Curcumin-β-cyclodextrin inclusion complex: stability, solubility, characterisation by FT-IR, FT-Raman, X-ray diffraction and photoacoustic spectroscopy, and food application.
Curcumin was complexed with β-CD using co-precipitation, freeze-drying and solvent evaporation methods. Co-precipitation enabled complex formation, as indicated by the FT-IR and FT-Raman techniques via the shifts in the peaks that were assigned to the aromatic rings of curcumin. In addition, photoacoustic spectroscopy and X-ray diffraction, with the disappearance of the band related to aromatic rings, by Gaussian fitting, and modifications in the spectral lines, respectively, also suggested complex formation. The possible complexation had an efficiency of 74% and increased the solubility of the pure colourant 31-fold. Curcumin-β-CD complex exhibited a sunlight stability 18% higher than the pure colourant. This material was stable to pH variations and storage at -15 and 4°C. With an isothermal heating at 100 and 150°C for 2h, the material exhibited a colour retention of approximately 99%. The application of curcumin-β-CD complex in vanilla ice creams intensified the colour of the products and produced a great sensorial acceptance.
Postgraduate Program in Food Science, State University of Maringá (UEM), Av. Colombo 5790, 87020-900 Maringá, PR, Brazil.
Camila Sampaio
CS
Mangolim
Department of Pharmacy, State University of Maringá (UEM), Av. Colombo 5790, 87020-900 Maringá, PR, Brazil.
Cristiane
C
Moriwaki
Department of Physics, State University of Maringá (UEM), Av. Colombo 5790, 87020-900 Maringá, PR, Brazil.
Ana Claudia
AC
Nogueira
Department of Physics, State University of Maringá (UEM), Av. Colombo 5790, 87020-900 Maringá, PR, Brazil.
Francielle
F
Sato
Department of Physics, State University of Maringá (UEM), Av. Colombo 5790, 87020-900 Maringá, PR, Brazil.
Mauro Luciano
ML
Baesso
Department of Physics, State University of Maringá (UEM), Av. Colombo 5790, 87020-900 Maringá, PR, Brazil.
Antônio Medina
AM
Neto
Postgraduate Program in Food Science, State University of Maringá (UEM), Av. Colombo 5790, 87020-900 Maringá, PR, Brazil; Department of Pharmacy, State University of Maringá (UEM), Av. Colombo 5790, 87020-900 Maringá, PR, Brazil. Electronic address: gmatioli@uem.br.
Graciette
G
Matioli
D003474:Curcumin / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D011108:Polymers / Q000737:chemistry; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis; D013059:Spectrum Analysis, Raman; D014961:X-Ray Diffraction; D047392:beta-Cyclodextrins / Q000737:chemistry*
D011108:Polymers; D047392:beta-Cyclodextrins; D003474:Curcumin; C031215:betadex
Co-precipitation; Curcumin; Cyclodextrin; Molecular inclusion; Natural colourant; Spectroscopic techniques