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Erdoğu İ, Dural E, Altundağ H, Oymak T, Süzen HS. The relationship between lymphocyte DNA damage, coronary artery disease, and blood trace elements. Mutagenesis 2024; 39:43-55. [PMID: 37818856 DOI: 10.1093/mutage/gead030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 09/28/2023] [Indexed: 10/13/2023] Open
Abstract
Somatic DNA damage and causative factors (occupational exposures, foods, habits, etc.) are thought to contribute to the pathogenesis of atherosclerosis, although knowledge about their role in coronary artery disease (CAD) is still insufficient. This study aimed to determine the effects of lymphocyte-DNA damage and blood trace element concentrations on CAD. The single-cell alkaline comet was used in the measuring of the lymphocyte DNA damage in blood samples obtained from patients (n = 99) whose CAD grade was determined by the syntax score while the angiographic intervention was carried out. Blood trace element (n = 14) concentrations were monitored by the inductively coupled plasma-optical emission spectroscopy (ICP-OES) after microwave digestion. The relationship between the DNA damage frequencies of the participants and their syntax scores, blood trace element concentrations, and other demographic and clinic parameters were statistically analyzed. Significant correlations were detected between comet data and syntax score (r = 0.858, P < .001), age (r = 0.337, P < .001), blood-urea (r = 0.360, P < .001), creatinine (r = 0.388, P < .001), HbA1c (0.218, P < .05), ECG-QRS time (r = 0.286, P < .01), ECHO-EF (r = -0.377, P < .001), and platelet (r = -0.222, P < .05). The DNA damage frequencies of the groups formed according to their CAD scores were significantly different from the control group (P < .001) and also each other (P ≤ .01). Comet frequencies and CAD grades were found to be correlated with aging (P < .05). DNA damage frequency and syntax score values were significantly (P < .05) higher in males compared to females. Syntax scores were correlated with aging (r = 0.348, P < .01), ECHO-EF (r = 0.374, P < .001), blood-urea (r = 0.398, P < .001), creatinine (r = 0.433, P < .001), glucose (0.218, P < .05), and HbA1c (r = 0.200, P < .05). Significant correlations were observed between trace elements and demographic values, blood parameters, diseases, angio parameters, ECHO, and ECG parameters. It was observed that the concentrations of trace elements detected in the blood were 93.4% correlated with each other. Lymphocyte DNA damage is a strong biomarker for the atherosclerotic indicator of CAD. Aging is an effective factor both in the DNA damage frequency and CAD risk index. Creatinine and urea are factors that have the power to change the CAD risk index and DNA damage frequency. The higher DNA damage and CAD risk were monitored in males compared to females. The relationship between some biomarkers and blood trace element concentrations showed that further studies are needed to more accurately evaluate the relationship between trace elements, DNA damage frequencies, and CAD.
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Affiliation(s)
- İsmail Erdoğu
- Department of Cardiology, Medicana Sivas Hospital, Medicana Health Group, Sivas 58070, Turkey
| | - Emrah Dural
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Cumhuriyet University, Sivas 58140, Turkey
| | - Hüseyin Altundağ
- Department of Chemistry, Faculty of Art and Science, Sakarya University, Sakarya 54187, Turkey
| | - Tülay Oymak
- Department of Analytical Chemistry, Faculty of Pharmacy, Cumhuriyet University, Sivas 58140, Turkey
| | - Halit Sinan Süzen
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Ankara University, Ankara 06560, Turkey
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Demirbugen Oz M, Ozdemir F, Tok KC, Dural E, Kir Y, Ulusoy M, Gumustas M, Baskak B, Suzen HS. The potential role of por*28 and cyp1a2*f genetic variations and lifestyle factors on clozapine and n-desmethyl clozapine plasma levels in schizophrenia patients. Expert Opin Drug Metab Toxicol 2023. [PMID: 37269349 DOI: 10.1080/17425255.2023.2221849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 05/24/2023] [Indexed: 06/05/2023]
Abstract
BACKGROUND Despite its advantages over other antipsychotics, for treatment-resistant schizophrenia, clinical use of Clozapine (CLZ) is challenging by its narrow therapeutic index and potentially life-threatening dose-related adverse effects. RESEARCH DESIGN AND METHODS As the potential role in CLZ metabolism is assigned to CYP1A2 enzyme and consequently Cytochrome P450 oxidoreductase (POR) their genetic variations might help to determine CLZ levels in schizophrenia patients. For this purpose, 112 schizophrenia patients receiving CLZ were included in the current study. Plasma CLZ and N-desmethylclozapine (DCLZ) levels were analyzed by using HPLC and genetic variations were identified with the PCR-RFLP method. RESULTS The patients' CYP1A2 and POR genotypes seemed to not affect plasma CLZ and DCLZ levels whereas in the subgroup analysis, POR × 28 genotype significantly influenced simple and adjusted plasma CLZ and DLCZ levels concerning smoking habit and caffeine consumption. CONCLUSIONS The findings of the present study highlight the importance of both genetic and non-genetic factors (smoking and caffeine consumption) for the individualization of the CLZ treatment. In addition to that, it suggests that the added utility of not only the CLZ metabolizing enzymes but also POR, which is crucial for proper CYP activity, to guide CLZ dosing might be useful for clinical decision-making.
