26 results on '"Gokce Kaya"'
Search Results
2. Abelmoschus esculentus (L.) Moench seed extract alleviates acute acetaminophen induced liver damage in rats.
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Kocabey, Huseyin, Bekdas, Mervan, Cetinkaya, Ayhan, Duzcu, Selma Erdogan, Alisik, Murat, Dincel, Gokce Kaya, and Turel, Idris
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ABELMOSCHUS ,ACETAMINOPHEN ,PLANT extracts ,ANTI-inflammatory agents ,OXIDATIVE stress - Abstract
Acetaminophen (N-acetyl-p-aminophenol, APAP), commonly called the 'paracetamol', is one of the most regularly utilized medicines, particularly in children. When administered at the recommended doses, it is a safe medication. However, oxidative stress and inflammation caused by exposure to toxic doses lead to centrilobular hepatic necrosis. N-acetylcysteine (NAC) is utilized in the therapy, however it has potential adverse effects. On the other hand, it is known that the seeds of the common vegetable Okra, Abelmoschus esculentus (AE), a herbal product, possess antioxidant and anti-inflammatory qualities. In the present study, we explored whether AE can be used as an alternative to standard NAC therapy without any adverse effect in the treatment of acute APAP induced liver injury. Forty male Wistar rats were placed into five groups: Control, AE, APAP, APAP+AE and APAP+AE+NAC groups. Antioxidants such as native thiol and total thiol were found rised in the APAP group by adding AE (p =0.043 and p =0.028, respectively). Anti-inflammatory indicator IL-10 was also found increased, while marker ALT, which is a sign of hepatotoxicity, got decreased (P=0.005 and P <0.001, respectively). Histologically, AE has been shown to improve worsened congestion (P =0.003), cytoplasmic vacuolization (P =0.01), sinusoidal dilatation (P =0.001), Kupffer cell proliferation (P <0.001) and inflammation (P <0.001). These results suggest that the okra seeds may be a potential therapeutic agent for paracetamol induced hepatotoxicity and it can be attributed to the antioxidant and anti-inflammatory properties. [ABSTRACT FROM AUTHOR]
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- 2023
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3. Antioxidant effect of Abelmoschus Esculentus against acetaminophen-induced nephrotoxicity: an experimental study
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Bekdas, Mervan, primary, Yoldas, Arzu Meyri, additional, Danıs, Aysegul, additional, Duzcu, Selma Erdogan, additional, Alisik, Murat, additional, Cetinkaya, Ayhan, additional, Kocabey, Huseyin, additional, Turel, Idris, additional, Dilek, Mustafa, additional, and Dincel, Gokce Kaya, additional
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- 2022
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4. Antioxidant effect of Abelmoschus Esculentus against acetaminophen-induced nephrotoxicity: an experimental study
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Mervan Bekdas, Arzu Meyri Yoldas, Aysegul Danıs, Selma Erdogan Duzcu, Murat Alisik, Ayhan Cetinkaya, Huseyin Kocabey, Idris Turel, Mustafa Dilek, and Gokce Kaya Dincel
- Abstract
Acetaminophen(APAP) intoxication is an important cause of nephrotoxicity and hepatotoxicity. N-acetylcysteine(NAC) is used in the treatment, but it has some serious side effects. Abelmoschus esculentus(AE) has various benefits as well as antioxidant effects. This study aims to investigate the effect of AE in APAP-induced acute nephrotoxicity. Forty male Wistar rats were divided into five equal groups: Control, AE, APAP, APAP+AE, and APAP+AE+NAC. Significant changes were observed in serum levels of malondialdehyde (MDA), superoxide dismutase (SOD), Neutrophil Gelatinase-Associated Lipocalin(NGAL) and Kidney Injury Molecule-1(KIM-1) after induction with APAP. NGAL and KIM-1 in the AE group remained low compared to those receiving APAP (p=0.022 and p0.001, respectively). When the APAP group was compared with the AE and AE+NAC groups, it was found that even the administration of AE alone significantly decreased NGAL and KIM-1(p=0.036 vs.p=0.029 and p0.001 vs. p0.001, respectively), these results were attributed to the effects of AE on reducing MDA and increasing SOD. Histopathological studies also confirmed these results. These results demonstrated that AE had protective and therapeutic effects on APAP-induced nephrotoxicity. This benefit of AE is due to its antioxidant effect. In addition, AE may also increase the regenerative capacity of the kidney, which APAP reduces.
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- 2022
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5. The predictive role of neutrophil-to-lymphocyte ratio and platelet-to-lymphocyte ratio in children with simple febrile seizures
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Mervan Bekdas, Meyri Arzu Yoldas, Fatma Hanci, and Gokce Kaya Dincel
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medicine.medical_specialty ,medicine.diagnostic_test ,business.industry ,Complete blood count ,Red blood cell distribution width ,Hematocrit ,medicine.disease ,Gastroenterology ,medicine.anatomical_structure ,Febrile seizure ,Internal medicine ,White blood cell ,medicine ,Neutrophil to lymphocyte ratio ,Mean platelet volume ,business ,Mean corpuscular volume - Abstract
Aim: To evaluate the predictive roles of biochemical and complete blood count parameters in the diagnosis of febrile seizures by comparing these between patients with simple febrile seizures and febrile patients without seizures. Methods: One hundred fifty-two children (66 girls and 86 boys), aged 6-60 months presenting with fever symptoms presenting to our hospital’s pediatric emergency department between January 2015 and January 2020 were included in the study. Demographic data, complete blood count parameters and biochemical parameter levels were compared between the two groups. These were divided into a patient group with simple febrile seizures (n = 74) and a febrile control group without seizures (n = 78). Results: Comparison of biochemical parameters revealed significantly higher glucose, CRP, and ALT levels in the febrile seizure group, while Ca and Na were significantly lower. Comparison of complete blood count parameters revealed significantly higher white blood cell (WBC), neutrophil, red cell distribution width, neutrophil-to-lymphocyte ratio (NLR), and platelet-to-lymphocyte ratio (PLR) values in the febrile seizure group, while hemoglobin, hematocrit, mean corpuscular volume, lymphocytes, and mean platelet volume were significantly lower. Conclusions: We think that in addition to markers such as WBC, leukocytes, and CRP for evaluating inflammation in patients with febrile seizures, simple, easily available, and inexpensive tests such as NLR and PLR can also be useful for assessing inflammation.
