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Öğe Application of multivariate chemometric techniques for simultaneous determination of five parameters of cottonseed oil by single bounce attenuated total reflectance Fourier transform infrared spectroscopy(Elsevier, 2014) Talpur, M. Younis; Kara, Huseyin; Sherazi, S. T. H.; Ayyildiz, H. Filiz; Topkafa, Mustafa; Arslan, Fatma Nur; Naz, SabaSingle bounce attenuated total reflectance (SB-ATR) Fourier transform infrared (FTIR) spectroscopy in conjunction with chemometrics was used for accurate determination of free fatty acid (FFA), peroxide value (PV), iodine value (IV), conjugated diene (CD) and conjugated triene (CT) of cottonseed oil (CSO) during potato chips frying. Partial least square (PLS), stepwise multiple linear regression (SMLR), principal component regression (PCR) and simple Beer's law (SBL) were applied to develop the calibrations for simultaneous evaluation of five stated parameters of cottonseed oil (CSO) during frying of French frozen potato chips at 170 degrees C. Good regression coefficients (R-2) were achieved for FFA, PV, IV, CD and CT with value of > 0.992 by PLS, SMLR, PCR, and SBL. Root mean square error of prediction (RMSEP) was found to be less than 1.95% for all determinations. Result of the study indicated that SB-ATR FTIR in combination with multivariate chemometrics could be used for accurate and simultaneous determination of different parameters during the frying process without using any toxic organic solvent. (C) 2014 Elsevier B.V. All rights reserved.Öğe A Chemometric Approach to Assess the Frying Stability of Cottonseed Oil Blends During Deep-Frying Process: I. Polar and Polymeric Compound Analyses(Wiley, 2013) Arslan, Fatma Nur; Kara, Huseyin; Ayyildiz, Hamide Filiz; Topkafa, Mustafa; Tarhan, Ismail; Kenar, AdnanThe main goal of the present study was (i) to determine the formation of degradation products in cottonseed oil (CSO) blends during deep frying process by adsorption and high performance size exclusion chromatography techniques and (ii) to evaluate the impacts of food additives on total polar (TPC) and polymeric compound (PTAG) formation using a chemometric approach. In order to prepare the frying CSO blends; ascorbic palmitate, mixed tocopherols, dimethylpolysiloxane, lecithin and sesame oils were used as additives. To determine the real impacts of additives, a quarter-fraction factorial experimental design with two levels and five factors was used. The changes in TPC and PTAG data were carefully evaluated during 10 h of frying at 170 +/- A 5 A degrees C with normal distribution (ND) graphs and analyzed using a one-way analysis of variance (ANOVA), followed by Tukey's Post-hoc test (alpha = 0.05). The results indicated that the increasing values for TPC and PTAG during the frying processes for all blends, TPC and PTAG contents reached maximum levels of 16.37 and 6.01 % respectively, which are below the limit values stated by official authorities for the quality assessment of frying oils. The ANOVA test results were in good agreement with ND graphs and data indicated that the impact of mixed tocopherols was significant for TPC formation, meanwhile the impact of lecithin and ascorbic palmitate x dimethylpolysiloxane were significant for PTAG formation. Thus, the present study should be considered to be a very useful guide for developing new frying oil formulations based on CSO by using food additives.Öğe Fully Automated Three-Dimensional Column-Switching SPE-FIA-HPLC System for the Characterization of Lipids by a Single Injection: Part I. Instrumental Design and Chemometric Approach to Assess the Effect of Experimental Settings on the Response of ELSD(Springer, 2016) Arslan, Fatma Nur; Kara, HuseyinThis article presents the first application of fully automated three-dimensional (3D) column-switching SPE-FIA-HPLC system for the characterization of lipids by a single injection. The whole system was designed and set up by modifying Agilent 1200 Series HPLC system in our laboratory. By using this system, a complete separation profile of the oil samples was achieved in a very short time period by using single injections. This approach was applied on vegetable oils which