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    Fabrication and application of a new modified electrochemical sensor using newly synthesized calixarene-grafted MWCNTs for simultaneous determination of Cu(II) and Pb(II)
    (SLOVENSKO KEMIJSKO DRUSTVO, 2019) Kucukkolbasi, Semahat.; Sayin, Serkan.; Yilmaz, Mustafa.
    A rapid, simple, selective and highly sensitive simultaneous determination of Cu(II) and Pb(II) via newly fashioned 5,11,17,23-tetra-tert-butyl-25,27-dihydrazinamidecarb onylmethoxy-26,28- dihydroxycalix [4] arene-grafted multi-walled carbon nanotubes-modified carbon paste electrode (CNT-Calix/CPE) by differential pulse anodic stripping voltammetry (DPASV) has been introduced. It was observed that CNT-Calix/CPE exhibits higher selectivity and stability for Cu(II) and Pb(II). Different operational parameters such as pH, deposition potential/time, pulse amplitude (5, -1.0 V vs. Ag/AgCl, 300 s, 2 s, 0.05 V) were also optimized for calculation and statistical evaluation of linear range, detection limit and limit of quantification. Interference study shows that the electrode is highly selective for the simultaneous determination of Cu(II) and Pb(II). Standard addition method was used to apply CNT-Calix/CPE in waste water, plant leaves and soft drinks and it was found that the concentration of Cu(II) and Pb(II) were corresponding to standardized values.
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    Functional group efects of new calixarene derivatives on catalytic and enantioselective behavior of lipase
    (TAYLOR & FRANCIS LTD, 2019) Dogan, Vildan.; Sayin, Serkan.; Uyanik, Arzu.; Yilmaz, Mustafa.
    In this study, two new calixarene derivatives bearing thiourea and carbamate moieties were synthesized and characterized. Moreover, thiourea- and carbamate-bridged calixarene derivatives with Fe3O4 magnetic nanoparticle were employed for the first time as the convenient additives in the encapsulation process of lipase. The results of catalytic activity and enantioselectivity of the encapsulated lipases in the hydrolysis reaction of racemic flurbiprofen methyl ester indicate that both of the encapsulated lipases (Enc-TuC[4]@Fe3O4 and Enc-CbC[4]@Fe3O4) exhibit higher conversion and enantioselectivity compared to the free-encapsulated lipase (Enc-Lipase). However, the highest affinities result was obtained when the encapsulated lipase (Enc-CbC[4]@Fe3O4) was used in the kinetic resolution reaction of racemic flurbiprofen methyl ester.