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ADSORPTION AND RELEASE STUDIES OF TETRACYCLINE FROM A BIOACTIVE GLASS Na 2 CO 3 as SiO, CaO, P 2 O 5 and Na 2 O precursors, respectively. After maturation at room temperature for 30 days, the sample was heat treated at 310°C for 1 hour. Tetracycline adsorption was carried out by incubating the sample in phosphate buffered saline (PBS) enriched with tetracycline (7 mg/ml). The sample was analysed after immersion at 37°C for about 6 hours in order to establish the amount of adsorbed tetracycline. For delivery assays, 35 mg tetracycline loaded glass was individually immersed in 10 ml simulated body fluid (SBF) prepared according to Kokubo protocol [6], pH 7.4, and kept at 37°C for 2, 5, 24, 48 and 96 hours in Falcon tubes, with continuous agitation. After each period, the SBF solution was completely removed from the tube for analysis and replaced by another freshly prepared solution. The same amount of glass without tetracycline was immersed in SBF for a total time of 96 hr and the SBF was replaced according to the immersion periods of time previously mentioned. The amounts of withdrawn solution were analyzed by UV-vis Spectroscopy and Differential Pulsed Voltammetry (DPV). The concentration of the released tetracycline was monitored in a three electrode configuration TRACELAB 150, using a hanging mercury drop electrode [7]. Sample characterization was made using Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopic (FTIR) and X- ray Photoelectron Spectroscopy (XPS). SEM images before and after tetracycline loading were recorded using a JEOL JSM 7000F Scanning Electron Microscope. XPS measurements were performed using a SPECS PHOIBOS 150 MCD system equipped with monochromatic Al-K α source (250 W, hν=1486.6 eV), hemispherical analyser and multichannel detector. The vacuum in the analysis chamber during the measurements was in the range of 10 -9 -10 -10 mbar. The binding energy scale was charge referenced to the C 1s at 284.6 eV. The FTIR spectra were recorded in reflection configuration by a Jasco IRT-5000 FT-IR spectrometer in the range 4000-650 cm -1 with a resolution of 4 cm -1 . ACKNOWLEDGMENTS Theisresearch was accomplished in the framework of PNII Idei PCCE-248 /2008 project granted by the Romanian National University Research Council. E.V. and Z. B acknowledge financial support from a program co-financed by the European Social Fund through the Sectoral Operational Program for Human Resources Development, Contract POSDRU/89/1.5/S/60189 - „Innovative Postdoctoral Programs for Sustainable Development in a Knowledge Based Society” and respectively POSDRU/107/ 1.5/S/76841 with the title „Modern Doctoral Studies: Internationalization and Interdisciplinary”. 245
EMILIA VANEA, SIMONA CAVALU, FLORIN BĂNICĂ, ZSOLT BENYEY, GÜLTEKIN GÖLLER,VIORICA SIMON REFERENCES 1. A.L. Andrade, D.M. Souza, W.A. Vasconcellos, R.V. Ferreira, R.Z. Domingues, Journal of Non-Crystalline Solids, 2009, 355, 811. 2. A.L Andrade, D. Manzi, R.Z. Domingues, Journal of Non-Crystalline Solids, 2006, 352, 3502. 3. Z.R. Domingues, M.E. Cortes, T.A. Gomesa, H.F. Diniz, C.S. Freitas, J.B. Gomes, A.M.C. Fariac, R.D Sinisterra, Biomaterials, 2004, 25, 327. 4. U.M.E. Wikesjo, P.J. Baker, L.A. Christersson, R.J. Genco, R.M. Lyall, S. Hic, R.M. Diflorio, V.P. Terranova, Journal of Periodontal Research, 1986, 21, 322. 5. B.N.A. Vandekerckhove, M. Quirynen, D. van Steenberghe, Journal of Periodontology, 1997, 68, 353. 6. T. Kokubo, H. Kushitani, S. Sakka, T. Kitsugi, T. Yamamuro, Journal of Biomedical Materials Research, 1990, 24, 721. 7. Y. Ni, S. Li, S. Kokot, Food Chemistry, 2011, 124, 1157. 8. M.I. Goller, C. Barthet, G.P. McCarthy, R. Corradi, B.P. Newby, S.A. Wilson, S.P. Armes, S.Y. Luk, Colloid and Polymer Science, 1998, 276, 1010. 9. E. Vanea, V. Simon, Applied Surface Science, 2011, 257, 2346. 10. S. Simon, R.V.F. Turcu, T. Radu, M. Moldovan, V. Simon, Journal of Optoelectronics and Advanced Materials, 2009, 11, 1660. 11. G. Polzonetti, M.V. Russo, A. Furlani, G. Iucci, Chemical Physics Letters, 1991, 185, 105. 12. H. Yoshino, K. Kamiya, H. Nasu, Journal of Non-Crystalline Solids, 1990, 126, 68. 13. I. Rehman, W. Bonfield, Journal of Materials Science: Materials in Medicine, 1997, 8, 1. 14. G. Reiter, N. Hassler, V. Weber, D. Falkenhagen, U.P. Fringeli, Biochimica et Biophysica Acta, 2004, 1699, 253. 15. G. Falini, E. Foresti, I.G. Lesci, B. Lunelli, P. Sabatino, N. Roveri, Chemistry - A European Journal, 2006, 12, 1968. 16. L. Olanoff, J.M. Anderson, Journal of Pharmaceutical Science, 1979, 68, 1151. 246
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CHEMIA 3/2011
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CORINA COSTESCU, LAURA CORPAŞ, NIC
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Studia Universitatis Babes-Bolyai C
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MONICA BAIA, MONICA SCARISOREANU, I
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STUDIA UBB CHEMIA, LVI, 3, 2011 (p.
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SPECTROSCOPIC EVIDENCE OF COLLAGEN
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