contains a large number of relatively high-class lipid components, such as TG, FFA, sterols, tocopherols, DG, ester and MG. In this part of the study, we focused on the optimization of evaporative light scattering detector (ELSD) by using an experimental design and RSM. Three experimental parameters were chosen as an independent variables which are the flow rate of mobile phase, nebulization temperature and evaporation temperature. A multivariate five level experimental design was used to establish a quadratic model as a functional relationship between the response values and independent variables. The optimal values of parameters were found to be a flow rate of 1.25 mL min(-1), nebulization temperature of 80 degrees C, and evaporation temperature of 40 degrees C. Regression analysis with an R-2 values indicated as a satisfactory correlation between the experimental and predicted values. ANOVA test results were also illustrate that the models can be successfully used to predict the optimum parameters of ELSD. Thus, the proposed system is suitable for a large number of applications including research and development of new quality control and characterization methods for vegetable oils.Öğe Naked-eye colorimetric and switch-on fluorescence chemosensor based on a rhodamine derivative for Hg2+: Smartphone device, test-kit and food sample applications(Elsevier Science Sa, 2023) Genc, Hayriye Nevin; Yasar, Ozlem Guctekin; Elmas, Sukriye Nihan Karuk; Arslan, Fatma Nur; Yilmaz, Ibrahim; Sirit, AbdulkadirA new rhodamine-based switch-on fluorescent and colorimetric chemosensor (RHEN) was fabricated for the determination of Hg2+. The RHEN showed a noticeable colorimetric response for Hg2+ from colorless to pink under daylight. When exposed to Hg2+, the fluorescence at 582 nm from the probe RHEN was remarkably enhanced, attend by a color change from colorless to dusty rose color under 365 nm UV lamp. The RHEN had a notable specificity and selectivity for Hg2+ and depicted an excellent sensing performance for detecting lowly concentrated Hg2+ (LOD; 0.11 mu M). The binding phenomenon between RHEN and Hg2+ was identified by Job's method, MALDI TOF-MS and FT-IR spectroscopy. Moreover, the fabricated chemoprobe RHEN was not only utilized to identify Hg2+ in fish samples with satisfactory results (95.28-111.66 %) but also was successfully used for test-paper and cotton swab applications. Smartphone application also showed that RHEN could be used as a potent tool for on-site sensing of Hg2+ without the need for complicated device.Öğe A tetraoxacalix[2]arene[2]triazine based fluorogenic probe for the sensing of Fe3+: Computational and living-cell imaging applications(Elsevier Science Sa, 2020) Karuk Elmas, Sukriye Nihan; Gunay, Ibrahim Berk; Genc, Hayriye Nevin; Aydin, Duygu; Arslan, Fatma Nur; Sadi, Gokhan; Sirit, AbdulkadirHerein, we have reported a feasibility study of highly selective and sensitive fluorogenic chemosensor (probe TOCT) derived from tetraoxacalix [2] arene [2] triazine for Fe3+ sensing in aqueous media. The probe TOCT has been fabricated and verified by H-1-NMR, HR-LCMS,FT-IRand C-13-NMR. The sensing properties of probe TOCT toward various metal ions were confirmed by fluorescence titration study as well as competitive study. The intensity of probe TOCT reduced with the amount of Fe3+ when it was excited at 300 nm in CH3CN:H2O (95/5, v/v, pH = 7) media. The probe demonstrated a 'turn-off' response toward Fe3+, in the presence of possible competing ions. The detection limit value of probe TOCT for Fe3+ sensing was computed to be 12.5 nM. The possible molecular structure of complex between probe TOCT and Fe3+ was also proposed on the basis of HR-LCMS and FT-IR. The stoichiometry of TOCT-Fe3+ complex was identified to be 1:1 to the methodology of Job's plot. The binding ability was studied through the equation of Benesi-Hildebrand which was computed to be 8.90 x 10(4) M-1 for Fe3+. To support the intensity enhancement and quenching studies, we reported computational experiments based on the density functional theory (DFT). Moreover, a great potential has been detected for probe TOCT as a fluorescent chemosensor in biological applications to monitor Fe3+ in living cells.