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- 2021
6. As a Useful Biomonitor of Toxic Trace Element Contamination in the Highly Urbanised Istanbul, Turkey; Mytilus Galloprovincialis
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Gokce Kaya, Mehmet Yaman, and Semra Türkoğlu
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biology ,Environmental chemistry ,Istanbul turkey ,Trace element ,Environmental science ,Contamination ,biology.organism_classification ,Mytilus - Abstract
In this study, concentrations of toxic trace elements were determined by an ICP-MS device in the edible tissues of Mytilus galloprovincialis from the Marmara Sea, İstanbul-Turkey. Concentrations of As, Pb, Cd, Hg, Ni, and Zn were investigated in digestive gland, gills, and muscles tissues of the mussel.According to the results obtained in the study, As, Pb, Cd, Ni, and Zn in the digestive gland of M. galloprovincialis were above the permissible concentrations (mgkg-1), which were 0.672 for Cd, 6.870 for As, 0.788 for Pb, 1.990 for Ni and 42.6 for Zn. The results show that Cd and As mean concentrations in muscle of M. galloprovincialis were above the permissible legal limits. Furthermore, Cd and Ni mean concentrations in gills of M. galloprovincialis were above the permissible levels. Furthermore, it was observed that the highest value belonged to As in the digestive gland of mussels with 65.42% of Provisional Tolerable Weekly Intake. At the same time, the lowest percentage belonged to Zn with 0.22% of PTWI in muscles and 0.313% of PTWI in gills of the mussels. Thus, it is recommended that As, Pb, Cd, Hg, Ni, and Zn concentrations in seafood samples, particularly in mussels, should be monitored periodically.
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- 2021
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7. The predictive role of neutrophil-to-lymphocyte ratio and platelet-to-lymphocyte ratio in children with simple febrile seizures
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Yoldas, Meyri Arzu, primary, Hanci, Fatma, additional, Dincel, Gokce Kaya, additional, and Bekdas, Mervan, additional
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- 2021
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8. The importance of inflammation markers in the diagnosis of COVID-19 in children.
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Yoldas, Meyri Arzu, Dincel, Gokce Kaya, Atasoy, Halil Ibrahim, Tas, Sinan, and Dilek, Mustafa
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COVID-19 testing , *INFLAMMATION , *PEDIATRIC hematology , *BIOCHEMISTRY , *LEUKOCYTE count - Abstract
Aim: To predict the presence of COVID-19 by readily available hematological and biochemical tests. Materials and Methods: A total of 58 children with signs indicative of COVID-19 (28 PCR positives for SARS-CoV2 and 30 negatives) were included in this retrospective study. Clinical and laboratory parameters have been compared between these groups. Results: White blood cell counts, RDW, MPV, NLR, PLR, LDH and CRP values were found to be higher in pediatric patients with positive PCR tests than children with negative PCR tests (p<0.05). There was a significantly positive correlation between CRP and NLR (r=.566, p<0.001), CRP and PLR (r=.462, p<0.001). Conclusion: CRP, NLR and PLR, which are frequently used as inflammation markers, can help predict PCR positivity for SARS-CoV2. These easy-to-use tests can guide diagnosis in countries where access to PCR tests is limited. [ABSTRACT FROM AUTHOR]
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- 2022
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9. Phloretin and phloridzin guard against cisplatin-induced nephrotoxicity in mice through inhibiting oxidative stress and inflammation
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Elif Cadirci, Rustem Anil Ugan, Muhammet Ali Gurbuz, Gokce Kaya, Yasin Bayir, Zekai Halici, Harun Un, Aysenur Kahramanlar, and Belirlenecek
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0301 basic medicine ,Antioxidant ,Efficacy ,Phloretin ,medicine.medical_treatment ,Assay ,Injury ,Antineoplastic Agents ,Pharmacology ,Kidney ,medicine.disease_cause ,Kidney Function Tests ,030226 pharmacology & pharmacy ,General Biochemistry, Genetics and Molecular Biology ,Nephrotoxicity ,03 medical and health sciences ,chemistry.chemical_compound ,Mice ,0302 clinical medicine ,Heat-Shock-Protein-70 ,medicine ,Phloridzin ,Animals ,General Pharmacology, Toxicology and Pharmaceutics ,Cisplatin ,Inflammation ,Mice, Inbred BALB C ,Tissue ,Toxicity ,General Medicine ,Glutathione ,Increases ,Mammalian-Cells ,Oxidative Stress ,030104 developmental biology ,medicine.anatomical_structure ,Phlorhizin ,chemistry ,Gene Expression Regulation ,Female ,Kidney Diseases ,Oxidative stress ,medicine.drug - Abstract
