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    Bioremoval of fast green FCF dye from aqueous solution using cranberry kernel (Cornus mas L.) as a lignocellulosic biowaste: equilibrium, kinetics, and mechanism
    (Taylor & Francis Ltd, 2023) Senol, Zeynep Mine; Keskin, Zehra Seba; Sarac, Kamuran; Simsek, Selcuk
    In this study, the biosorption properties of fast green FCF (FG) dye in an aqueous solution were investigated using cranberry (Cornus mas L.) kernel (CK) as lignocellulosic biowaste. The biosorbent performance of the cranberry (Cornus mas L.) kernel biomass for FG dye molecules was optimized: 500 mg L-1 at natural pH: 6.0 at 25 degrees C. The maximum biosorption capacity for CK biomass was found to be 21.6 mg g(-1) from the Langmuir isotherm model. Biosorption thermodynamics showed that FG dye biosorption to CK biomass was spontaneous, entropy-increasing, and endothermic. The kinetic data were described by the PSO and IPD kinetic models. Thermodynamic parameters were calculated, and it was seen that the biosorption process is spontaneous and endothermic. FT-IR spectrum after biosorption provided data supporting the formation of electrostatic interactions, n-pi interactions, and H-bonds between anionic FG dye molecules and CK biomass. When the results of this study were evaluated as a whole, it was concluded that CK biosorbent is a natural, abundant, low-cost, effective, and potential biosorbent for the removal of FG dye molecules from wastewater.
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    D-Glucose-fatty Acid Ester Synthesis with or without a Biocatalyst in the Same Organic Media
    (Japan Oil Chemists Soc, 2020) Cetinkaya, Serap; Yenidunya, Ali Fazil; Basoglu, Faika; Sarac, Kamuran
    Esterification of D-glucose with oleic- and palmitic acids were carried out in the absence and presence of a biocatalyst, Candida antarctica lipase. The reaction medium was a mixture of dimethyl sulphoxide and tert-butanol (1:4, v/v). The reaction products were analysed by FTIR, H-1-NMR and C-13-NMR, HSQC, and by ESI-MS. Results indicated that the ester products formed were 6-O-glucose oleate and 6-O-glucose palmitate both in the absence and in the presence of the biocatalyst, with yields above 90%.
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    Synthesis of Ribose - Oleic Acid Esters in the Presence- and Absence of Candida antarctica Lipase B
    (Japan Oil Chemists Soc, 2020) Cetinkaya, Serap; Yenidunya, Ali Fazil; Basoglu, Faika; Sarac, Kamuran
    D-ribose-oleic acid esters were produced with or without a biocatalyst, using in the same organic media. dimethyl sulfoxide (DMSO): tort-butanol (TBU) or 2-methyl-2-butanol (2M2B). The yield of the ester product was above 90% in both of the reactions. The biocatalyst used was lipase B of Candida antarctica. Molecular characterization was performed by using all the analytical methods available: IR, H-1-NMR and C-13-NMR, HSQC, and ESI-MS.