title: Characterization of water-soluble complexes of polyacrylic acid with alpha-Amylase from Aspergillus oryzae.
abstract: Polycomplex formation of alpha-Amylase from Aspergillus oryzae (TAKA) with polyacrylic acid (PAA) was studied by pH titration, fluorescence, and high performance liquid chromatography (HPLC) methods in water solutions. According to the our results, the complex formation and its solubility were depended on nature of enzyme and the pH of solutions. Both of them correlates isoelectric points (PI). The stability of PAA-amylase complexes was negligibly weak at pH 7 [pH > pI (isoelectric pH)]. Stable water-soluble polycomplexes were formed at pH 5 (pI approximately 4.5) and coexisted with free protein molecules. Insoluble complexes has been observed at pH < 4.5. The frozen storage stabilities of the obtained complexes were also studied by measuring the activities at different pH.
authors.affiliation: Faculty of Arts and Sciences, Department of Chemistry, Yildiz Technical University, Davutpasa Campus, 34210, Esenler, Istanbul, Turkey. maltikatoglu@yahoo.com
authors.forename: Melda
authors.initials: M
authors.lastname: Altikatoglu
authors.forename: Ozlem
authors.initials: O
authors.lastname: Tavukcuoglu
authors.forename: Mamed
authors.initials: M
authors.lastname: Mustafaev
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D001236:Aspergillus oryzae / Q000201:enzymology*; D005656:Fungal Proteins / Q000737:chemistry / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D014867:Water / Q000737:chemistry*; D000516:alpha-Amylases / Q000737:chemistry / Q000378:metabolism
chemical_list: D000180:Acrylic Resins; D005656:Fungal Proteins; D014867:Water; C006903:carbopol 940; D000516:alpha-Amylases