Aim: Cisplatin (Cis) is widely used chemotherapeutic and has some serious side effects as nephrotoxicity. Phloretin (PH) and Phloridzin (PZ) are known their anti-oxidant anti-inflammatory effects. We aimed to examine the protective effects of PH and PZ on cisplatin-induced nephrotoxicity. Main methods: Totally, 48 Balb/C female mice were separated into eight groups (n = 6). First day, single dose of cisplatin (20 mg/kg intraperitoneal) was administered to induce toxicity. PH and PZ were given (50 and 100 mg/kg orally) to treatment groups during 3 days. After the experimental procedures serum renal function enzymes (BUN and Creatinine), oxidative parameters (SOD, GSH and MDA), nuclear agent NFK beta, inflammatory cytokines (Tnf-alpha and IL1 beta) and HSP70 expressions and histopathological assessments were analyzed. Key findings: Serum enzymes, tissue cytokines and oxidative stress were increased after the Cis treatment. PH and PZ treatments normalized all parameters compared to Cis administrated group. After the treatments, SOD activities and GSH levels were increased while MDA levels were decreased. PH and PZ treatments decreased Tnf-alpha, IL1 beta and NFK beta mRNA expressions. Cis significantly increased the HSP70 expression while PH and PZ administrations significantly decreased. Similar the biochemical and molecular results, PH and PZ showed positive effects on tissue pathological parameters. Cisplatin cause a lot of abnormal structures as tubular and glomeruli damages on the kidney. Significance: PH and PZ play important physiological roles in the prevention of nephrotoxicity. Antioxidant and anti-inflammatory effects of PH and PZ demonstrated visible protective effects in the cisplatin-induced nephrotoxicity model.
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- 2020
10. Possible contribution of the neprilysin/ACE pathway to sepsis in mice
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Zekai Halici, Aysenur Kahramanlar, Elif Cadirci, Harun Un, Muhammed Ali Gürbüz, Rustem Anil Ugan, Gokce Kaya, Zeynep Berna Aksakalli-Magden, and Belirlenecek
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Male ,0301 basic medicine ,Nitric Oxide Synthase Type II ,Rat Model ,Pharmacology ,medicine.disease_cause ,030226 pharmacology & pharmacy ,Mice ,0302 clinical medicine ,Enos ,Edema ,Omapatrilat ,General Pharmacology, Toxicology and Pharmaceutics ,Acute Respiratory-Distress ,Lung ,Neprilysin ,Mice, Inbred BALB C ,biology ,Candesartan ,NF-kappa B ,General Medicine ,medicine.anatomical_structure ,Infarction ,Cytokines ,Tumor necrosis factor alpha ,medicine.symptom ,Signal Transduction ,medicine.drug ,Nitric Oxide Synthase Type III ,Acute Lung Injury ,Angiotensin-Converting Enzyme ,Peptidyl-Dipeptidase A ,General Biochemistry, Genetics and Molecular Biology ,Permeability ,Sepsis ,03 medical and health sciences ,Atrial-Natriuretic-Peptide ,medicine ,Animals ,RNA, Messenger ,Vasopeptidase Inhibitor Omapatrilat ,ACE ,Interleukin-6 ,Tumor Necrosis Factor-alpha ,business.industry ,biology.organism_classification ,medicine.disease ,Oxidative Stress ,030104 developmental biology ,business ,Biomarkers ,Oxidative stress - Abstract
Aim Omapatrilat is an antagonist of angiotensin-converting (ACE) and neprilysin-neuropeptidase (NEP) enzymes. The aim of our study is to show that omapatrilat may have beneficial effects as a treatment for polymicrobial sepsis. Main methods A cecal ligation and puncture (CLP) sepsis model was used to evaluate 10 and 20 mg/kg doses of omapatrilat in mice (n = 30) fasted for 12 h. The lungs were removed 12 h after CLP, and lung levels of cytokines (tumor necrosis factor-alpha [TNF-α], interleukin-6 [IL-6], NF-κB), iNOS and eNOS mRNA expression, GSH and MDA levels, and ACE and NEP activities were determined. Histopathological examinations were also performed. Key findings Omapatrilat treatment provided a dose-dependent reduction in oxidative stress and inflammatory parameters in lung tissues. Omapatrilat administration decreased lung iNOS and eNOS mRNA levels at 20 mg/kg dose. Histopathological analysis revealed a decline in the thickening and edema areas in the alveolar septa in the Sepsis+OMA20 group. Significance Omapatrilat, a dual ACE and NEP inhibitor, protected lung tissue from sepsis damage by reducing ACE and NEP activities, by decreasing the mRNA expression levels of pro-inflammatory cytokines (TNF-α, IL-6, and NF-κB), by suppressing leukocyte infiltration and edema, by restoring iNOS and eNOS levels, and by restoring SOD activity and GSH and MDA levels, thereby reducing oxidative stress.
