Food Engineering / Gıda Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/12

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Institution Author: search.filters.institutionAuthor.Ceylan, ÇağataySubject: search.filters.subject.Atomic force microscopy

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  • Article
    Citation - WoS: 12
    Citation - Scopus: 16
    Humidity Adsorption Kinetics of a Trypsin Gel Film
    (Elsevier Ltd., 2012) Okur, Salih; Ceylan, Çağatay; Çulcular, Evren
    This study focuses on the humidity adsorption kinetics of an isopropanol-induced and pH-triggered bovine pancreatic trypsin gel (BPTG). The BPTG was adsorbed on a gold coated Quartz Crystal Microbalance (QCM) substrate with a thickness of 376nm. The morphology of the film was characterized using Atomic Force Microscopy (AFM). QCM was used to investigate the humidity sensing properties of the BPTG film. The response of the humidity sensor was explained using the Langmuir model. The average values of adsorption and desorption rates between 11% RH (relative humidity) and 97% RH were calculated as 2482.5M -1s -1 and 0.02s -1, respectively. The equilibrium constant and average Gibbs Free Energy of humidity adsorption and desorption cycles were obtained as 133,000 and -11.8kJ/mol, respectively. © 2011 Elsevier Inc..
  • Article
    Citation - WoS: 3
    Citation - Scopus: 3
    Evaluation of High Hydrostatic Pressure Effects on Bovine Red Blood Cells and Platelets
    (Taylor and Francis Ltd., 2009) Ceylan, Çağatay; Severcan, Mete; Bozoğlu, Faruk; Severcan, Feride
    The objective of this study was to investigate the effects of high hydrostatic pressure (HHP) on the stability of red blood cells (RBCs) and platelets. Bovine blood cells (n=5) were treated with the pressure of 55, 110, 154 and 220MPa at 25°C for 5min. Light microscopy, atomic force microscopy and flow cytometry studies revealed that RBCs were morphologically stable up until the 220MPa pressure treatments, at which surface modifications were observed. The platelets were found to be less stable than RBCs. HHP application did not cause any significant change in the signal intensity, band area and frequency values of the infrared bands with the exception that a significant variation was observed in the area of the cholesterol band. No statistically significant variations were observed in the secondary structure elements due to HHP treatment according to the artificial neural network study based on the FTIR data.