Browsing by Author "Akkaya, Birnur"
Now showing items 1-19 of 19
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Adsorption isotherms, kinetics, thermodynamics and desorption studies for uranium and thorium ions from aqueous solution by novel microporous composite P(HEMA-EP)
Akkaya, Recep; Akkaya, Birnur (ELSEVIER SCIENCE BV, 2013)In this research, a novel composite, poly(2-hydroxyethylmethacrylate-expanded perlite) [P(HEMA-EP)], was synthesized and its adsorptive features were investigated. P(HEMA-EP)'s adsorptive features were evaluated for UO22+ ... -
Bentonite-acrylamide-histidine-Cu(II) Microcomposite for Cytochrome c Adsorption
Akkaya, Birnur; Akkaya, Recep (ISMITHERS, 2012)Bentonite-acrylamide-histidine with an average particle diameter of 200-1000 mu m was produced by bulk polymerization of bentonite, acrylamide, bisacrylamide, AIBN and histidine. Bentonite-acrylamide-histidine-Cu(II) ... -
Characterization of thermostable beta-amylase isozymes from Lactobacillus fermentum
Kocabay, Samet; Cetinkaya, Serap; Akkaya, Birnur; Yenidunya, Ali Fazil (ELSEVIER SCIENCE BV, 2016)A strain of Lactobacillus fermentum producing two isozymes of a 20 kDa beta-amylase was isolated from the faecal sample of a newborn. The starin was identified by sequencing its 16S rRNA gene. The two beta-amylase isozymes ... -
Chemical and biological characterization of sulfated chitosan oligomer as heparin mimics
Akkaya, Birnur; Kocabay, Samet; Bahar, Mehmet Refik; Tekin, Suat; Akkaya, Recep (Polymers and Polymer Composites, November 2)- -
Concanavalin a immobilized magnetic poly(glycidyl methacrylate) beads for antibody purification
Akkaya, Birnur; Yavuz, Handan; Candan, Ferda; Denizli, Adil (WILEY-BLACKWELL, 2012)Concanavalin A (Con A) immobilized magnetic poly(glycidyl methacrylate) (mPGMA) beads in monosize and spherical for (1.62 mu m in diameter) were used for the purification of human immunoglobulin G (IgG) from human plasma. ... -
Concanavalin a Immobilized Monosize and Magnetic Poly(glycidyl Methacrylate) Beads for Use in Yeast Invertase Adsorption
Akkaya, Birnur; Uzun, Lokman; Altintas, Evrim Banu; Candan, Ferda; Denizli, Adil (TAYLOR & FRANCIS INC, 2009)Concanavalin A (Con A) immobilized monosize and magnetic poly(glycidyl methacrylate)[m-poly(GMA)] beads were investigated for specific adsorption of yeast invertase from aqueous solutions. m-Poly(GMA) beads (1.6 m in ... -
Cross-Linked Bentonite-Acrylamide-histidine-Based Metal-Chelate Affinity Microcomposites for Lysozyme Separation From Egg White
Akkaya, Birnur; Akkaya, Recep (TAYLOR & FRANCIS INC, 2012)Among different adsorbents, a new support for immobilized metal affinity chromatography was used for lysozyme separation from egg white. For this purpose, acrylamide, bisacrylamide, bentonite, and L-histidine in the presence ... -
A Crosslinked Carboxylic Acid Containing Cation Exchange Monolithic Cryogel for Human Serum Albumin Separation
Akkaya, Birnur; Akkaya, Recep (TAYLOR & FRANCIS INC, 2012)For this work, we synthesized poly(N-isopropylacrylamide-acrylamide)-acrylic acid (poly(NIPAM-Am)-AAc) monolithic cryogel for a human serum albumin separation (HSA) from a protein mixture (human serum immunoglobulin, human ... -
IgG purification by bentonite-acrylamide-histidine microcomposite
Akkaya, Birnur (ELSEVIER SCIENCE BV, 2012)In this work, a new microcomposite composed of bentonite, acrylamide and histidine, as a pseudospecific ligand, was synthesized by bulk polymerization. The aim of this study was to improve IgG adsorption capacity of bentonite ... -
Mercury leads to abnormal red blood cell adhesion to laminin mediated by membrane sulfatides