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Affiliation(s)
- Merve Demirbugen Oz
- Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Ankara University, Ankara, Turkey
| | - Fezile Ozdemir
- Dr Fazil Kucuk Faculty of Medicine, Eastern Mediterranean University, North, Cyprus, Turkey
| | - Kenan Can Tok
- Institute of Forensic Sciences, Department of Forensic Toxicology, Ankara University, Ankara, Turkey
| | - Emrah Dural
- Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Sivas Cumhuriyet University, Sivas, Turkey
| | - Yagmur Kir
- Bursa Acibadem Hospital, Department of Psychiatry, Bursa, Turkey
| | - Muge Ulusoy
- School of Medicine, Department of Psychiatry, Ankara University, Ankara, Turkey
| | - Mehmet Gumustas
- Institute of Forensic Sciences, Department of Forensic Toxicology, Ankara University, Ankara, Turkey
| | - Bora Baskak
- School of Medicine, Department of Psychiatry, Ankara University, Ankara, Turkey
| | - H Sinan Suzen
- Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Ankara University, Ankara, Turkey
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Oymak T, Dural E. Determination of sunset yellow, allura red, and fast green using a novel magnetic nanoadsorbent modified with Elaeagnus angustifolia based on magnetic solid-phase extraction by HPLC. BRAZ J PHARM SCI 2022. [DOI: 10.1590/s2175-97902022e20884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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Dural E, Shah UK, Pritchard D, Chapman KE, Doak SH, Jenkins GJS. Erratum to: The effect of chronic dosing and p53 status on the genotoxicity of pro-oxidant chemicals in vitro. Mutagenesis 2021; 36:388. [PMID: 34473828 DOI: 10.1093/mutage/geab029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Emrah Dural
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, SA2 8PP, U.K
- Sivas Cumhuriyet University, Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Sivas, Turkey
| | - Ume-Kulsoom Shah
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, SA2 8PP, U.K
| | - Demi Pritchard
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, SA2 8PP, U.K
| | - Katherine Emma Chapman
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, SA2 8PP, U.K
| | - Shareen Heather Doak
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, SA2 8PP, U.K
| | - Gareth James Scott Jenkins
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, SA2 8PP, U.K
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Dural E, Shah UK, Pritchard D, Chapman KE, Doak SH, Jenkins GJS. The effect of chronic dosing and p53 status on the genotoxicity of pro-oxidant chemicals in vitro. Mutagenesis 2020; 35:479-489. [PMID: 33259605 DOI: 10.1093/mutage/geaa024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 09/07/2020] [Indexed: 11/12/2022] Open
Abstract
In this study, we have studied the cytotoxicity and genotoxic potency of 3 pro-oxidants; H2O2, menadione and KBrO3 in different dosing scenarios, namely acute (1-day dosing) and chronic (5-days). For this purpose, relative population doubling (RPD%) and mononucleated micronucleus (MN) test were used. TK6 cells and NH32 were employed in in vitro experiments. In the study, the total acute dose was divided into 5 days for each prooxidant chemicals by dose fractionation (1/5th per day) method. Acute dosing was compared to chronic dosing. The oxidative stress caused by the exposure of cells with pro-oxidant chemicals to the cells was determined by an optimized 2',7'-dichlorofluorescein diacetate (DCFHDA) test method. The antioxidant levels of the cell lines were altered with buthionine sulfoxide (BSO) and N-acetyl cysteine (NAC), and the effect of antioxidant capacity on the MN formation in the cells was observed with this method. In the case of H2O2 and menadione, fractional dosing has been observed to result in lower toxicity and lower genotoxicity. But in the case of KBrO3, unlike the other 2 pro-oxidants, higher MN induction was observed with fractionated doses. DCFHDA test clearly demonstrated ROS induction with H2O2 and menadione but not with KBrO3. Unexpectedly, DCFHDA test demonstrated that KBrO3 did not cause an increase ROS levels in both acute and chronic dosing, suggesting an alternative ROS induction mechanism. It was also observed that, treatment with BSO and NAC, caused increasing and decreasing of MN fold change respectively, allowing further ROS specific mechanisms to be explored. Hence, dose fractionation expectedly caused less MN, cytotoxicity and ROS formation with H2O2 and menadione exposure, but not with KBrO3. This implies a unique mechanism of action for KBrO3 induced genotoxicity. Chronic dosing in vitro may be a valuable approach allowing better understanding of how chemicals damage DNA and pose human hazards.
