined inorganic nanoblocks. This paper describes the immobilization of natural dyes from the extract of the Brazilian açaí-fruit into two types of layered hexaniobate precursors derived from H2K2Nb6O17: (i) colloidal dispersion of niobate exfoliated nanoparticles and (ii) niobate pre-intercalated with tetraethylammonium cations (TEA+). The restacking of exfoliated particles in the presence of açaí anthocyanins promotes their intercalation and produces stacked layers showing large basal spacing (ca. 50 Å). The TEA+ pre-intercalated niobate provides particles with lower content of dye species than the exfoliated precursor but with higher degree of organization and regularity according to X-ray diffraction data and images obtained by electron microscopies. Vibrational (FTIR and Raman) and 13C NMR spectroscopies indicate the presence of flavylium cations in the hybrid materials and spectral profiles characteristic of glycosylated anthocyanidins. According to thermal analysis results, the purplish hybrids materials are more stable than the free açaí-dyes. One hybrid sample was heated under air up to 170 °C and maintained at this temperature for 240 min. No weight loss events were observed and the sample retained its original color, indicating that the intercalation of anthocyanin into hexaniobate increases its thermal stability. Considering the structural, chemical, optical and thermal properties of the synthesized hybrid materials, they might be good candidates to be investigated for future specialized applications.

Graphical abstract: A hybrid material assembled by anthocyanins from açaí fruit intercalated between niobium lamellar oxide

Back to tab navigation

Supplementary files

Article information


Submitted
18 Nov 2008
Accepted
11 Mar 2009
First published
02 Apr 2009

Dalton Trans., 2009, 4136-4145
Article type
Paper

A hybrid material assembled by anthocyanins from açaí fruit intercalated between niobium lamellar oxide

Â. A. Teixeira-Neto, A. L. Shiguihara, C. M. S. Izumi, M. A. Bizeto, F. Leroux, M. L. A. Temperini and V. R. L. Constantino, Dalton Trans., 2009, 4136
DOI: 10.1039/B820610D

Social activity

Search articles by author

Spotlight

Advertisements