News Column

Researchers' Work from University of Warsaw Focuses on Polyethylene Glycols

June 24, 2014

By a News Reporter-Staff News Editor at Life Science Weekly -- Data detailed on Polyethylene Glycols have been presented. According to news reporting out of Warsaw, Poland, by NewsRx editors, research stated, "Supramolecular hydrogels of conducting polymers are successfully used in bioelectrochemistry because of their mechanical and swelling properties of gels added to the specific electron transport properties of conducting polymers. We have studied polyaniline-poly(styrene sulfonate) (PANI-PSS) hydrogel as a substrate for the urease."

Our news journalists obtained a quote from the research from the University of Warsaw, "The hydrogels were synthesized at pH = 0 and pH = 5. PANI-PSS hydrogel is a supramolecular self-assembly material consisting of positively-charged PANI chains and negatively-charged PSS chains. The hydrogel was studied by cyclic voltammetry, infrared and Raman spectroscopy and Scanning Electron Microscopy (SEM). Raman spectra revealed presence of phenazine rings in the hydrogel structure. Phenazine rings form covalent cross-linkers contributing to the hydrogel mechanical stability. The covalent cross-linkers influence the cyclic voltammetry responses of the hydrogel in acidic media. We tested the activity of urease immobilized in the PANI-PSS hydrogel by the physical adsorption or by the covalent bonding with the carbodiimide reaction. The enzyme immobilized in hydrogels prepared at higher value reveals significantly higher sensitivity. The method of the enzyme immobilization has smaller impact on the sensitivity. All hydrogel sensors reveal largely higher sensitivity to urea comparing to urease immobilized in the typical electrochemically deposited PANI films. The sensitivity of urease covalently bond to the hydrogel obtained at pH = 5 was as high as 1693 mu A/(mol dm(3))."

According to the news editors, the research concluded: "The sensor response was linear in the urea concentration range from 10(-4) to 7 X 10(-2) mol/dm(3)."

For more information on this research see: Supramolecular polyaniline hydrogel as a support for urease. Electrochimica Acta, 2014;126():90-97. Electrochimica Acta can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England (see also Polyethylene Glycols).

Our news journalists report that additional information may be obtained by contacting A. Sioniewska, University of Warsaw, Dept. of Chem, PL-02093 Warsaw, Poland.

Keywords for this news article include: Warsaw, Poland, Europe, Urease, Alcohols, Hydrogel, Nanotechnology, Supramolecular, Amidohydrolases, Organic Chemicals, Polyethylene Glycols, Emerging Technologies, Enzymes and Coenzymes

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC

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Source: Life Science Weekly

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