Akkaya, Birnur; Kucukal, Erdem; Little, Jane A.; Gurkan, Umut A. (ELSEVIER SCIENCE BV, 2019)Exposure to mercury is associated with numerous health problems, affecting different parts of the human body, including the nervous and cardiovascular systems in adults and children; however, the underlying mechanisms are ... -
N-methacryloyl-(L)-histidine methyl ester carrying porous magnetic beads for metal chelate adsorption of cytochrome c
Akkaya, Birnur; Uzun, Lokman; Candan, Ferda; Denizli, Adil (ELSEVIER SCIENCE BV, 2007)A magnetic metal-chelate adsorbent utilizing N-methacryloyl-(L)-histidine methyl ester (MAH) as a metal-chelating ligand was prepared. MAH was synthesized using methacryloyl chloride and L-histidine methyl ester. Magnetic ... -
New low-cost composite adsorbent synthesis and characterization
Akkaya, Recep; Akkaya, Birnur (TAYLOR & FRANCIS INC, 2013)In this research, a novel composite, poly(acrylamide-expanded perlite) [P(AAm-EP)], was synthesized and characterized. The chemical synthesis was achieved by using free-radical polymerization and a number of structural ... -
Porous and spherical hydroxyapatite microcomposites for immunoglobulin G adsorption
Akkaya, Birnur (WILEY, 2013)A novel porous and spherical hydroxyapatite (HA) microcomposite with an average diameter of 50-100 m was produced by suspension polymerization for the adsorption of human immunoglobulin G (IgG). The specific surface area ... -
Preparation and characterization of lysozyme loaded cryogel for heavy metal removal
Akkaya, Birnur (International Journal of Biological Macromolecules, 2023)In the present study, monolithic poly(N-isopropylacrylamide-acrylamide)-acrilic acid (poly(npam-aam)-aac) cryogels were made. Swelling tests, SEM, XRD, and ATR-FTIR analyses revealed distinct cryogel and lysozyme-loaded ... -
Production and immobilization of a novel thermoalkalophilic extracellular amylase from bacilli isolate
Akkaya, Birnur; Yenidunya, Ali Fazil; Akkaya, Recep (ELSEVIER SCIENCE BV, 2012)A Thermoalkalophilic amylase was produced from an environmental bacterial isolate. The enzyme was then immobilized through its amino groups onto the epoxy rings of magnetic poly glycidyl methacrylate [m-poly (GMA)] beads. ... -
Production, purification, and characterization of metalloprotease from Candida kefyr 41 PSB
Yavuz, Sevgi; Kocabay, Samet; Cetinkaya, Serap; Akkaya, Birnur; Akkaya, Recep; Yenidunya, Ali Fazil; Bakici, Mustafa Zahir (ELSEVIER SCIENCE BV, 2017)A thermostable metalloprotease, produced from an environmental strain of Candida kefyr 41 PSB, was purified 16 fold with a 60% yield by cold ethanol precipitation and affinity chromatography (bentoniteacrylamide-cysteine ... -
Properties of an extracellular lipase from a traditional yoghurt yeast
Akkaya, Birnur; Yenidunya, Ali Fazil (WALTER DE GRUYTER GMBH, 2012)Purpose: To produce an organic solvent tolerant extracellular lipase from a traditional yoghurt Saccharomyces cerevisiae isolate and to characterize this enzyme activity. Material and Methods: A traditional yoghurt sample ... -
Selective and single step adsorption of a-lactalbumin from whole cow's milk on hydroxyapatite microbeads
Cetinkaya, Serap; Akkaya, Birnur (ELSEVIER SCIENCE BV, 2016)In this study, newly modified hydroxyapatite microbeads were used to isolate alpha-lactalbumin (alpha-LA) from cow's milk by a single step. Inorganic material, pure hydroxyapatite was embedded in ethylene glycol dimethacrylate ... -
Separation of lysozyme with magnetically stabilized spherical hydroxyapatite microcomposites in a continuous flow system
Akkaya, Birnur (WILEY-BLACKWELL, 2013)The aim of this study was to produce a spherical and magnetic hydroxyapatite (HA) microcomposite to use as an adsorbent for the separation of lysozyme in a magnetically stabilized fluidized bed and to separate lysozyme ...