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- 2020
11. Effects of gestational exercise on hyperoxia-induced brain damage in the newborn
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Nimet Kabakuş, Gamze Dilek, Mervan Bekdas, Mustafa Dilek, Erol Ayaz, Gokce Kaya Dincel, and Ayhan Cetinkaya
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Hyperoxia ,Pregnancy ,Microcephaly ,Brain development ,business.industry ,Offspring ,Brain Mass ,Physiology ,Brain damage ,medicine.disease ,medicine ,Gestation ,medicine.symptom ,business - Abstract
Aim: Preterm infants encounter hyperoxia relatively early on as they leave the intrauterine environment earlier than expected, while also being exposed to a higher level of hyperoxic stress due to insufficiencies in their antioxidant defense mechanisms. With that in mind, we investigate whether running exercises performed during pregnancy can contribute to the development of tolerance to neonatal hyperoxic brain damage. Method: While two female rats maintained a sedentary pregnancy, one female rat performed the mandatory running exercise for 30 minutes for five days a week throughout the pregnancy. Following delivery, the sedentary rats and the exercised rat were kept together with their offspring for five days at oxygen concentrations above 80 percent in order to induce brain damage. The offspring were sacrificed on postnatal Day 7 and brain/body ratio measurements were obtained. Results: The brain/body ratios in the control, hyperoxia and exercise-hyperoxia groups were found to be median (IQR) 0.074(0.68-0.77), 0.065(0.06-0.067) and 0.064(0.060-0.068), respectively. The brain/body ratios of the offspring of the mothers in the hyperoxia group were found to be significantly lower than the control group (p=0.002), irrespective of exercise (p=0.007). No statistically significant difference was noted between the offspring of the sedentary and the exercised mothers in the hyperoxia group (p=0.94). Conclusion: Hyperoxia was found to result in lower brain mass relative to total body mass. This finding, which indicates the presence of microcephaly, reflects the negative effects of hyperoxia on brain development. Contrary to expectations, exercises performed during pregnancy had no significant effect on the brain/body weight ratio of the offspring.
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- 2018
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12. Bioaccumulation of Heavy Metals in Various Tissues of Some Fish Species and Green Tiger Shrimp (Penaeus semisulcatus) from İskenderun Bay, Turkey, and Risk Assessment for Human Health
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Semra Turkoglu and Gokce Kaya
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Risk ,Common sole ,Veterinary medicine ,Turkey ,Endocrinology, Diabetes and Metabolism ,Clinical Biochemistry ,Food Contamination ,Sillago sihama ,010501 environmental sciences ,Risk Assessment ,01 natural sciences ,Biochemistry ,Dietary Exposure ,Inorganic Chemistry ,Merlangius merlangus ,0404 agricultural biotechnology ,Penaeidae ,Metals, Heavy ,Mediterranean Sea ,Water Pollution, Chemical ,Animals ,Humans ,Tissue Distribution ,Shellfish ,Skin ,0105 earth and related environmental sciences ,biology ,Biochemistry (medical) ,Fishes ,Muscle, Smooth ,04 agricultural and veterinary sciences ,General Medicine ,biology.organism_classification ,040401 food science ,Whiting ,Toxicokinetics ,Shrimp ,Heavy Metal Poisoning ,Fishery ,Seafood ,Penaeus semisulcatus ,Bioaccumulation ,Flatfishes ,Bay ,Water Pollutants, Chemical ,Environmental Monitoring - Abstract
In this study, concentrations of heavy metals were determined by ICP-MS in the edible tissues of common sole (Solea solea Linnaeus, 1758), whiting (Merlangius merlangus Linnaeus, 1758), silver sillago (Sillago sihama Forsskal, 1775) and muscle-exoskeleton of green tiger shrimp (Penaeus semisulcatus De Haan, 1844), from the seas of Iskenderun Bay, Eastern Mediterranean, Turkey, in January–February, 2016. The lowest and highest mean concentrations of Mn, Cr, Cd, Ni, Hg, As, Pb, and Co in fish and shrimp’ muscles were found, respectively, as follows: 0.166–0.382, 0.134–0.336, 0.005–0.008, 0.091–0.140, 0.026–0.228, 1.741–29.254, 0.087–0.110, and
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- 2017
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13. Use of salidroside in a lipopolysaccharide-induced periventricular leukomalacia model
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Mervan Bekdas, Gokce Kaya Dincel, Mustafa Dilek, Ayhan Cetinkaya, and Nimet Kabakuş
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Periventricular leukomalacia ,Lipopolysaccharide ,biology ,Offspring ,business.industry ,Salidroside ,Pharmacology ,biology.organism_classification ,medicine.disease ,chemistry.chemical_compound ,Rhodiola rosea ,chemistry ,Apoptosis ,Rhodiola ,medicine ,Gestation ,business - Abstract
Aim: Research into the different treatment methods based on the intrauterine lipopolysaccharide (LPS)-induced Periventricular leukomalacia (PVL) model, as one of the main causes of morbidity in preterm infants still continues to be relevant. The present study investigates the effect on PVL of salidroside obtained from Rhodiola Rosea (golden root, orpin rose), which is a plant with known for its medicinal qualities. Method: To develop an induced PVL model, a 500 microgram/kg dose of LPS (Escherichia coli, serotype 055:B5, Sigma) was applied to two pregnant rats intraperitoneally on day 18, day 19 and day 20 of gestation. One of the LP applied rats was given 25 mg/kg Salidroside (250 mg Rhodiola root extract capsules, which include 3 mg Salidroside) by oral gavage (LPS+Salidroside), and a physiological saline solution was given to the control group. After delivery, 10 offspring of the LPS-applied mother, nine offspring of the LPS+Salidrosideapplied mother and seven offspring of the control mother were sacrificed on postnatal Day 7 with ether anesthesia. The caspase enzyme located in apoptosis pathways of 10 percent neutral-buffered formalin fixed brain tissue was stained immunohistochemically, and apoptotic cells were counted. Results: No statistically significant difference was noted between the LPS+Salidroside group and the control group, while a statistically significant difference was noted between the LPS and LPS+Salidroside groups. It was observed that Salidroside reduced LPS induced apoptosis. Conclusion: The intended experimental neuroprotective effect of Salidroside usage was provided through the inhibition of apoptosis in a PVL-damaged brain.
