18 results on '"T. Teker"'
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2. The effect of nozzle orifice diameter on penetration depth and mechanical properties of AISI430/AISI1040 dissimilar steel joined by keyhole PTA welding process
- Author
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T. TEKER and N. ÖZDEMIR
- Subjects
Mechanics of Materials ,Mechanical Engineering ,Materials Chemistry ,Metals and Alloys - Published
- 2021
3. Weldability of AA6063 alloys by using Keyhole Gas Tungsten Arc Welding Technique
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T. TEKER and T. KURSUN
- Subjects
Mechanics of Materials ,Mechanical Engineering ,Materials Chemistry ,Metals and Alloys - Published
- 2021
4. Effects of extreme bud load and leaf removal treatments on leaf water potential, stomatal conductance and ripening of ‘Sultana’ (Vitis vinifera L.)
- Author
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T. Teker, O. Soltekin, A. Altindişli, and Ege Üniversitesi
- Subjects
Fruit quality ,Stomatal conductance ,Physiology ,Chemistry ,fungi ,food and beverages ,Grape ,Ripening ,Leaf water ,Crop ,Horticulture ,Stress ,Vitis vinifera - Abstract
This study was conducted to determine the effects of three different bud load levels (15 buds, 25 buds and 30 buds m-2) and two different leaf removal (25% and 50% on each vine shoot) treatments on number of bursted bud, midday leaf water potential (?mid), stomatal conductance (gs), total soluble solids (TSS) and titratable acidity (TA) of own-rooted ‘Sultana Seedless’ (Vitis vinifera L.) in 2016 and 2017 vegetation season in Alaşehir, Turkey. Vine spacing was 3.0 to 2.0 m and the vines were cane pruned on Y type trellis system. Leaf removal treatments were performed only once approximately one month before veraison. In this research, berries were sampled separately from upper and lower sides of the cluster. Then values were analyzed separately (P
- Published
- 2020
5. Deficit irrigation strategies in Vitis vinifera L. ‘Crimson Seedless’ table grape: Physiological responses, growth, yield and fruit quality
- Author
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A. Altindişli, O. Soltekin, T. Teker, and Ege Üniversitesi
- Subjects
Midday leaf water potential ,Water stress ,Deficit irrigation ,Table grape ,Stomatal conductance ,Horticulture ,Biology ,Physiological responses ,Grape quality ,Yield (wine) ,Berry composition ,Grapevine physiology ,Vitis vinifera - Abstract
The research was conducted in Viticultural Research Institute of Manisa located in Aegean Region of Turkey during 2016 and 2017 seasons. The objective of this study was determine the effects of water stress on yield parameters, berry quality, vine growth and physiology for 6 years old ‘Crimson Seedless’ table grape variety. Three different treatments were considered; namely full irrigation (FI), deficit irrigations (DI-65 and DI-35). In FI soil water deficit in the 90 cm within the seven-day intervals was replenished to the field capacity. DI-65 and DI-35 treatments received 65 and 35% of water applied to FI. All irrigation treatments were applied by sub-surface drip irrigation system. Vine water status was monitored through midday leaf water potential while soil moisture was monitored by MobiCheck probe before the irrigations. Results showed that water deficit treatments (DI-35 and DI-65) influenced berry composition positively. At harvest, deficit irrigation treatments had higher TSS, better CIRG index and uniform coloration compared with the FI treatment. When the ?md (midday leaf water potential) values were declined by DI treatments, it was observed that gs (stomatal conductance) values were decreased and stomatal closure occurs. On the other hand, FI treatment had the highest yield value in both two seasons. Therefore, water use is so important for the purpose of obtain higher yields from field grown grapevines under Aegean Region climatic conditions. Although DI-65 treatment received nearly 35% less water compared to the FI treatment, total yield was reduced approximately 9%. Additionally, berry composition (anthocyanin content, total phenolics, flavonoids and antioxidant capacity) values and coloration were found statistically better than the FI plots. Therefore, considering water shortages in dry years deficit irrigation practices -DI-65- can be recommended. © 2020 International Society for Horticultural Science. All rights reserved.
