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    Effect of blends of camel chymosin and microbial rennet (Rhizomucor miehei) on chemical composition, proteolysis and residual coagulant activity in Iranian Ultrafiltered White cheese
    (Springer India, 2019) Soltani, Mostafa; Sahingil, Didem; Gokce, Yasemin; Hayaloglu, Ali A.
    Iranian Ultrafiltered White cheese was produced by using different blends of coagulants (100:0, 75:25, 50:50, 25:75 and 0:100; Rhizomucor miehei and camel chymosin, respectively) and ripened for 90days. The effect of different combinations of these coagulants on chemical composition, proteolysis and residual coagulant activity of the cheeses were studied. The results showed that pH, fat-in-dry matter, salt-in-dry matter and protein contents of the cheeses were significantly influenced by type and concentration of the coagulants. The difference between proteolytic activities of the two coagulants resulted in different levels of proteolysis in the cheeses. A direct relationship was determined between using higher concentrations of R. miehei and increasing the hydrolysis of (s1)-casein in the cheeses, during ripening. The residual coagulant activity was influenced by the type and concentration of the coagulant as well. In conclusion, R. miehei provided a higher level of proteolysis and residual coagulant activity compared with camel chymosin.
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    Imidazolidinium ferrate complexes: Synthesis and catalytic properties
    (Elsevier France-Editions Scientifiques Medicales Elsevier, 2014) Demir, Serpil; Gokce, Yasemin; Roisnel, Thierry; Sortais, Jean-Baptiste; Darcel, Christophe; Ozdemir, Ismail
    The new well-defined and air stable anionic iron complexes bearing an imidazolidinium ligand (2a-d) have been synthesized and characterized by elemental analysis and single-crystal X-ray diffraction studies. Starting from FeBr2, [imidazolidinium][FeBr4] complexes 2a and 2b were prepared. The reaction of imidazolidinium chlorides with Fe(OAc)(2), followed by a recrystallization in the air led to bis(imidazolidinium) mu-oxido-bis[trichloroferrate(III)] complexes 2c and 2d. The catalytic activity of these novel complexes has been evaluated in the cross-coupling reactions of alkyl halides with Grignard reagents. (C) 2014 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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    Influence of using different ratios of small ruminants (ovine and caprine) milk on compositional and proteolytic changes during ripening of raw milk lighvan cheese
    (Elsevier Sci Ltd, 2024) Soltani, Mostafa; Saremnezhad, Solmaz; Kanmaz, Hilal; Tekin, Ali; Gokce, Yasemin; Kaya, Busra; Sahingil, Didem
    Lighvan cheese was manufactured using different ratios of ovine and caprine milk (100:0, 75:25, 50:50, 25:75, 0:100) and ripened for 90 days. Chemical composition, proteolysis level, total and individual levels of free amino acids, texture and residual coagulant activity were analysed during ripening. Significant decreases in pH and moisture content and significant increases in texture parameters, residual coagulant activity, soluble nitrogen fractions, fat, and protein contents were determined in the cheese manufactured using higher ratios of ovine milk (P <0.05). Differences in gel electrophoresis and RP-HPLC peptide profiles of the cheeses were seen. Leu and Phe were detected as predominant free amino acids in the cheeses during ripening. In conclusion, besides the cheese manufactured using ovine milk alone, the lighvan cheeses made with ovine and caprine milk in the ratios of 75:25 and 50:50 can be introduced as the preferred cheeses because of having proper proteolysis indices and semi-hard texture. (c) 2023 Elsevier Ltd. All rights reserved.
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    Synthesis of new iron-NHC complexes as catalysts for hydrosilylation reactions
    (Wiley, 2013) Demir, Serpil; Gokce, Yasemin; Kaloglu, Nazan; Sortais, Jean-Baptiste; Darcel, Christophe; Ozdemir, Ismail
    A series of new piano-stool iron(II) complexes comprising N-heterocyclic carbene ligands [Fe(Cp)(CO)2(NHC)]I (NHC = 1,3-disubstituted imidazolidin-2-ylidene) have been synthesized and analyzed by 1H NMR, 13C NMR, IR, elemental analysis and mass spectrometric techniques. These compounds were easily prepared from the reaction of disubstituted imidazolidin-2-ylidene with [FeI(Cp)(CO)2] in toluene at room temperature. These complexes were tested in the catalytic hydrosilylation reaction of aldehydes and ketones with phenylsilane in solvent-free conditions. After a basic hydrolysis step, the corresponding alcohols were obtained in good yields. Copyright (c) 2013 John Wiley & Sons, Ltd.