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- 2018
14. Toxic and essential metals in Cyprinus carpio, Carassius gibelio, and Luciobarbus esocinus tissues from Keban Dam Lake, Pertek, Turkey
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Semra Turkoglu and Gokce Kaya
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biology ,Turkey ,010401 analytical chemistry ,Public Health, Environmental and Occupational Health ,Cyprinidae ,010501 environmental sciences ,Toxicology ,biology.organism_classification ,01 natural sciences ,0104 chemical sciences ,Cyprinus ,Fishery ,Lakes ,Metals ,Carassius ,Animals ,Luciobarbus esocinus ,Muscle, Skeletal ,Water Pollutants, Chemical ,0105 earth and related environmental sciences ,Food Science - Abstract
In various tissues of Luciobarbus esocinus, Cyprinus carpio, and Carassius gibelio which were taken from Keban Dam Lake Pertek region's freshwaters, Turkey in January-February 2016, concentrations of mercury, nickel, lead, cadmium, arsenic, manganese, chromium, and cobalt were analysed by inductively coupled plasma-mass spectrometry (ICP-MS) after microwave digestion. In fish muscle mean chromium concentration (0.614 mg kg
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- 2017
15. Analysis of certain fatty acids and toxic metal bioaccumulation in various tissues of three fish species that are consumed by Turkish people
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Semra Turkoglu and Gokce Kaya
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Mullus barbatus ,Turkey ,Health, Toxicology and Mutagenesis ,Pagellus ,010501 environmental sciences ,Biology ,01 natural sciences ,Environmental Chemistry ,Ecotoxicology ,Animals ,Humans ,0105 earth and related environmental sciences ,chemistry.chemical_classification ,Mugil ,Poisoning ,010401 analytical chemistry ,Fatty Acids ,Fishes ,General Medicine ,biology.organism_classification ,Pollution ,Eicosapentaenoic acid ,0104 chemical sciences ,Heavy Metal Poisoning ,chemistry ,Docosahexaenoic acid ,Bioaccumulation ,Environmental chemistry ,Water Pollutants, Chemical ,Polyunsaturated fatty acid - Abstract
Concentrations of toxic metals (Mn, Ni, Hg, Cd, Pb, Cr) in the muscle, skin, and liver of Mugil cephalus, Mullus barbatus, and Pagellus erythrinus which were purchased in large supermarkets of Elazig, and Mullus barbatus, which were caught on the sea of Iskenderun Bay, Turkey, were analyzed. Fundamental analyses were carried out by inductively coupled plasma-mass spectrometry (ICP-MS) after samples were prepared by microwave digestion. Mean metal concentrations in different tissues were varied in the ranges of Cd 4–426, Cr 116–4458, Mn 141–24774, Hg 9–471, Pb 96–695, and Ni 68–6581 μg kg−1, for wet weight. The investigated metal bioaccumulation in the muscles of fish species, in general, was lower than those in the liver and skin. This method was verified by NCS ZC73016 chicken trace element-certified reference material analysis. In addition, fatty acids in the muscles of three fish species were analyzed. According to the gas chromatography (GC) results of fatty acids, the monounsaturated fatty acids (MUFA) were found to be between 23.76 and 31.97%. The fatty acids’ polyunsaturated fatty acids (PUFA) ratio was found to be between 13.67 and 30.71% and saturated fatty acids ratios were determined in the range of 24.06–32.30%. In all fish species, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) ratio, which increase the value of these fish species, were high. These results show that these three fish species are good sources of fatty acids.
- Published
- 2016
16. DETERMINATION OF TRACE METALS IN PLANT LEAVES AS BIOMONITOR OF POLLUTION EXTENT BY A SENSITIVE STAT-AAS METHOD
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Gokce Kaya and Mehmet Yaman
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Pollution ,Cadmium ,biology ,General Chemical Engineering ,Industrial area ,media_common.quotation_subject ,chemistry.chemical_element ,biology.organism_classification ,Platanus ,chemistry ,Olea ,Environmental chemistry ,Hyperaccumulator ,Vitis vinifera ,Instrumentation ,Bioindicator ,General Environmental Science ,media_common - Abstract
The aim of this study is to assess the potential of bioindicator/biomonitor plants to determine pollution extent of toxic metals. Lead, cadmium, and copper concentrations in the plants including Platanus sp., Olea europaea L., Vitis vinifera L., and Armeniaca sp. taken from the industrial area of the city of Gaziantep, Turkey, and control location were determined by using STAT-atomic absorption spectrometry. Lead concentration in leaves of Platanus sp. taken from 50 m around the battery plant was found to be higher than 3,000 mg kg−1. The observed Pb concentration in this plant was 40 times higher than that in Armeniaca sp. grown in the same location. The limits of detection for plants were found to be 0.050 mg kg−1 for Pb and Cu and 0.005 mg kg−1 for Cd. It was concluded that the Platanus sp. plant can be considered as both biomonitor and hyperaccumulator.