- Published
- 2020
6. Effect of the manual (GMAW) and pulsed (P-GMAW) welding processes on impact strength and fracture behavior of AISI 304-AISI 1040 dissimilar steel joints fabricated by ASP316L austenitic stainless steel filler metal
- Author
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T. Kurşun and T. Teker
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Filler metal ,Materials science ,Mechanical Engineering ,Metallurgy ,Metals and Alloys ,Izod impact strength test ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,Gas metal arc welding ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Mechanics of Materials ,Materials Chemistry ,Fracture (geology) ,engineering ,Composite material ,Austenitic stainless steel ,0210 nano-technology - Published
- 2017
7. SAT0618 Relationship between arterial stiffness and disease duration in behcet’s disease
- Author
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Koray Ayar, M.E. Aslanci, T. Teker, B. Sensoy, and S. Cekic
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medicine.medical_specialty ,business.industry ,Disease duration ,Behcet's disease ,Disease ,medicine.disease ,Subclinical atherosclerosis ,Internal medicine ,medicine.artery ,Diabetes mellitus ,medicine ,Arterial stiffness ,Cardiology ,Brachial artery ,business ,Pulse wave velocity - Abstract
Background There are few studies in the literature investigating arterial stiffness in Behcet’s Disease (BD). The association of arterial stiffness with duration of disease is unknown. Objectives The aim of this study is to compare arterial stiffness by assessing pulse wave velocity (PWV) and augmentation index (AI) measurements in healthy controls (HC) and patients diagnosed as BD with low and high disease duration. Methods Seventy BD patients and 40 HC without diabetes mellitus, Hipertension or chronic renal failure were included in the study. Patients with BD who were diagnosed within 12 months were taken to the group with low disease duration (LDD) and the others to the group with high disease duration (HDD). Demografic data and lipid parameters of all participants were recorded and PWV and AI measurements were made from brachial artery. The clinical charecteristics of the patients with BD were recorded and the Behcet’s Syndrome Activity Scale (BSAS) questionnaire was filled in for all patients with BD. Findings were compared between LDD, HDD and HC groups. Results Age, gender and body mass indexes were not statistically different between groups (p=0.134, p=0.948, p=0.929 respectively). Augmentation index and PWV measurements were different between groups (p=0.014, p=0.024 respectively). In the HDD group, both PWV and AI were significantly higher than HC (p=0.013, p=0.006 respectively). In LDD group AI was significantly higher than HC however PWV was not (p=0.047, p=0.919 respectively). There was moderate coralation between PWV and disease duration (Rho:0.393; p Conclusions The augmentation index is higher in patients with BD than HC regardless of the duration of the disease. Pulse wave velocity does not increase in the early period of the disease in patients with BD but increases with prolonged desease duration. References [1] Yilmaz S1, Celik G, Esmen SE. Assessment of arterial stiffness in patients with inactive and active Behcet’s disease. Scand J Rheumatol. 2014;43(1):63–9. doi:10.3109/03009742.2013.809787. Epub 2013 Sep 9 [2] Yildirim A1, Karakas MS2, Kilinc AY3, Altekin RE3, Yalcinkaya AS3. Evaluation of arterial stiffness and subclinical atherosclerosis in patients with Behcet’s disease without cardiovascular involvement. Turk Kardiyol Dern Ars2016;Oct;44(7):575–581. doi:10.5543/tkda.2016.06944 Disclosure of Interest None declared
- Published
- 2018
8. Study to evaluate the abrasive wear resistant behavior of materials coated with Fe-Cr-Si-C
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M. Yaz, Serdar Yilmaz, and T. Teker
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Materials science ,Mechanics of Materials ,Mechanical Engineering ,Abrasive ,Metallurgy ,Materials Chemistry ,Metals and Alloys ,Wear resistant ,Composite material - Published