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Affiliation(s)
- Emrah Dural
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, U.K
- Sivas Cumhuriyet University, Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Sivas, Turkey
| | - Ume-Kulsoom Shah
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, U.K
| | - Demi Pritchard
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, U.K
| | - Katherine Emma Chapman
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, U.K
| | - Shareen Heather Doak
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, U.K
| | - Gareth James Scott Jenkins
- In vitro Toxicology Group, Institute of Life Science, College of Medicine, Swansea University, Swansea, U.K
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Dural E. Determination of Selected Phthalates in Some Commercial Cosmetic Products by HPLC-UV. Comb Chem High Throughput Screen 2020; 23:1010-1022. [DOI: 10.2174/1386207323666200630113850] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 01/13/2020] [Accepted: 04/08/2020] [Indexed: 11/22/2022]
Abstract
Aim and scope:
Due to the serious toxicological risks and their widespread use,
quantitative determination of phthalates in cosmetic products have importance for public health.
The aim of this study was to develop a validated simple, rapid and reliable high-performance liquid
chromatography (HPLC) method for the determination of phthalates which are; dimethyl phthalate
(DMP), diethyl phthalate (DEP), benzyl butyl phthalate (BBP), di-n-butyl phthalate (DBP), di(2-
ethylhexyl) phthalate (DEHP), in cosmetic products and to investigate these phthalate (PHT) levels
in 48 cosmetic products marketing in Sivas, Turkey.
Materials and Methods:
Separation was achieved by a reverse-phase ACE-5 C18 column (4.6 x
250 mm, 5.0 μm). As the mobile phase, 5 mM KH2PO4 and acetonitrile were used gradiently at 1.5
ml min-1. All PHT esters were detected at 230 nm and the run time was taking 21 minutes.
Results:
This method showed the high sensitivity value the limit of quantification (LOQ) values
for which are below 0.64 μg mL-1 of all phthalates. Method linearity was ≥0.999 (r2). Accuracy and
precision values of all phthalates were calculated between (-6.5) and 6.6 (RE%) and ≤6.2 (RSD%),
respectively. Average recovery was between 94.8% and 99.6%. Forty-eight samples used for both
babies and adults were successfully analyzed by the developed method. Results have shown that,
DMP (340.7 μg mL-1 ±323.7), DEP (1852.1 μg mL-1 ± 2192.0), and DBP (691.3 μg mL-1 ± 1378.5)
were used highly in nail polish, fragrance and cream products, respectively.
Conclusion:
Phthalate esters, which are mostly detected in the content of fragrance, cream and nail
polish products and our research in general, are DEP (1852.1 μg mL-1 ± 2192.0), DBP (691.3 μg
mL-1 ± 1378.5) and DMP (340.7 μg mL-1 ±323.7), respectively. Phthalates were found in the
content of all 48 cosmetic products examined, and the most detected phthalates in general average
were DEP (581.7 μg mL-1 + 1405.2) with a rate of 79.2%. The unexpectedly high phthalate content
in the examined cosmetic products revealed a great risk of these products on human health. The
developed method is a simple, sensitive, reliable and economical alternative for the determination
of phthalates in the content of cosmetic products, it can be used to identify phthalate esters in
different products after some modifications.
