Journal of Polymer and Biopolymer Physics Chemistry

ISSN (Print): 2373-3403

ISSN (Online): 2373-3411

Editor-in-Chief: Martin Alberto Masuelli

Website: http://www.sciepub.com/journal/JPBPC

   

Article

Exopolysaccharides Produced by Rhizobium: Production, Composition and Rheological Properties

1Federal University of Rio Grande, School of Chemistry and Food, Rio Grande, RS, Brazil


Journal of Polymer and Biopolymer Physics Chemistry. 2016, 4(1), 1-6
doi: 10.12691/jpbpc-4-1-1
Copyright © 2016 Science and Education Publishing

Cite this paper:
Ribeiro V.A., Burkert C.A.V.. Exopolysaccharides Produced by Rhizobium: Production, Composition and Rheological Properties. Journal of Polymer and Biopolymer Physics Chemistry. 2016; 4(1):1-6. doi: 10.12691/jpbpc-4-1-1.

Correspondence to: Ribeiro  V.A., Federal University of Rio Grande, School of Chemistry and Food, Rio Grande, RS, Brazil. Email: vanessa.amaralribeiro@gmail.com

Abstract

The use of exopolysaccharides (EPS) in industrial product formulations has increased in recent years due to their ability to increase the viscosity of solutions or cause the formation of gels, affecting the texture of products. In industry, EPS can be added as gelling, thickening and stabilizing agents in foods, pharmaceuticals and cosmetics. In this context, EPS from nitrogen-fixing rhizobial bacteria are emerging as potential biopolymers for industrial applications. However, the establishment of cultivation conditions, their chemical structure and physicochemical characteristics, such as rheological behavior, are essential to enable their use on a large scale. Furthermore, the possibility of using byproducts and agroindustrial wastes as substrates can contribute to the economic feasiability of the process. In this context, this article aims to present a review of EPS synthesized by different strains of Rhizobium in relation to their production, composition and rheological properties.

Keywords

References

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Article

Selective Adsorption of 2-nitrophenol, Phenol, Hydroquinone on Poly (Vinyl Alcohol) Crosslinked Glutaraldehyde-β-cyclodextrin Polymer Membrane

1Laboratory of Polymers Treatment and Forming, F.S.I, M’Hamed Bougara University, Boumerdes, Algeria


Journal of Polymer and Biopolymer Physics Chemistry. 2016, 4(1), 7-15
doi: 10.12691/jpbpc-4-1-2
Copyright © 2016 Science and Education Publishing

Cite this paper:
Ghemati Djamila, Aliouche Djamel, Amri Nedjla. Selective Adsorption of 2-nitrophenol, Phenol, Hydroquinone on Poly (Vinyl Alcohol) Crosslinked Glutaraldehyde-β-cyclodextrin Polymer Membrane. Journal of Polymer and Biopolymer Physics Chemistry. 2016; 4(1):7-15. doi: 10.12691/jpbpc-4-1-2.

Correspondence to: Ghemati  Djamila, Laboratory of Polymers Treatment and Forming, F.S.I, M’Hamed Bougara University, Boumerdes, Algeria. Email: ghemati_d@yahoo.fr

Abstract

The aim of this paper is to use poly (vinylalcohol) polymer membrane as an adsorbent for the removal of 2-nitrophenol, phenol, hydroquinone from aqueous solutions through the batch experiments. In order to obtain efficient adsorbent, cross-linked poly(vinyl alcohol)/glutaraldehyde-β-cyclodextrin membranes were prepared. Synthesized membranes were characterized by infrared spectroscopy and swelling measurements. Then, influence of pH, temperature on the adsorption process was investigated. As results, β-cyclodextrin is completely mixed into the PVA polymer without covalent bond formation. And absorption level of PVA/GA membranes is significantly improved by the presence of β-cyclodextrin. Adsorption capacity increases with increasing amount of cyclodextrin, and it reached the highest value at Ph < pKa; the change in adsorption capacities may be due to the structure effect, weight molecular of phenolic compounds. Therefore, results of adsorption isotherms indicated that the Freundlich isotherm model was more appropriate, the low temperature is favourable for adsorption and the negative value of free energy indicated the spontaneous nature process and easy regeneration of polymeric materials.

Keywords

References

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Article

Synthesis and Characterization of Branched Polyester: Thermal and Microbial Degradation Studies

1Laboratory Chemistry of Applied and Environmental, Faculty of Sciences, Mohammed Premier University, Oujda, Morocco

2Laboratory of Biochemistry and Biotechnology, Faculty of Sciences, Mohammed Premier University, Oujda, Morocco

3Faculty of Sciences and Techniques of Al Hoceima, BP 34, 32003 Ajdir, Mohammed Premier University, Morocco

4Laboratory of Physical Chemistry of Natural Resources and Environment - Department of Chemistry, Faculty of Sciences, Mohammed Premier University, Oujda, Morocco


Journal of Polymer and Biopolymer Physics Chemistry. 2016, 4(1), 16-27
doi: 10.12691/jpbpc-4-1-3
Copyright © 2016 Science and Education Publishing

Cite this paper:
Benarbia Abderrahim, Elidrissi Abderrahman, Aqil Mohamed, Amyay Aicha, Bellaouchi Reda, Asehraou Abdeslam, Jalal Isaad, Tahani abdesselam. Synthesis and Characterization of Branched Polyester: Thermal and Microbial Degradation Studies. Journal of Polymer and Biopolymer Physics Chemistry. 2016; 4(1):16-27. doi: 10.12691/jpbpc-4-1-3.

Correspondence to: Benarbia  Abderrahim, Laboratory Chemistry of Applied and Environmental, Faculty of Sciences, Mohammed Premier University, Oujda, Morocco. Email: benarbia111@hotmail.com

Abstract

A branched polyesters was synthesized using ethylene glycol, adipic acid and glycerol. It was characterized by FTIR, 1H and 13C-NMR, GPC, TGA/DTA. According to TGA analysis it was found that the mass loss is accomplished in two stages, the lower one was slightly distinguished in TGA. The Flynn-Ozawa-Wall method was applied for the principal reaction and the activation energies for all values of α were determined. The biodegradation process was also investigated in liquid culture media using two strains of Penicillium sp S1 and Aspergillus sp S2 which were isolated from the discharge of Oujda city (Morocco). According to the growth curves, it was found that the Penicillium sp S1 and Aspergillus sp S2 used the polyester as source of carbon. We have noted using FTIR spectra a decrease of the band intensity at δ =1170 cm-1 characteristic of the stretching vibration of C–O–C and also a decrease of the ester band group. The results obtained were compared with those of polyesters biodegradation reported in our previous work [27,28,29]. We have also proposed an enzyme degradation mechanism and hypothesis for an empirical mathematical formula giving the relationship between the thermal degradation and the biodegradation rate constant of the polyester.

Keywords

References

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