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    Development of a New Methodology for Determination of Vitamin B9 at Trace Levels by Ultrasonic-Assisted Cloud Point Extraction Prior to HPLC
    (Springer, 2017) Ulusoy, Halil Ibrahim; Acidereli, Hilal; Ulusoy, Songul; Erdogan, Selim
    A new analytic methodology based on ultrasonic-assisted cloud point extraction coupled with high-performance liquid chromatography (UA-CPE-HPLC) was developed and successfully applied to determine vitamin B9 in food samples. Polyethylene glycol 6000 (PEG-6000) was used as nonionic surfactant due to its chemical properties and trade availability. All parameters such as surfactant concentration, ionic strength, and the other conditions were also investigated and optimized. The optimal conditions for UA-CPE method were presented with 2.4 % w/v PEG-6000, 14.6 % w/v Na2SO4, and ultrasonic heating assistance at 40 A degrees C for 20 min. The calibration curve for vitamin B9 was linear ranging from 20 to 800 mu g L-1, with correlation coefficients being 0.9944 determined by a HPLC-diode array detector (DAD) detector. Relative standard deviation for 150 mu g L-1 was calculated as 2.87 %. Recovery values in different concentration levels were in the range of 95.6-104.2 %. The obtained results demonstrate that the proposed method can be applied for determination of vitamin B9 in real samples.
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    A new approach to the determination of folic acid at trace levels: using a Fe(III)-folic acid complex to amplify analytical signal
    (Royal Soc Chemistry, 2016) Ulusoy, Songul; Acidereli, Hilal; Erdogan, Selim; Ulusoy, Halil Ibrahim
    A fast, efficient, cost-effective, and environmental-friendly analytical methodology was developed for preconcentration and determination of trace folic acid in food samples prior to high performance liquid chromatography with diode array detection (HPLC-DAD). The method is based on formation of stable complexes between folic acid and Fe(III) ions at pH 8.0. The formed complexes were extracted to a nonionic surfactant phase containing PONPE 7.5. The surfactant rich phase (SRP) was separated by decantation and diluted with 300 mu L of a mixture of 1 M HCl and methanol at a 1 : 1 ratio. The parameters and variables that affected the method were also investigated and optimized in detail. The limit of detection (LOD) of folic acid was 6.06 ng mL(-1), the linear range of quantitation for folic acid was 20-1200 ng mL(-1) and the correlation coefficients of the calibration curves were 0.9976. The average recoveries and relative standard deviations in the analysis of real samples were in the range of 95.1-105.1% and 1.73-5.25%, respectively. After validation of the method was carried out, the method was applied to the determination of folic acid in real samples, including baby foods, vegetables, cereals, and pharmaceutical samples.
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    Pharmacokinetic Profiles of Metamizole Metabolites after Intramuscular and Intravenous Administration in Healthy Arabian Horses
    (Wiley, 2021) Yilmaz, Ismet; Maras, Zeynep; Ozgur, Mustafa Erkan; Durmaz, Murat; Ulusoy, Halil Ibrahim; Erdogan, Selim; Ugur, Yilmaz
    Metamizole sodium (MT) is an analgesic and antipyretic drug molecule used in humans, horses, cattle, swine, and dogs. Metamizole rapidly hydrolyzes and turns into methylamino antipyrine (MAA), an active primary metabolite of MT. The present study aims to determine the pharmacokinetic (PK) profiles of MT metabolites after intravenous (IV) and intramuscular (IM) administration into sex of Arabian horses (Equus ferus caballus) using a cross-over study design. The plasma samples were extracted by solid-phase extraction (SPE) method, and plasma concentrations of MT metabolites were analyzed by high-performance liquid chromatography (HPLC). After administrations of MT, plasma concentrations of methylamino antipyrine (MAA), amino antipyrone (AA), and acetylamino antipyrone (AAA) were determined within range of 15 min-12 h. Plasma concentrations of AA and AAA were lower than the plasma concentrations of major metabolite MAA at each sampling point. The PK parameters were statistically evaluated for MT's metabolites between male and female horses and also between IM and IV administrations of PK parameters such as C-max, t(max), t(1/2 lambda z), AUC(0-t), AUC(0-infinity), lambda z, Cl and V-ss (p < .05). The AUC(IM)/AUC(IV) ratio in female and male horses for MAA was 1.19 and 1.13, respectively. The AUC(IM)/AUC(IV) ratio for AA was lower than those found for MAA. AUC(IM)/AUC(IV) ratio was statistically significantly different between male and female horses for AA (p < .05). According to these results, some PK parameters such as Cmax, AUC, and MRT, MAA and AA concentrations have shown statistically significant differences by MT administrations.
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    The Presence of Polycyclic Aromatic Hydrocarbons (PAHs) in Grilled Beef, Chicken and Fish by Considering Dietary Exposure and Risk Assessment
    (Korean Soc Food Science Animal Resources, 2020) Sahin, Seyda; Ulusoy, Halil Ibrahim; Alemdar, Suleyman; Erdogan, Selim; Agaoglu, Sema
    Polycyclic aromatic hydrocarbons (PAHs) are dangerous chemical compounds that can be formed by cooking foods at high temperatures. The aim of this study is to determine the level of contamination of PAH compounds with high performance liquid chromatography (HPLC) on heat treated meat samples and the consumption of PAH compounds in meat samples, as well as the dietary exposure status and possible health risk estimation. In five different heat treated meat samples (meat doner, chicken doner, meatballs, grilled chicken, and fish), the total PAH (Sigma 16PAH) contamination level was 6.08, 4.42, 4.45, 4.91, and 7.26 mu g/kg, respectively. Benzo[a]pyrene (BaP) in meatballs and grilled fish samples had a level 0.70 and 0.73 mu g/kg. All of the samples analyzed were found to be below the EU permitted limit (5 mu g/kg) in terms of BaP. Estimates of daily intake (EDI) for a total of 16PAH in heat treated meat doner, chicken doner, meatballs, grilled chicken and fish samples were 3.41, 3.71, 2.49, 4.12, and 1.77 mu g/kg bw/day, respectively. In this study, the average margin of exposure (MOE) value calculated was found in the range of 179.487 and 425.000 for BaP and PAH4. This study is the first study to provide important information in terms of evaluating the possible health risk that PAH compounds can create in people's diets due to heat treatment of meat and meat products in Sivas, Turkey.