- 2011
9. Investigation of antifungal activities of myrcene on Fusarium reference strains.
- Author
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Albayrak G, Yörük E, Teker T, and Sefer Ö
- Subjects
- Random Amplified Polymorphic DNA Technique, Retroelements, Antifungal Agents pharmacology, Antifungal Agents metabolism, Fusarium
- Abstract
Antifungal effects of myrcene, the plant-based naturel compound, were investigated on Fusarium graminearum PH-1 and Fusarium culmorum FcUK99 references, for the first time. Minimum inhibitory concentration (MIC) and half of MIC (MIC
50 ) of both Fusarium strains against myrcene were found as 25 µg/µl and 12.5 µg/µl, respectively. MIC50 application decreased the cell viabilities in the ratios of 34.90% and 33.91% in PH-1 and FcUK99, respectively (p < 0.01). The significantly increased catalase (CAT) activity was recorded in MIC50 treated strains (p < 0.01). Apoptosis-like process and cellular oxidative stress were also monitored with acridine orange/ethidium bromide (Ao/Eb) dual staining and 2',7'-dichlorodihydrofluorescein diacetate (DCF-DA) staining. The genomic template stability (GTS) percentages were calculated as 79% for PH-1 and 71% for FcUK99 via random amplified polymorphic DNA (RAPD). Methylation polymorphism values were calculated as 53.8% and 50.6% in PH-1 and 40.4% and 39% in FcUK99 for HapII and MspI, respectively by coupled restriction enzyme digestion-random amplification (CRED-RA). Methylation-sensitive amplified polymorphism (MSAP) revealed that myrcene caused both type I and type III epigenetic modifications in both genomes. MIC50 dose caused up to 13.86 ± 0.42-fold changes in the expressions of cat, mst20, and stuA, whereas downregulation in tri5 was recorded. Myrcene application did not change the retrotransposon movement in both species by the amplifying of idiomorphic retrotransposon patterns through inter-retrotransposon polymorphism-polymerase chain reaction (IRAP-PCR). This study demonstrated that myrcene is an effective compound in the management of phytopathogenic Fusarium species by causing morphological, genetic, epigenetic, and cellular alterations, and has a potential to utilize as an antifungal agent., (© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)- Published
- 2023
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10. Development of a Dy 2 O 3 @Eu 2 O 3 -carbon nanofiber based electrode for highly sensitive detection of papaverine.
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Teker T and Aslanoglu M
- Subjects
- Electrochemical Techniques, Electrodes, Humans, Papaverine, Carbon, Nanofibers
- Abstract
A sensitive electrochemical method based on carbon nanofibers (CNFs) and bimetallic nanoparticles of dysprosium oxide (Dy
2 O3 ) and europium oxide (Eu2 O3 ) was developed for the determination of papaverine in pharmaceuticals and human urine. Several electrodes were compared in respect to their electrochemically active surface area calculated as 0.0603, 0.1300, 0.3440, 0.3740 and 0.4990 cm2 for bare GCE, CNFs/GCE, Eu2 O3 -CNFs/GCE, Dy2 O3 -CNFs/GCE and Dy2 O3 @Eu2 O3 -CNFs/GCE, respectively. Electrodes were also compared in respect to their performance towards the voltammetric process of papaverine. The peak potential (Epa) of papaverine was 1.094 V, 0.993 V, 0.978 V, 0.969 V and 0.966 V at unmodified GCE, CNFs/GCE, Eu2 O3 -CNFs/GCE, Dy2 O3 -CNFs/GCE and Dy2 O3 @Eu2 O3 -CNFs/GCE, respectively. This indicated that the oxidation peak potential of papaverine shifted gradually towards the negative potentials and the peak current increased gradually from unmodified GCE to CNFs/GCE, Eu2 O3 -CNFs/GCE, Dy2 O3 -CNFs/GCE and Dy2 O3 @Eu2 O3 -CNFs/GCE. The influence of experimental parameters such as scan rate and pH on the voltammetry of papaverine was studied. The Dy2 O3 @Eu2 O3 -CNFs/GCE system presented a dynamic working range between 1.0 × 10-7 and 2.0 × 10-6 M with a detection limit of 1.0 × 10-8 M for papaverine. The platform (Dy2 O3 @Eu2 O3 -CNFs/GCE) exhibited excellent sensitivity and selectivity for papaverine in the presence of uric acid and was successfully applied for determining papaverine in pharmaceuticals and urine samples., Competing Interests: Declaration of competing interest The authors declare that they have no conflict of interest., (Copyright © 2021 Elsevier B.V. All rights reserved.)- Published
- 2021
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11. Novel BRCA2 pathogenic genotype and breast cancer phenotype discordance in monozygotic triplets.
