Reactive Red 120 and NI(II) Derived Poly(2-hydroxyethyl methacrylate) Nanoparticles for Urease Adsorption

Turkcan C., AKTAŞ UYGUN D., AKGÖL S., DENİZLİ A.

JOURNAL OF APPLIED POLYMER SCIENCE, cilt.131, sa.2, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 131 Sayı: 2
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1002/app.39757
  • Dergi Adı: JOURNAL OF APPLIED POLYMER SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Hacettepe Üniversitesi Adresli: Evet

Özet

Non-porous poly(2-hydroxyethyl methacrylate) [p(HEMA)] nanoparticles were prepared by surfactant free emulsion polymerization. The p(HEMA) nanoparticles was about 200 nm diameter, spherical form, and non-porous. Reactive Red 120 (RR 120) was covalently attached to the p(HEMA) nanoparticles and Ni(II) ions were incorporated to attach dye molecules. Urease was immobilized onto RR120-Ni(II) attached p(HEMA) nanoparticles via adsorption. The maximum urease adsorption capacity of RR120-Ni( II) attached p(HEMA) nanoparticles was 480.01 mg g(-1) nanoparticles at pH 7.0 in phosphate buffer. It was observed that urease could be repeatedly adsorbed and desorbed without significant loss in adsorption amount. K-m values were 21.50 and 34.06 mM for the free and adsorbed enzyme. The V-max values were 4 U for the free enzyme and 3.3 U for the adsorbed enzyme. The optimum pH was 25 mM pH 7 phosphate buffer for free and adsorbed enzyme. The optimum temperature was determined at 35 degrees C and 55 degrees C for the free and adsorbed enzyme, respectively. These findings show considerable promise for this material as an adsorption matrix in biotechnological applications. (C) 2013 Wiley Periodicals, Inc.