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Affiliation(s)
- Emrah Dural
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Sivas Cumhuriyet University, Sivas, Turkey
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Dural E, Baskak NS, Özcan H, Kır Y, Başkak B, Süzen HS. Determination of Mirtazapine and Desmethyl Mirtazapine in Human Plasma by a New Validated HPLC Ultraviolet Method with a Simple and Reliable Extraction Method: Application to Therapeutic Drug Monitoring Study by 62 Real Patient Plasma. Iran J Pharm Res 2020; 19:18-30. [PMID: 32922465 PMCID: PMC7462492 DOI: 10.22037/ijpr.2019.14599.12519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Determination of mirtazapine (MRP) during psychopharmacotherapy in biological fluids is essential to achieve successful therapy, to avoid toxicity related to drug interactions, genetic variability, and poor compliance. A new, rapid, and sensitive high-performance liquid chromatography method has been developed in human plasma for the determination of MRP and N-desmethylmirtazapine (NDM) that is an active metabolite. The separation was achieved on a reverse-phase C18 250 x 4.6 mm i.d., ODS-3 column using programmed gradient elution at 40 °C. 20 mM potassium phosphate buffer (pH 3.9), acetonitrile, and triethylamine (75.0:24.9:0.1, v/v/v) were used as mobile phase A. Mobile phase B consisted of absolute acetonitrile. Clozapine was used as an internal standard. The method showed linearity with good determination coefficients (r2≥0.9981) for each analyte. Intra-day and interday assay precisions (RSD%) were found less than 3.4 and 2.9 for MRP and NDM, respectively. The intra-day and interday accuracy (RE%) of the method were calculated between (-2.8) and 5.5. A new extraction method was used in the study and an excellent recovery (average) values for MRP and NDM (94.4%, 106.6%, respectively) was obtained. The method was specific and sensitive as the limit of detection (LOD) were 0.17 for MRP and 0.15 ng/mL for NDM. This method was applied properly to plasma samples taken from patients receiving MRI (n = 62) treated with 15-30 mg / day. The obtained and statistically evaluated plasma MRP and NDM levels which were 28.6 ± 13.8 and 12.3 ± 6.5 (mean ± SD). The described procedure is relatively simple, precise, and applicable for routine therapeutic drug monitoring especially in psychiatry clinics and toxicology reference laboratories.
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Affiliation(s)
- Emrah Dural
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Sivas Cumhuriyet University, Sivas, Turkey
| | - Nilay Sedes Baskak
- Department of Psychiatry, Yenimahalle Research and Training Hospital, Ankara Yıldırım Beyazıt University, Ankara, Turkey
| | - Hatice Özcan
- Department of Forensic Toxicology, Institute of Forensic Sciences, Ankara University, Ankara, Turkey
| | - Yağmur Kır
- Department of Psychiatry, Faculty of Medicine, Ankara University, Ankara, Turkey
| | - Bora Başkak
- Department of Psychiatry, Faculty of Medicine, Ankara University, Ankara, Turkey
| | - Halil Sinan Süzen
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Ankara University, Ankara, Turkey
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Ozdemir F, Dural E, Baskak NS, Kır Y, Baskak B, Suzen HS. The Association of CYP2D6*4 and POR*28 Polymorphisms on Mirtazapine Plasma Level in Subjects with Major Depressive Disorder and Anxiety Disorders. Comb Chem High Throughput Screen 2020; 23:1032-1040. [PMID: 32238137 DOI: 10.2174/1386207323666200402081512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 01/30/2020] [Accepted: 02/13/2020] [Indexed: 11/22/2022]
Abstract
AIMS AND OBJECTIVE The plasma level of mirtazapine (MIR) varies between individuals primarily depending on the differences in metabolism during pharmacotherapy. CYP2D6 takes the role as a major enzyme in MIR metabolism and POR enzyme donates an electron to CYP2D6 for its activity. Single nucleotide polymorphisms in the genes encoding pharmacokinetic enzymes may cause changes in enzyme activity, leading to differences in metabolism of the drug. Our aim was to assess the influence of CYP2D6*4 and POR*28 polymorphisms on MIR plasma levels in Turkish psychiatric patients. MATERIALS AND METHODS The association between genetic variations and plasma level of MIR was investigated on 54 patients. CYP2D6*4 and POR*28 polymorphisms were analysed using Polymerase Chain Reaction- Restriction Fragment Length Polymorphism (PCR-RFLP) and plasma MIR levels were measured using HPLC. RESULTS Allele frequencies of CYP2D6*4 and POR*28 were 0.11 and 0.39, respectively in the study population. The results showed that CYP2D6*4 allele carriers have higher C/D MIR levels while POR*28 allele carriers have lower C/D MIR levels. Combined genotype analyses also revealed that individuals with CYP2D6*1/*1 - POR*28/*28 genotype have a statistically lower C/D MIR level (0.95 ng/ml/dose) when compared with individuals with CYP2D6*1/*1 - POR*1/*1 genotype (1.52 ng/ml/dose). CONCLUSION Our results indicate that CYP2D6*4 and POR*28 polymorphisms may have a potential in the explanation of differences in plasma levels in MIR treated psychiatric patients. A combination of these variations may be beneficial in increasing drug response and decreasing adverse drug reactions in MIR psychopharmacotherapy.