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- 2012
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17. Determination of Elements in Thermal Springs for Monitoring Pre-Earthquake Activites by ICP-MS
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Sukran Akkus, Muharrem Ince, Ahmet Sasmaz, Gokce Kaya, Mehmet Yaman, Nagihan M. Karaaslan, and Cemile Ozcan
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Chemistry ,Speciation ,Analytical chemistry ,Precursors ,Mineralogy ,Anomalies ,Hydrogeochemical Changes ,Enrichment ,Radon ,Region ,Groundwater ,Inductively coupled plasma mass spectrometry ,Spectroscopy ,Waters ,Cadmium - Abstract
This study presents the results of hydrogeochemical studies carried out at the Kos thermal springs in Bingol, located in East Anatolia, Turkey. More than 250 thermal water samples were collected on a regular basis from November 2006 to January 2009 to measure element concentrations as a monitor of earthquake precursors. Water samples were analyzed using inductively coupled plasma mass spectrometry (ICP-MS). The B, Ba, Br, and Ge concentrations were monitored for three years and ranged from 6822-7666, 64-101, 271-406, and 4.1-6.0 mu g L-1, respectively. The chloride concentrations for this period were in the 89-127 mg L-1 range. The data identify some element anomalies at least two hours prior to a major earthquake and for some time afterwards. These anomalies are characterized by decreases up to 20% in B, Ba, Cl, and Ge concentrations and can be attributed to stress-/strain-induced pressure changes in the subsurface water systems. From this study, it can be suggested that thermal springs in a fault line area are ideal sites for monitoring precursors to earthquakes. Scientific and Technical Research Council of TurkeyTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [TUBITAK-106Y051] This work was financially supported by The Scientific and Technical Research Council of Turkey (Project number: TUBITAK-106Y051).
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- 2011
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18. Acrylamide concentrations in grilled foodstuffs of Turkish kitchen by high performance liquid chromatography-mass spectrometry
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Cemile Ozcan, Mehmet Yaman, Olcay Kaplan, Muharrem Ince, and Gokce Kaya
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Acrylamide ,Gas-Chromatography ,Chromatography ,Column temperature ,Heated Foods ,Chemistry ,Potato chips ,French Fries ,food and beverages ,Grilled meat ,Mass spectrometry ,Chicken ,Market ,Coffee ,High-performance liquid chromatography ,HPLC-MS ,Maillard Reaction ,Analytical Chemistry ,chemistry.chemical_compound ,Injection volume ,Food science ,Potato ,Spectroscopy - Abstract
For over ten years, there has been a considerable interest in determination of acrylamide in foodstuffs. It was known that both protein-rich and carbohydrates-rich foods cooked at high-temperatures can cause acrylamide formation. However, carbohydrates-rich foods such as potato chips and biscuit samples have been the common studied foods compared with protein-rich foods such as meat samples. In this study, determination of acrylamide in these two group foods was examined using HPLC-MS. For this purpose, firstly, the parameters that are thought to affect the response in the HPLC-MS analysis were optimized. The optimized conditions were found to be 0.3 ml min(-1) for flow rate of mobile phase, 40 mu l for injection volume, 5 degrees C for column temperature and 70 V for fragmentor potential. The optimized method was applied for the determination of acrylamide levels in Turkish foodstuffs including grilled meat and chicken samples, potato chips, coffee and biscuit. The obtained concentrations for all studied foods were in the range of 20-250 mu g kg(-1). The results showed that acrylamide concentrations highly varied depending on the kind of food samples. (C) 2009 Elsevier B.V. All rights reserved.
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- 2009
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19. Flame Atomic Absorption Spectrometric Determination of Pb, Cd, and Cu in Pinus nigra L. and Eriobotrya japonica Leaves Used as Biomonitors in Environmental Pollution
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Mehmet Yaman, Cemile Ozcan, and Gokce Kaya
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Pollution ,Turkey ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,chemistry.chemical_element ,Environmental pollution ,Eriobotrya ,Toxicology ,Japonica ,Hyperaccumulator ,Trace metal ,media_common ,Cadmium ,biology ,Spectrophotometry, Atomic ,General Medicine ,Pinus ,biology.organism_classification ,Plant Leaves ,Lead ,chemistry ,Environmental chemistry ,Bioaccumulation ,Calibration ,Environmental Pollution ,Copper ,Environmental Monitoring - Abstract
The assessment of trace metal pollution in Gaziantep city-Turkey has been studied using plant leaves of Pinus nigra L. and Eriobotrya japonica as biomonitor. The concentrations up to 3,056 mg Pb kg(-1) in the needles of Pinus nigra L., and 367 ng Cd g(-1) in the leaves of Eriobotrya japonica were determined. The observed Cu concentrations were in range of 1.6-7.1 mg kg(-1). The Pb, Cd, and Cu levels in soils were determined to be in the range of 17-602, 0.142-0.656, and 12-38 mg kg(-1), respectively. It was concluded that Pinus nigra L. can be considered as both biomonitor of atmospheric Pb pollution and hyperaccumulator plant.
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- 2009
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20. Solid phase extraction and preconcentration of cobalt in mineral waters with PAR-loaded Amberlite XAD-7 and flame atomic absorption spectrometry
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Gokce Kaya, Mehmet Yaman, and Muharrem Ince
- Subjects
Detection limit ,Chromatography ,Chemistry ,Elution ,chemistry.chemical_element ,Amberlite ,law.invention ,chemistry.chemical_compound ,Adsorption ,Nitric acid ,law ,Environmental Chemistry ,Solid phase extraction ,Atomic absorption spectroscopy ,Cobalt - Abstract
A simple, sensitive, accurate, and selective method for determination of ultratrace levels of Co is modified. The method is based on preconcentration of Co on the PAR-loaded Amberlite XAD-7 at pH 2.0 ± 0.2 for contact time as low as 45 min. The adsorbed cobalt was eluted with concentrated nitric acid and measured by flame atomic absorption spectrometry. Recoveries up to 90% were achieved. The optimized preconcentration method was applied to cobalt determination in natural mineral waters. The detection limit was found to be 0.1 ng mL−1. The relative standard deviation was found to be 13% for 600 mL of 2.0 ng mL−1, for 10 replicate preconcentration procedures. Cobalt concentrations in the studied water samples were found to be in the ranges of 0.5–3.5 ng mL−1.