- Author
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Duzkale N, Eyerci N, Oksuzoglu B, Teker T, and Kandemir O
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- Adult, Female, Genotype, Humans, Pedigree, Penetrance, Phenotype, Alternative Splicing, BRCA2 Protein genetics, Breast Neoplasms genetics, Breast Neoplasms pathology, Genetic Predisposition to Disease, Germ-Line Mutation, Triplets genetics
- Abstract
BRCA1/2 genes with high-penetrance are tumor suppressor and tumor susceptibility genes that play important roles in the homologous recombination mechanism in DNA repair and increase breast cancer risk. Variants in BRCA1 or BRCA2 are the main causes of familial and early-onset breast cancer. This study investigated pathogenic variant belonging to the BRCA2 gene splice region in monozygotic triplets. A 44-year-old woman was diagnosed with breast cancer when she was 32 years old. Her monozygotic sister had a history of breast cancer. No malignancy was detected in the third one of the monozygotic triplets. Sanger sequencing was used to evaluate the BRCA1/2 gene status of the patient and family members. It was figured out that they had the same genetic variant, a heterozygous germ-line splice region variant (c.7008-1G > C) in the BRCA2 gene. This novel splice region variant may be a new pathogenic variant of the BRCA2 gene. Its association with breast cancers needs to be further verified in more patient cases., (Copyright © 2019 Elsevier Masson SAS. All rights reserved.)
- Published
- 2020
- Full Text
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12. Parameters of arterial stiffness in patients with Behçet's disease and their relationship with disease duration.
- Author
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Ayar K, Sensoy B, Aslanci ME, Teker T, and Cekic S
- Subjects
- Adult, Case-Control Studies, Humans, Middle Aged, Pulse Wave Analysis, Time Factors, Young Adult, Behcet Syndrome physiopathology, Vascular Stiffness
- Abstract
The results of investigations of arterial stiffness in Behçet's disease (BD) are contradictory and the reason for this contradictory situation is not clear. The lack of studies in homogenous groups according to the duration of the disease may be the cause of conflicting results. To compare arterial stiffness by assessing pulse wave velocity (PWV) and augmentation index (AIx) measurements in healthy controls (HC) and patients diagnosed with BD with short and long disease duration. This cross-sectional study was conducted between August-November 2017 and 54 patients with BD and 34 HC were included. Patients with BD who were diagnosed within 12 months were included in the group with short disease duration (SDD) and the others in the group with long disease duration (LDD). Parameters of cardiovascular risk of all participants were recorded and PWV and AIx values were measured from the brachial artery. AIx was significantly higher in all patients with BD, patients with BD with SDD and patients with BD with LDD, than in HC (p = 0.005, p = 0.011, p = 0.004, respectively). Pulse wave velocity values were not different from HC in patients with BD. When patients with BD with SDD and LDD were compared with each other, PWV was significantly higher in patients with BD with LDD (p = 0.030). There was a moderate correlation between PWV and disease duration (Rho = 0.414, p = 0.002). Augmentation index is higher in patients with BD than HC regardless of disease duration.
