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Ficai M.,Polytechnic University of Bucharest | Ficai M.,National Research and Development Institute for Textiles and Leather INCDTP Division | Andronescu E.,Polytechnic University of Bucharest | Ficai D.,Polytechnic University of Bucharest | And 2 more authors.
Colloids and Surfaces B: Biointerfaces | Year: 2010

This work presents the synthesis of two hybrid materials: collagen (COLL)-polyvinyl alcohol (PVA) (1:2. wt) and collagen-polyvinyl alcohol/hydroxyapatite (HA) (1:2:3. wt). Starting from the above compositions, different kinds of composites were obtained based on the drying methods: controlled drying at 30 °C and freeze drying. The materials were analysed by X-ray diffraction (XRD), Fourier transform infrared microscopy (FTIR) and scanning electron microscopy (SEM) as well as by measuring the density, porosity and absorption of xylene for each sample by Arthur method. Based on the SEM images, the freeze drying and the controlled drying could be clearly concluded to lead to porous and dense COLL-PVA/HA hybrid materials, respectively. Such materials have exhibited a stratified morphology, the distance between sheets increasing with the increase of the organic components content. Based on the literature data, the obtained COLL-PVA/HA composite materials are valuable bone grafts materials and drug delivery systems. © 2010 Elsevier B.V. Source

Ficai A.,Polytechnic University of Bucharest | Albu M.G.,National Research and Development Institute for Textiles and Leather INCDTP Division | Birsan M.,Polytechnic University of Bucharest | Sonmez M.,Polytechnic University of Bucharest | And 4 more authors.
Journal of Molecular Structure | Year: 2013

The aim of this study was to study the influence of collagen hydrolysate (HAS) on the formation of ternary collagen-hydrolysate/hydroxyapatite composite materials (COLL-HAS/HA). During the precipitation process of HA, a large amount of brushite is resulted at pH = 7 but, practically pure HA is obtained at pH ≥ 8. The FTIR data reveal the duplication of the most important collagen absorption bands due to the presence of the collagen hydrolysate. The presence of collagen hydrolysate is beneficial for the management of bone and joint disorders such as osteoarthritis and osteoporosis. © 2013 Elsevier B.V. All rights reserved. Source

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