The Terpolymer Produced by Azotobacter Chroococcum 7B: Effect of Surface Properties on Cell Attachment |
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| Authors: | Anton Bonartsev Sergey Yakovlev Arasha Boskhomdzhiev Irina Zharkova Dmitrii Bagrov Vera Myshkina Tatiana Mahina Elena Kharitonova Olga Samsonova Anton Zernov Vsevolod Zhuikov Yurii Efremov Vera Voinova Garina Bonartseva Konstantin Shaitan |
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| Affiliation: | 1. Faculty of Biology, Moscow State University, Moscow, Russia.; 2. A.N.Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia.; 3. Faculty of Physics, Moscow State University, Moscow, Russia.; LAAS-CNRS, France, |
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| Abstract: | The copolymerization of poly(3-hydroxybutyrate) (PHB) is a promising trend in bioengineering to improve biomedical properties, e.g. biocompatibility, of this biodegradable polymer. We used strain Azotobacter chroococcum 7B, an effective producer of PHB, for biosynthesis of not only homopolymer and its main copolymer, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB-HV), but also novel terpolymer, poly(3-hydroxybutyrate-co-3-hydroxyvalerate)-poly(ethylene glycol) (PHB-HV-PEG), using sucrose as the primary carbon source and valeric acid and poly(ethylene glycol) 300 (PEG 300) as additional carbon sources. The chemical structure of PHB-HV-PEG was confirmed by 1H nuclear-magnetic resonance analysis. The physico-chemical properties (molecular weight, crystallinity, hydrophilicity, surface energy) of produced biopolymer, the protein adsorption to the terpolymer, and cell growth on biopolymer films were studied. Despite of low EG-monomers content in bacterial-origin PHB-HV-PEG polymer, the terpolymer demonstrated significant improvement in biocompatibility in vitro in contrast to PHB and PHB-HV polymers, which may be coupled with increased protein adsorption, hydrophilicity and surface roughness of PEG-containing copolymer. |
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