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Affiliation(s)
- Fezile Ozdemir
- Department of Forensic Toxicology, Institute of Forensic Sciences, Ankara University, Ankara, Turkey
| | - Emrah Dural
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Cumhuriyet University, Sivas, Turkey
| | - Nilay Sedes Baskak
- Department of Psychiatry, Yıldırım Beyazıt University Yenimahalle Research and Training Hospital, Ankara, Turkey
| | - Yağmur Kır
- Department of Psychiatry, School of Medicine, Ankara University, Ankara, Turkey
| | - Bora Baskak
- Department of Psychiatry, School of Medicine, Ankara University, Ankara, Turkey
| | - Halt S Suzen
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Ankara University, Ankara, Turkey
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Dural E. Investigation of the Presence of Sildenafil in Herbal Dietary Supplements by Validated HPLC Method. Turk J Pharm Sci 2020; 17:56-62. [PMID: 32454761 DOI: 10.4274/tjps.galenos.2018.91249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 10/25/2018] [Indexed: 12/01/2022]
Abstract
Objectives As the first FDA-approved phosphodiesterase type 5 inhibitor, sildenafil (SDF) is widely used in the treatment of erectile dysfunction due to its strong pharmacodynamic activity. Since many food supplements are now involved in illegal adulteration, the presence of SDF in food supplements is very important because of their toxicological risks. In this study a simple fast, reliable high-performance liquid chromatography method with ultraviolet (UV) detector has been developed and validated for SDF analysis in herbal dietary supplements (HDSs). Materials and Methods 10 mM phosphate buffer containing 0.1% triethylamine (pH 3.5) and acetonitrile (65:35, v/v), as mobile phase was applied isocratically to a reverse phase C18 analytical (4.6×250 mm, 5 μm) column. Chromatographic separation was achieved by a C18 reverse-phase analytical column 4.6×250 mm, 5 μm particle size, using acetonitrile, with 10 mM phosphate buffer containing 0.1% triethylamine (65:35, v/v, pH 3.5) as a mobile phase. The mobile phase flow rate was 1 mL min-1 and the column temperature was 35°C. The UV detector was set at 293 nm. The liquid-liquid extraction method used in the study provided a simple and practical method for the recovery of SDF in HDSs and their obtained values ranged from 87.6 to 111.7%. Results The method showed linearity with an excellent correlation coefficient (r2>0.999). Moreover, it was specific and sensitive with the limit of quantification, 6.5 ng mL-1. Intraday and interday method precision was ≤8.2 (relative standard deviation %). Intraday and interday method accuracy was between -4.0 and 7.1 (RE%). The method was strong according to the robustness test results obtained from UV detection, mobile phase buffer pH, column temperature, and flow rate changes. The described procedure was simple, fast, precise, and feasible for routine adulteration analysis of SDF, especially in food control or toxicology laboratories. This method was successfully applied to 50 individual solid and liquid form HDSs. Conclusion The results showed that 37 out of 50 samples of HDSs (represented 74.0%) examined contained SDF between 0.01 and 465.47 mg/g, 150.87±127.48 (mean ± standard deviation), which could lead to serious health problems and might even be fatal for consumers. The described procedure was found to be simple, rapid, precise and feasible for routine adulteration analysis of SDF, especially in food control or toxicology laboratories.