- Published
- 2009
- Full Text
- View/download PDF
21. Online preconcentration for the determination of lead, cadmium and copper by slotted tube atom trap (STAT)-flame atomic absorption spectrometry
- Author
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Mehmet Yaman and Gokce Kaya
- Subjects
Analyte ,Cadmium ,Spectrum Analysis ,Analytical chemistry ,chemistry.chemical_element ,Trapping ,Plants ,Sensitivity and Specificity ,Copper ,Analytical Chemistry ,law.invention ,Lead ,chemistry ,law ,Atom ,Tube (fluid conveyance) ,Atomic absorption spectroscopy ,Quartz - Abstract
An online sensitivity enhancement by using atom trapping in flame atomic absorption spectrophotometry was examined for increasing the residence time of the analyte atoms in the light path. For this purpose, various parameters of quartz tubes of the slotted tube atom trap were tested. The studied parameters include the internal diameter, the length of the upper slot and the wall thickness of quartz tube. The best sensitivities as high as 7-fold, 13-fold and 3-fold enhancement were achieved by the tubes having an internal diameter of 6 mm, an upper slot length of 1.0 cm and the wall thickness of 1.5 mm for lead, cadmium and copper, respectively. The limits of quantitation were found to be 30 ng mL(-1) for Pb and 3 ng mL(-1) for Cd and 30 ng mL(-1) for Cu by the optimized method. The achieved technique was applied to determine the concentrations of Pb, Cd and Cu in different plant leaves taken around cement and textile industries.
- Published
- 2008
- Full Text
- View/download PDF
22. Comparison of trace element concentrations in cancerous and noncancerous human endometrial and ovary tissues
- Author
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Mehmet Yaman, Mehmet Simsek, and Gokce Kaya
- Subjects
Pathology ,medicine.medical_specialty ,chemistry.chemical_element ,Ovary ,Endometrium ,law.invention ,law ,Metals, Heavy ,medicine ,Humans ,Trace metal ,Ovarian Neoplasms ,Calcium metabolism ,Cadmium ,business.industry ,Spectrophotometry, Atomic ,Trace element ,Obstetrics and Gynecology ,Molecular biology ,Copper ,Endometrial Neoplasms ,Trace Elements ,medicine.anatomical_structure ,Oncology ,chemistry ,Calibration ,Calcium ,Female ,Atomic absorption spectroscopy ,business - Abstract
Question of whether trace metal concentrations in tissues are increased or decreased in cancerous patients in comparison with noncancerous patients has not been answered yet, due to the fact that the data known in this field are rare and have contradictory results. Although Zn and Cu concentrations in serum and tissues of cancerous patients have extensively been studied, the precise role of these metals in carcinogenesis is not clearly understood. There are few studies on the concentrations of essential and toxic trace/minor metals in human tissue samples in comparison with serum and plasma samples. Trace metal concentrations including Cd, Cu, Zn, Fe, Mg, Ca, and Ni in both cancerous and noncancerous endometrial, ovary, and cervix uteri tissues were determined by atomic absorption spectrometry. The tissue samples were digested by using microwave energy. Slotted tube atom trap was used to improve the sensitivity of copper and cadmium in flame atomic absorption spectrometry determination. The concentrations of iron in cancerous endometrial tissues were found to be significantly higher than those in noncancerous samples (P< 0.01). On the contrary Fe, Zn concentration in cancerous endometrial tissue was found to be lower significantly than those in noncancerous samples (P= 0.005), whereas the other studied metals were not observed different. Furthermore, Cu and Ca concentrations in cancerous ovary samples were observed to be higher than those in noncancerous ovary tissues (P< 0.01 for Cu andP= 0.1 for Ca), whereas Mg, Fe, and Zn levels in cancerous ovary samples were not found to be different than those in noncancerous tissues.
- Published
- 2007
- Full Text
- View/download PDF
23. Speciation of iron (II) and (III) by using solvent extraction and flame atomic absorption spectrometry
- Author
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Gokce Kaya and Mehmet Yaman
- Subjects
Chloroform ,Chemistry ,Extraction (chemistry) ,Analytical chemistry ,Biochemistry ,Analytical Chemistry ,law.invention ,Bioavailability ,chemistry.chemical_compound ,Volume (thermodynamics) ,law ,Reagent ,Phase (matter) ,Environmental Chemistry ,Sample preparation ,Atomic absorption spectroscopy ,Spectroscopy - Abstract
A method for speciation, preconcentration and separation of Fe 2+ and Fe 3+ in different matrices was developed using solvent extraction and flame atomic absorption spectrometry. PAN as complexing reagent for Fe 2+ and chloroform as organic solvent were used. The complex of Fe 2+ -PAN was extracted into chloroform phase in the pH range of 0.75-4.0 and Fe 3+ remains in water phase in the pH range 0.75-1.25. The optimum conditions for maximum recovery of Fe 2+ and minimum recovery of Fe 3+ were determined as pH = 1, the stirring time of 20 min, the PAN amount of 0.5 mg and chloroform volume of 8 mL. The developed method was applied to the determination of Fe 2+ and Fe 3+ in tea infusion, fruit juice, cola and pekmez. It is seen that there is high bioavailable iron (Fe 2+ ) in pekmez. The developed method is sensitive, simple and need the shorter time in comparison with other similar studies.