- Published
- 2019
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13. Investigation of Camphor Effects on Fusarium graminearum and F. culmorum at Different Molecular Levels.
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Gazdağlı A, Sefer Ö, Yörük E, Varol Gİ, Teker T, and Albayrak G
- Abstract
Fusarium graminearum and F. culmorum are phytopathogens, which cause destructive diseases in cereals. Epidemics of these phytopathogens are caused by mycotoxin contamination and the reduction of crop quality. In this study, the alteration due to in vitro camphor treatment on F. culmorum 9F and F. graminearum H11 isolates was investigated in terms of epigenetic, cellular, and transcription levels. Camphor with different concentrations (0.2, 0.4, 0.8, 1, 2, and 4 µg/µL) was applied to potato dextrose agar (PDA) growth media. The minimum inhibitory concentration (MIC) and the half maximal inhibitory concentration (IC
50 ) were calculated as 2 and 1 µg/µL, respectively. hog1 , mst20 , CAT , POD , mgv1 , stuA , and tri5 genes, which are related to various cellular processes and pathogenesis, were examined by qPCR assay. qPCR analysis showed that camphor treatment leads to the downregulation of tri5 expression but the upregulation of the remaining genes. Apoptosis and oxidative stress were confirmed via acridine orange/ethidium bromide (AO/EB) and dichlorofluorescin diacetate (DCF-DA) staining, respectively. Moreover, coupled restriction enzyme digestion-random amplification (CRED-RA) assay, used for DNA methylation analysis, was carried out to evaluate epigenetic alterations. The decrease in genomic template stability (GTS) values, which resulted due to the alterations in random amplified polymorphic DNA (RAPD) profiles caused by camphor treatment, were detected as 97.60% in F. culmorum 9F and 66.27% in F. graminearum H-11. The outer and inner methylated cytosine profiles are determined by CRED-RA assay as type I⁻IV epigenetic alterations. The outcomes indicated that camphor could lead to alterations at several molecular levels of F. graminearum and F. culmorum .- Published
- 2018
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14. A novel electrochemical platform based on carbon nanofibers and tri-metallic nanoparticles of gold, nickel and cobalt for the quantification of ethyl paraben.
- Author
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Baytak AK, Teker T, Duzmen S, and Aslanoglu M
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- Carbon chemistry, Cobalt chemistry, Cosmetics chemistry, DNA chemistry, Electrodes, Gold chemistry, Hydrogen-Ion Concentration, Nickel chemistry, Oxidation-Reduction, Pharmaceutical Preparations chemistry, Spectroscopy, Fourier Transform Infrared, X-Ray Diffraction, Electrochemical Techniques instrumentation, Metal Nanoparticles chemistry, Nanofibers chemistry, Parabens analysis
- Abstract
A composite of carbon nanofibers (CNFs) and tri-metallic nanoparticles of gold, cobalt and nickel were used for the preparation of a novel voltammetric platform. The proposed voltammetric platform was utilized for quantifying ethyl paraben (EPB) in pharmaceutical and cosmetic products. The electrode layers were characterized by utilizing X-ray diffraction method (XRD) and Fourier transform infrared spectroscopy (FTIR). The electrode system, (Au-Ni-Co)NPs-CNFs/GCE, exhibited high catalytic activity and enhanced the electrochemical behaviour of EPB compared with several other electrodes. The proposed composite layer based electrode produced a well-defined oxidation peak at 0.760V. The determination of EPB was carried out by square wave voltammetry (SWV). The electrode produced a linear plot with a concentration range from 1.0×10
-9 to 1.0×10-7 M at (Au-Ni-Co)NPs-CNFs/GCE. The composite material enabled a detection limit of 3.5×10-10 M for EPB. Good reproducibility, high precision and excellent accuracy for EPB were obtained at (Au-Ni-Co)NPs-CNFs/GCE. The composite layer based platform was successfully applied for the quantification of EPB in pharmaceutical and cosmetic products. The sensitive quantification of EPB is of great importance for the public health care. Furthermore, data show that EPB binds to DNA via intercalation with a binding constant of 2.51(±0.40)×104 ., (Copyright © 2016 Elsevier B.V. All rights reserved.)- Published
- 2017
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15. A sensitive determination of terbutaline in pharmaceuticals and urine samples using a composite electrode based on zirconium oxide nanoparticles.