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Affiliation(s)
- Emrah Dural
- Sivas Cumhuriyet University, Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Sivas, Turkey
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Dural E, Çelebi S, Bolayır A, Çiğdem B. Development and validation of a new HPLC method for valproic acid determination in human plasma and its application to a therapeutic drug monitoring study. Maced Pharm Bull 2020. [DOI: 10.33320/maced.pharm.bull.2020.66.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The aim of this study was to develop a new, simple and reliable high performance liquid chromatography (HPLC) method for analysis of valproic acid (VPA) in human plasma and apply to it to a therapeutic drug monitoring study. Also, the relationship between plasma-VPA concentrations and the amount of VPA used by patients was aimed to be evaluated.
Plasma samples (0.25 mL) were precipitated with the same volume of acetonitrile and after centrifugation, aliquots were applied to a C18 column (250 mm x 4.6 mm). Mobile phase was prepared with phosphate buffer and acetonitrile (47.5:52.5, v/v). The flow-rate was 1.2 mL/min.
Accuracy was between -2.9 and 3.2% and precision was ≤6.6%. Method was specific and sensitive with a detection limit of 2.2 µg/mL and the average recovery was 94.3%. Calibration curve was linear (r2>0.9968) from 10 to 150 µg/mL. Plasma-VPA levels of the epileptic patient population (n=33) treated with VPA between 0.5 and 1.5 g/day were also determined.
Patient plasma-VPA concentrations ranged from 2.9 to 166.4 µg/g/mL (56.3±38.8). High RSD% (68.8%) was observed in dose-rated plasma-VPA results. Moreover, VPA plasma levels were found to be outside the recommended treatment range in 30.3% of the patients examined. The procedure described was found to be relatively simple, precise, and applicable for routine therapeutic drug monitoring (TDM) especially in neurology clinics or in toxicology reference laboratories.
The high standard deviation (SD) observed in the dose depended plasma-VPA values of the volunteers proved the importance of TDM during the use of this drug. The results showed that for rational drug use, it is important to identify individual polymorphisms in the CYP2C9, CYP2A6 and CYP2B6 subtypes responsible for VPA metabolism, and to rearrange drug doses taking these enzyme activities into account.
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Affiliation(s)
- Emrah Dural
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Sivas Cumhuriyet University, Sivas, Turkey
| | - Seniha Çelebi
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Sivas Cumhuriyet University, Sivas, Turkey
| | - Aslı Bolayır
- Department of Neurology, Faculty of Medicine, Sivas Cumhuriyet University, Sivas, Turkey
| | - Burhanettin Çiğdem
- Department of Neurology, Faculty of Medicine, Sivas Cumhuriyet University, Sivas, Turkey
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Eruygur N, Dural E. Determination of 1-Deoxynojirimycin by a developed and validated HPLC-FLD method and assessment of In-vitro antioxidant, α-Amylase and α-Glucosidase inhibitory activity in mulberry varieties from Turkey. Phytomedicine 2019; 53:234-242. [PMID: 30668403 DOI: 10.1016/j.phymed.2018.09.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 04/12/2018] [Accepted: 09/03/2018] [Indexed: 05/27/2023]
Abstract
BACKGROUND Morus alba and Morus nigra leaves which have been widely used as herbal teas in Anatolian region of Turkey, were extracted twice by 50 mM HCI solution, derivatized with 9-fluorenylmethyl chloroformate and analyzed by reversed phase HPLC equipped with a fluorescence detector. HYPOTHESIS/PURPOSE This study was performed to determine the main antidiabetic active compounds 1-deoxynojirimycin by HPLC method and evaluate the in-vitro antioxidant and antidiabetic activity of ethanol extracts prepared from Morus alba L. and Morus nigra leaves. STUDY DESIGN A reliable simple, and rapid high-performance liquid chromatographic (HPLC) method for the determination of 1-deoxynojirimycin in M. alba L. and M. nigra leaves with fluorimetric detection after pre-column derivatization with 9-fluorenylmethyl chloroformate was developed. In addition, the chemical composition of ethanol extract of mulberry leaves was analyzed with GC-MS. METHODS Separation and quantitation were performed on C18, 250 × 4.6 mm, 5 µm analytical column. Mobile phase consisted of acetonitrile and 0.1% acetic acid solution (1:1, v/v) was performed applied to the column 1.0 ml/min flow rate at 26 °C. Potential antioxidant activity of ethanol extract of different mulberry varieties were evaluated by DPPH, and ABTS radical scavenging assay as well as total phenol and flavonoid content were determined. In addition, α-amylase and α-glucosidase activity was determined by 96-well plate method to evaluate the probable antidiabetic potential use of Turkish mulberry leaves. RESULTS The isocratic HPLC method showed excellent correlation coefficient (r2 = 0.9985) between 0.3 and 30 µg/ml calibration points. The method was specific and sensitive with detection and quantification limits of 1.07 and 3.27 ng/ml, respectively. Intraday and interday method precision (n = 5) were < 7.3 (RSD%). Intraday and interday method accuracy (n = 5) were between 3.77 and (-8.35) (RE%). The average method recovery (n = 3) was 102.5%. The results showed that the content of 1-deoxynojirimycin in leaves of Morus alba L. was 0.103% (n = 3), and in leaves of M. nigra L. was 0.102%. 2-hexadecen-1-ol, oleamide, 2-propenoic acid, and cyclododecane were identified as the major compounds by GC-MS in the ethanol extract of mulberry leaves. CONCLUSION The obtained robustness values from emission and excitation detection, mobile phase ingredients and flow rates changes showed that method was very strong. This work contributes to the knowledge of antioxidant and antidiabetic properties of Morus species, thus may be provide useful data in evaluation of food products and pharmaceutical preparations produced from Morus species.
