Effect of hydrogenation conditions on rheological and micro-structural properties of fats

Download

index.pdf

Date

2011

Author

Başkoçak, Altuğ

Metadata

Show full item record

Item Usage Stats

145
views

76
downloads

Hydrogenation is one of the most applied techniques in the fats and oils industry to produce wide range of hardened fats with different physical and chemical properties. Each different combination of hydrogenation conditions serves products of different rheological and micro-structural properties. Therefore, the purpose of this study is to examine the effect of different industrially available catalysts on rheological and micro-structural properties of hydrogenated fats. Three different catalysts were used at two different concentrations to hydrogenate soybean oil. Two nickel based (Nysosel 222 and SP 10) and one palladium based (Pd/Al2O3) catalyst were employed. Each oil sample was hydrogenated for 20, 40, 60, 80 and 100 minutes of time intervals, under 165 ºC temperature, 2 bar H2 pressure and 500 rpm stirring rate. Resulting hardened fat samples were analysed in terms of rheological and microstructural properties. The outcomes of rheological and micro-structural analyses had a strong resemblence with the fatty acid distributions, solid fat contents, slip melting points and iodine values of the samples. The most selective catalyst was SP10, with the products of the highest trans fatty acid concent and more solid-like; where the least selective one was Pd/A with lowest trans fatty acid content and least solid-like. Crystal number and properties, the behaviours of storage and loss moduli were in correlation with trans fatty acid content of the samples. Also the moduli had a considerable parallelity with solid fat contents.

Subject Keywords

Lipids.

URI

http://etd.lib.metu.edu.tr/upload/12613587/index.pdf
https://hdl.handle.net/11511/21091

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Effects of Ingredients on Thermal and Mechanical Properties of Acrylic Bone Cements Endoğan Tanır, Tuğba; Hasırcı, Nesrin (2009-09-15) There is a very delicate relation between the amounts of all the ingredients present in the cement composition and the properties of the product. In this study, homogeneous poly(methyl methacrylate) (PMMA) microspheres were prepared by suspension polymerization technique, and used in cement formulations. Various acrylic cements with different compositions were prepared by using PMMA microspheres, methyl methacrylate (MMA) monomer, radiopaque agent of barium sulfate (BaSO4), inorganic particles of hydroxyapa...
Growth of microalgae Chlorella vulgaris at the photobioreactor for biodiesel production Ertürk, Handan; Sudagıdan, Mert; Yurdakul, Merve; Öktem, Hüseyin Avni (2018-03-01) Microalga is known to have higher lipid contents and biodiesel efficiency than most plant oil sources e.g. palm oil. We studied the growth of Chlorella vulgaris at the photobioreactor in our laboratory. We aimed to use this photobioreactor of laboratory scale as feed stream to an open pond larger scale bioreactor for future work. Photobioreactor had three compartments which had separate controls for light and air circulation. Temperature was kept at 22°C-26°C. The circulation rate was 180 L/h. The light int...
Effect of high hydrostatic pressure (HHP) on crystal structure of palm stearin emulsions Sevdın, Sezen; Yucel, Umut; Alpas, Hami (2017-08-01) High hydrostatic pressure (HHP) treatment was used to control the crystallization behavior of solid lipid nanoparticles stabilized with sodium caseinate (SC) and soy lecithin Phospholipon 80H (80H). Samples were pressurized at 100 and 500 MPa, at 10, 20 and 40 degrees C for 15 min. The stability of emulsions was analyzed by visual observation for gelation, and the change in the droplet size distribution using light scattering measurements after HHP treatment and storage for 28 days at 4 degrees C. The cryst...
Effect of Polymers on the Rheological Properties of KCl Polymer Type Drilling Fluid Kök, Mustafa Verşan (2005-05-01) In the course of this research, the effect of two polymers (xanthan gum and polyanionic cellulose) on the rheological properties of KCl/polymer type drilling fluids was investigated. Non-Newtonian drilling fluids are conventionally characterized by rheological models (Bingham Plastic, Power Law, Casson, Herchel-Bulkley and Robertson-Stiff). In this research, forty-five KCl/polymer data sets of varying compositions are prepared. Polymer addition to the system has affected the model and caused a variation of ...
Comparative effects of emodin on biological activities of MCF-7 and MDA-231 cell lines Sakallı, Elif; İşcan, Mesude; Department of Biochemistry (2010) Emodin (1,3,8-trihydroxy-6-methylanthraquinone) is a phytoestrogenic component of Rheum plant extracts which has been used for medical treatment since ancient times. It has been shown to have anti-inflammatory and anti-cancer effects. In our research, we aimed to study the biological effects of emodin on MCF-7 and MDA-231 cell lines. Cytotoxicity assays showed that emodin treatment for 48hours caused a concentration dependent decrease in viable cell numbers of both cell lines. As determined by cell counting...

Citation Formats

A. Başkoçak, “Effect of hydrogenation conditions on rheological and micro-structural properties of fats,” M.S. - Master of Science, Middle East Technical University, 2011.