- Published
- 2005
- Full Text
- View/download PDF
24. Sequential and Selective Extraction of Copper in Different Soil Phases and Plant Parts from Former Industrialized Area
- Author
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Mehmet Yaman, Gokce Kaya, Olcay Kaplan, and Güzel Sanatlar Fakültesi
- Subjects
biology ,Chemistry ,media_common.quotation_subject ,Extraction (chemistry) ,Trace element ,Soil Science ,chemistry.chemical_element ,biology.organism_classification ,Copper, extraction, plant, soil, speciation ,Copper ,Human health ,Speciation ,Environmental chemistry ,Soil water ,Copper levels ,Rumex ,Agronomy and Crop Science ,media_common - Abstract
Copper (Cu) is an essential trace element for all living organisms; however, excess amounts in soil, plants, and food have negative impacts on the environment and human health. The aim of this study was to determine Cu levels in different chemical phases of soils and the relationship between Cu levels in soil phases and concentrations in plants. Soils and plants grown in these soils from an industrialized area in Turkey were analyzed using a selective and four-stage sequential extraction procedure. Copper levels in exchangeable fractions were found up to 658 mg kg−1 while total levels were in the range of 133–5609 mg kg−1. Copper concentrations in plant parts (roots and stem) were in the range of 2.6–240 mg kg−1. The exchangeable forms of Cu were in the range of 3–22% of total Cu concentrations. The relationships were observed between soil Cu and Rumex plant Cu, and soil Cu and root of Brassicasea plant Cu.
- Published
- 2011
25. Distribution of trace metal concentrations in paired cancerous and non-cancerous human stomach tissues
- Author
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Hayrettin Yekeler, Mehmet Yaman, and Gokce Kaya
- Subjects
Adult ,Pathology ,medicine.medical_specialty ,Iron ,Human stomach ,Nickel ,Stomach Neoplasms ,medicine ,Distribution (pharmacology) ,Humans ,Trace metal ,Magnesium ,Aged ,Chemistry ,Stomach ,digestive, oral, and skin physiology ,Gastroenterology ,General Medicine ,Middle Aged ,Trace Elements ,Zinc ,medicine.anatomical_structure ,Calcium ,Copper ,Rapid Communication - Abstract
To assess whether trace metal concentrations (which influence metabolism as both essential and non-essential elements) are increased or decreased in cancerous tissues and to understand the precise role of these metals in carcinogenesis.Concentrations of trace metals including Cd, Ni, Cu, Zn, Fe, Mg and Ca in both cancerous and non-cancerous stomach tissue samples were determined by atomic absorption spectrometry (AAS). Tissue samples were digested using microwave energy. Slotted tube atom trap was used to improve the sensitivity of copper and cadmium in flame AAS determinations.From the obtained data in this study, the concentrations of nickel, copper and iron in the cancerous human stomach were found to be significantly higher than those in the non-cancerous tissues, by using t-test for the paired samples. Furthermore, the average calcium concentrations in the cancerous stomach tissue samples were found to be significantly lower than those in the non-cancerous stomach tissue samples by using t-test. Exceedingly high Zn concentrations (207-826 mg/kg) were found in two paired stomach tissue samples from both cancerous and non-cancerous parts.In contrast to the literature data for Cu and Fe, the concentrations of copper, iron and nickel in cancerous tissue samples are higher than those in the non-cancerous samples. Furthermore, the Ca levels are lower in cancerous tissue samples than in non-cancerous tissue samples.
- Published
- 2007
26. Use of atomic absorption spectrometry in assessment of biomonitor plants for lead, cadmium and copper pollution.
- Author
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Gokce K and Mehmet Y
- Subjects
- Cities, Environmental Pollution, Plant Leaves chemistry, Plants, Soil chemistry, Turkey, Cadmium analysis, Copper analysis, Environmental Monitoring, Lead analysis, Soil Pollutants analysis, Spectrophotometry, Atomic
- Abstract
Eleven plant species were collected from the vicinity of lead-battery plant in the city of Gaziantep, Turkey. Lead, cadmium and copper concentrations in the soil and leaves of plants were determined by atomic absorption spectrometry. Lead, Cd and Cu concentrations in the soil samples taken from battery area were found to be in the ranges of 304-602, 0.4-0.44 and 31-37 mg x kg(-1), respectively. Significantly increased lead concentration up to 2 750 mg x kg(-1) was found in the leaves of Eleagnus angustifolia L. plant. The lead concentrations in the other plant leaves taken from 50 m around battery factory followed the order Ailanthus altissima > Morus sp. > Juglans regia L. > Ficus carica L. > Cydonia oblonga Miller > Prunus x domestica L. The plants, Populus nigra L. , Eleagnus angustifolia L. and Salix sp. were found useful for Cd, and the plant, Eleagnus angusti folia L. for Pb, to be considered as potential biomonitor. Especially, leaves of trees and plants taken from the distance of 50 m from battery plant have relatively higher Pb concentrations. Therefore, people who and animals which live in this area and benefit from these soil and plants have vital risks.
- Published
- 2012
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