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Affiliation(s)
- Nuraniye Eruygur
- Department of Pharmacognosy, Cumhuriyet University Faculty of Pharmacy, Sivas, Turkey; Department of Pharmacognosy, Selcuk University Faculty of Pharmacy, Konya, Turkey.
| | - Emrah Dural
- Department of Pharmaceutical Toxicology, Cumhuriyet University Faculty of Pharmacy, Sivas, Turkey
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Kozluca H, Dural E, Karabıyıkoğlu G, Söylemezoğlu T. Pulmonary functional parameters and blood cotinine level in chronic obstructive pulmonary disease. Tuberk Toraks 2019; 66:317-324. [PMID: 30683027 DOI: 10.5578/tt.66932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Introduction Smoking is the leading cause of chronic obstructive pulmonary disease (COPD) and cotinine is reliable marker of tobacco exposure. We aimed to investigate the relationship between pulmonary function tests (FVC%, FEV1, FEV1/FVC and FEF25-75%), smoking history and blood cotinine levels in healthy volunteers as a control and patients who have COPD in our study. Materials and Methods One hundred and two COPD patients and 106 healthy volunteers who admitted to our institution were included. Spirometric investigations of the patients and volunteers were performed. A simple, rapid and reliable gas chromatography-mass spectrometry (GC-MS) method was used for determination of cotinine levels in blood samples. Result The cut-off value of cotinine was determined as 41.12 ng/mL (97.2% sensitivity and 100% specificity). A significant relationship was observed between average pack-year and cotinine level in current smoker group (p< 0.05). The mean cotinine levels were 6.1, 8.8, and 467.0 ng mL-1 in never smokers, ex-smokers and current smokers, respectively. No relationship was observed between cotinine level and FVC%, FEV1% and FEV1/FVC (p> 0.05). In patient group, there was also no relationship between FEF25-75% and cotinine level however, in control group-smokers a negative correlation was found (p< 0.05; r= -0.372). Conclusions We observed once again with our study that cotinine is a reliable marker of tobacco exposure. The most obvious result is the negative correlation between FEF25-75% value and cotinine level and this result may be caused by the effect of smoking in the peripheral airways at early stages of COPD.
