Gıda İşleme Bölümü
Food processing
https://hdl.handle.net/11491/3242
2024-03-29T12:20:29Z
2024-03-29T12:20:29Z
The Activity and Reproductive Pattern of Testudo graeca in Cappadocia Region, Anatolia
Arslan Akveran, Gönül
https://hdl.handle.net/11491/6608
2024-01-23T08:52:02Z
2017-01-01T00:00:00Z
The Activity and Reproductive Pattern of Testudo graeca in Cappadocia Region, Anatolia
Arslan Akveran, Gönül
[Abstract Not Available]
2017-01-01T00:00:00Z
Effect of immobilization on the activity of catalase carried by poly(HEMA-GMA) cryogels
Erol, Kadir
Koncuk Cebeci, Büşra
Köse, Kazım
Köse, Dursun Ali
https://hdl.handle.net/11491/6379
2022-01-07T13:49:03Z
2019-01-01T00:00:00Z
Effect of immobilization on the activity of catalase carried by poly(HEMA-GMA) cryogels
Erol, Kadir; Koncuk Cebeci, Büşra; Köse, Kazım; Köse, Dursun Ali
Hydrogen peroxide is converted by catalase to molecular oxygen and water to remove oxidative stress. In this study, catalase immobilization was performed using poly(2-hydroxyethyl methacrylate-glycidyl methacrylate) (poly(HEMA-GMA)) cryogels with different amounts of GMA. Catalase adsorption capacity of 298.7 ± 9.9 mg/g was achieved at the end of 9 h using the poly(HEMA-GMA)-250 cryogel. Kinetic parameters and the inhibitory effects of pesticides such as 4,4?-DDE and 4,4?-DDT on the activity of free and immobilized catalase enzyme were investigated. While the V max value of the immobilized enzyme was reduced 4-fold compared to the free enzyme, in the case of the comparison of the K M values, the affinity of the immobilized enzyme was increased by 1.94 times against the substrate. The inhibitory effect of 4,4?-DDT pesticide was found to be higher for the immobilized and free enzyme. NaCl (1 M, pH: 7.0) solution was used for desorption of the adsorbed catalase enzyme. A desorption ratio of 96.45% was achieved. The technique used in this study is promising regarding for the immobilization of catalase enzyme to increase the operational activity. Therefore, poly(HEMA-GMA) cryogels have the potential to be used for immobilization of catalase enzyme in the fields of biology and biochemistry. © 2018 Elsevier B.V.
2019-01-01T00:00:00Z
Lead removal from industrial waste
Bilgin, Elif
Yüce, Murat
Köse, Kazım
Erol, Kadir
Köse, Dursun Ali
https://hdl.handle.net/11491/3228
2021-10-30T20:22:40Z
2017-01-01T00:00:00Z
Lead removal from industrial waste
Bilgin, Elif; Yüce, Murat; Köse, Kazım; Erol, Kadir; Köse, Dursun Ali
In this study, the heavy metal removal performance of poly(2-hydroxyethyl methacrylate-N-methacryloyl-(L)-histidine methyl ester), poly(HEMA-MAH) cryogel, a known polymer, in HNO3 was investigated. To determine the heavy metal removal performance of cryogel, wastewater was used as obtained from an inorganic material manufacturer. The characterization studies using scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, elemental analysis, waterswelling tests and surface area analysis were conducted. The effect of HNO3 on the adsorption process, especially for metals, was found very effective even in trace amounts.
research
2017-01-01T00:00:00Z
Nicotinamide-modified poly(HEMA-GMA)-Nic cryogels for removal of pesticides
Köse, Kazım
Arslan Akveran, Gönül
Erol, Kadir
Köse, Dursun Ali
https://hdl.handle.net/11491/1839
2021-10-30T20:36:45Z
2018-01-01T00:00:00Z
Nicotinamide-modified poly(HEMA-GMA)-Nic cryogels for removal of pesticides
Köse, Kazım; Arslan Akveran, Gönül; Erol, Kadir; Köse, Dursun Ali
Chlordane is only one of the persistent pesticides used in some countries despite the ban. Removal of chlordane, a severe threat to all living things, was performed using nicotinamide-modified poly (2-hydroxyethyl methacrylate-glycidyl methacrylate), poly(HEMA-GMA)-Nic, polymeric cryogels in this study. Poly(HEMA-GMA) polymeric cryogels were synthesized based on previously reported literature procedures and were subsequently modified by nicotinamide moieties. Removal of chlordane in alcoholic medium has been accomplished exploiting the alcoho-phobic interaction, which was the first indication in our previous study. Structural analysis of poly(HEMA-GMA)-Nic was performed using Fourier transform infrared spectroscopy (FT-IR) and elemental analysis methods. Scanning electron microscopy (SEM) was used to understand the surface morphology of cryogels. Surface area and cavity volume calculations were determined by applying N 2 adsorption method and swelling test. The interaction time and maximum adsorption capacity were identified as 5 minutes and 64.61 mg chlordane/g cryogel for 300 mg/L chlordane concentration and 108.818 mg chlordane/g cryogel for 800 mg/L chlordane concentration during the adsorption experiments. Cyclohexane, toluene, chloroform, dichloromethane, acetone, and acetonitrile were used as solvents to observe the solvent effect on adsorption of chlordane onto the polymeric material. As expected, the removal of chlordane was performed with the highest adsorption performance in cyclohexane with the lowest dielectric constant. © 2018, Turkish Chemical Society. All rights reserved.
2018-01-01T00:00:00Z