- Author
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Baytak AK, Teker T, Duzmen S, and Aslanoglu M
- Subjects
- Electrodes, Humans, Nanoparticles ultrastructure, Urine chemistry, Nanoparticles chemistry, Terbutaline analysis, Zirconium chemistry
- Abstract
An accurate and precise determination of terbutaline has been carried out using a glassy carbon electrode (GCE) modified with a composite of multi-walled carbon nanotubes (MWCNTs) and nanoparticles of zirconium oxide (ZrO2NPs). Energy dispersive X-ray and scanning electron microscopic techniques were utilized for the characterization of the composite layer. Terbutaline exhibited a broad oxidation peak at 770mV on a GCE. However, MWCNTs/GCE presented an electrocatalytic effect toward the oxidation of terbutaline with a better anodic peak at 660mV. Furthermore, the electrochemical behavior of terbutaline has greatly been improved at a GCE modified with a composite of MWCNTs and nanoparticles of ZrO2. The ZrO2NPs/MWCNTs/GCE exhibited a sharp anodic wave at 645mV with a large enhancement of the current response for terbutaline. Square wave voltammetry (SWV) was performed for the determination of terbutaline at ZrO2NPs/MWCNTs/GCE. A linear plot was obtained for the current responses of terbutaline against concentrations in the range of 10-160nM yielding a detection limit of 2.25nM (based on 3Sb/m). Improved voltammetric behavior, long-time stability and good reproducibility were obtained for terbutaline at the proposed electrode. A mean recovery of 101.2% with an RSD% of 1.9 was obtained for the analysis of the drug formulation. The accurate and precise quantification of terbutaline makes the ZrO2NPs/MWCNTs/GCE system of great interest for monitoring its therapeutic use., (Copyright © 2016 Elsevier B.V. All rights reserved.)
- Published
- 2016
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16. A composite material based on nanoparticles of yttrium (III) oxide for the selective and sensitive electrochemical determination of acetaminophen.
- Author
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Baytak AK, Teker T, Duzmen S, and Aslanoglu M
- Subjects
- Ascorbic Acid chemistry, Electrodes, Nanotubes, Carbon chemistry, Oxidation-Reduction, Reproducibility of Results, Tablets chemistry, Tyrosine chemistry, Acetaminophen analysis, Electrochemical Techniques instrumentation, Metal Nanoparticles chemistry, Yttrium chemistry
- Abstract
An electrochemical sensor was prepared by modifying a glassy carbon electrode (GCE) with a composite of yttrium (III) oxide nanoparticles (Y2O3NPs) and carbon nanotubes (CNTs) for the determination of acetaminophen (ACT). Compared with a bare GCE and CNTs/GCE, the Y2O3NPs/CNTs/GCE exhibited a well-defined redox couple for ACT and highly enhanced the current response. The separations in the anodic and cathodic peak potentials (ΔEp) for ACT were 552mV, 24mV and 10mV at ba4re GCE, CNTs/GCE and Y2O3NPs/CNTs/GCE, respectively. The observation of only 10mV of ΔEp for ACT at Y2O3NPs/CNTs/GCE was a clear indication of a great acceleration of the electrode process compared to bare GCE and GCE modified with CNTs. Also, l-ascorbic acid (l-AA) and l-tyrosine (l-TRY) did not interfere with the selective determination of ACT. Square wave voltammetry (SWV) was performed for the quantification of ACT. A linear plot was obtained for current responses versus the concentrations of ACT over the range from 1.0×10(-10) to 1.8×10(-8)M with a detection limit of 3.0×10(-11)M (based on 3Sb/m). The proposed composite material provided high electrocatalytic activity, improved voltammetric behavior, good selectivity and good reproducibility. The accurate quantification of ACT makes the proposed electrode of great interest for the public health., (Copyright © 2016 Elsevier B.V. All rights reserved.)