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Affiliation(s)
- Hatice Kozluca
- Department of Chest Diseases, Faculty of Medicine, Ankara University, Ankara, Turkey
| | - Emrah Dural
- Department of Forensic Toxicology, Institute of Forensic Sciences, Ankara University, Ankara, Turkey
| | | | - Tülin Söylemezoğlu
- Department of Forensic Toxicology, Institute of Forensic Sciences, Ankara University, Ankara, Turkey
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Dural E. Investigation of the presence of sildenafil in herbal dietary supplements by validated HPLC method. Turk J Pharm Sci 2019. [DOI: 10.4274/tjps.91249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Eruygur N, Dural E. α-Glucosidase and α-amylase inhibitory activities of crude ethanol extract and fractions of endemic Hyacinthella acutiloba K. Press. & Wendelbo bulbus. Toxicol Lett 2017. [DOI: 10.1016/j.toxlet.2017.07.248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Dural E. Determination of patulin levels in apple juices by HPLC-UV. Toxicol Lett 2017. [DOI: 10.1016/j.toxlet.2017.07.546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Dural E, Mergen G, Mergen G, Söylemezoğlu T. Optimization and Validation of an HPLC-UV Method for Analysis of Clozapine and its Major Metabolites in Human Plasma. Turk J Pharm Sci 2015. [DOI: 10.5505/tjps.2015.68077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Kayaalti Z, Soylemez E, Bacaksiz A, Dural E, Yilmaz H, Soylemezoglu T. Determination of lymphocyte DNA damage by use of comet assay in painters. Toxicol Lett 2012. [DOI: 10.1016/j.toxlet.2012.03.202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Dural E, İşiner B, Boran E, Söylemezoğlu T. Validation of GC–MS method for determination of nicotine and cotinine in plasma and urine. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Dural E, Koç B, Kayaaltı Z, İşiner B, Boran E, Söylemezoğlu T. Determination of phthalate levels in maternal placenta and urine. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mergen G, Dural E, Soylemezoglu T. Validation of GC head space method for the determination of toluene: Application to exposed spray paint workers. Toxicol Lett 2010. [DOI: 10.1016/j.toxlet.2010.03.928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Dural E, Mergen G, Soylemezoglu T. Determination and quantitation of clozapine and its metabolites in plasma by HPLC. Toxicol Lett 2009. [DOI: 10.1016/j.toxlet.2009.06.785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Pentylenetetrazol-induced seizures in rats lead to the breakdown of the blood-brain barrier. We compared the disruption of the blood-brain barrier during epileptic seizure in untreated rats and in rats treated with vitamin E or selenium. The rats were supplemented with nontoxic doses of sodium selenite (4 pp) in drinking water for 3 months, or vitamin E (70 mg/kg) was given intraperitoneally for 30 min before the pentylenetetrazole injection. Evans-blue was used as a blood-brain barrier tracer and was given intravenously at a dose of 4 ml/kg of a 2% solution. The rats were divided into four experimental groups. Group I: control (n = 24); Group II: pentylenetetrazole-induced seizure (n = 12); Group III: vitamin E injected + seizure (n = 12); Group IV: Selenium supplemented + seizure (n = 12). The rats subjected to epileptic seizures showed Evans-blue albumin extravasations especially in the thalamic nuclei, brainstem, occipital, and frontal cortex. Mean values for Evans-blue dye were found to be 0.28 +/- 0.04 mg % brain tissue in control rats and 1.6 +/- 0.2 mg % brain tissue after epileptic seizures (P < 0.01). The magnitude of distribution of the blood-brain barrier during epileptic seizures was significantly less in rats treated with vitamin E or selenium. The mean value for Evans-blue dye was found to be 1.2 +/- 0.1 mg % brain tissue in selenium supplemented rats and 1.2 +/- 0.1 mg % brain tissue in vitamin E injected rats after epileptic seizures. This difference between treated and untreated animals was found to be significant (P < 0.05). The findings of the present study suggest that free radicals contribute to disruption of the blood-brain barrier during pentylenetetrazol-induced seizures.
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Affiliation(s)
- B Oztaş
- Department of Physiology, Istanbul Faculty of Medicine, University of Istanbul, Capa Istanbul, Turkey.
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Abstract
We have examined the effect of antioxidants (vitamin E, and selenium) on the blood-brain barrier permeability during adreneline-induced acute hypertension in the female rats. The rats supplemented with nontoxic doses of sodium selenite in drinking water for three months or vitamin E was given intraperitoneally before adrenaline-induced acute hypertension. Evans-blue was used as a blood-brain barrier tracer. Mean values for Evans-blue dye were found to be 0.28 +/- 0.04 microg/g tissue in control animals and 1.0 +/- 0.2 microg tissue after adrenaline-induced acute hypertension (p < .01). Rats pretreated with selenium or vitamin E also showed macroscopic leakage of Evans-blue albumin after adrenaline injection i.e., there was no significant difference in protein extravasation between untreated and treated animals (p > .5). The mean value for Evans-blue dye was found to be 1.0 +/- 0.2 microg/g tissue in acute hypertension group, 0.9 +/- 0.2 microg/g tissue in selenium pretreated animals and 1.0 +/- 0.2 micrg/g tissue vitamin E injected animals after acute hypertension. The results show that antioxidants did not influence the blood-brain barrier breakdown during adrenaline-induced acute hypertension.
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Affiliation(s)
- B Oztaş
- Department of Physiology, Istanbul Faculty of Medicine, Turkey
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