Adil DENİZLİ, Sinan AKGÖL, Münire Nalan TUZMEN, Tülden KALBURCU

7696

Immobilized metal ion affinity nanospheres for α-amylase immobilization

Immobilized metal ion affinity nanospheres for α-amylase immobilization

Immobilized metal chelate affinity chromatography (IMAC) support was practiced for α -amylase immo- 2+ 2+bilization. Poly(hydroxyethylmethacrylate-methacryloylamidotryptophan)-Ni [p(HEMA-MAT)-Ni ] nanospheres, average diameter 100 nm, were produced by surfactant free emulsion polymerization. Characterizations of p(HEMA- MAT)-Ni 2+ nanospheres were carried out by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscope (SEM). In addition, average particle size, size distribution, and surface charge were specified. The amount of N-methacryloylamidotryptophan (MAT) incorporated to polymer was determined as 1.95 mmol/g polymers by using nitrogen stoichiometry. The specific surface areas of poly(hydroxyethylmethacrylate) [p(HEMA)] and p(HEMA-MAT) 2 2nanospheres were calculated as 1856 m /g and 1914 m /g, respectively. Protein adsorption increased with increasing initial protein concentration and maximum α -amylase adsorption on p(HEMA-MAT)-Ni 2+ nanospheres was observed at pH 4.0. Both free and immobilized α -amylase showed pH optimum at pH 7.0. It was determined that the immobilized α -amylase had better thermostability than the free one. Immobilization of the enzyme did not significantly change the kinetic parameters. The storage stability of α -amylase increased upon immobilization. It was also observed that 2+p(HEMA-MAT)-Ni nanospheres can be repeatedly used for α -amylase immobilization.
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Turkish Journal of Chemistry-Cover
  • ISSN: 1300-0527
  • Yayın Aralığı: 6
  • Yayıncı: TÜBİTAK
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