- Published
- 2016
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17. A novel voltammetric sensor based on carbon nanotubes and nanoparticles of antimony tin oxide for the determination of ractopamine.
- Author
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Baytak AK, Teker T, Duzmen S, and Aslanoglu M
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- Animals, Humans, Antimony chemistry, Nanotubes, Carbon chemistry, Phenethylamines analysis, Tin Compounds chemistry
- Abstract
An electrochemical sensor was prepared by the modification of a glassy carbon electrode (GCE) with carbon nanotubes (CNTs) and nanoparticles of antimony tin oxide (ATO). The surface layer was characterized by scanning electronmicroscopy (SEM), energy dispersive X-ray diffraction method (EDX) and ATR FT-IR spectroscopy. The proposed electrode was assessed in respect to the electro-oxidation of ractopamine. Compared with a bare GCE and a GCE electrode modified with CNTs, the ATONPs/CNTs/GCE exhibited a great catalytic activity towards the oxidation of ractopamine with a well-defined anodic peak at 600 mV. The current response was linear with the concentration of ractopamine over the range from 10 to 240 nM with a detection limit of 3.3 nM. The proposed electrode enabled the selective determination of ractopamine in the presence of high concentrations of ascorbic acid (AA), dopamine (DA) and uric acid (UA). The proposed electrode was successfully applied for the determination of ractopamine in feed and urine samples. The sensitive and selective determination of ractopamine makes the developed method of great interest for monitoring its therapeutic use and doping control purposes.
- Published
- 2016
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18. A novel composite electrode based on tungsten oxide nanoparticles and carbon nanotubes for the electrochemical determination of paracetamol.
- Author
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Baytak AK, Duzmen S, Teker T, and Aslanoglu M
- Subjects
- Analgesics, Non-Narcotic analysis, Equipment Design, Equipment Failure Analysis, Nanocomposites ultrastructure, Nanotubes, Carbon ultrastructure, Reproducibility of Results, Sensitivity and Specificity, Acetaminophen analysis, Conductometry instrumentation, Electrodes, Nanocomposites chemistry, Nanotubes, Carbon chemistry, Oxides chemistry, Tungsten chemistry
- Abstract
An electrochemical sensor was prepared by the modification of a glassy carbon electrode (GCE) with a composite of nanoparticles of tungsten oxide (WO3) and carbon nanotubes (CNTs) for the quantification of paracetamol (PR). Energy dispersive X-ray analysis (EDX) and scanning electron microscopy (SEM) were performed for the characterization of the nanocomposite layer. Compared with a bare GCE and a GCE modified with CNTs, the proposed electrode (WO3NPs/CNTs/GCE) exhibited a well-defined redox couple for PR and a marked enhancement of the current response. The experimental results also showed that ascorbic acid (AA) did not interfere with the selective determination of PR. The proposed electrode was used for the determination of PR in 0.1M phosphate buffer solution (PBS) at pH7.0 using square wave voltammetry (SWV). The peak current increased linearly with the concentration of PR in the range of 1.0×10(-9)-2.0×10(-7)M. The detection limit (LOD) was 5.54×10(-11)M (based on 3Sb/m). The proposed voltammetric sensor provided long-time stability, improved voltammetric behavior and good reproducibility for PR. The selective, accurate and precise determination of PR makes the proposed electrode of great interest for monitoring its therapeutic use., (Copyright © 2015 Elsevier B.V. All rights reserved.)
- Published
- 2015
- Full Text
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