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Öğe Chemical composition of essential oil by SPME and evaluation of antimicrobial, antioxidant activities of quercus inectoria GALL(Univ Life Sciences Lublin, 2021) Ceylan, Şule; Yardımcı, Semih Şehmuz; Camadan, Yasemin; Saral, Özlem; Özşen Batur, ÖzgeQuercus infectoria galls have been utilized to cure widespread illnesses. In line with it, this paper aims to investigate the chemical combination of the volatile oils obtained from galls of Q. infectoria and evaluate their antioxidant and antimicrobial features. The volatiles of Q. infectoria has been isolated by solid-phase microextraction (SPME). The compositions of the volatiles were revealed via gas chromatography coupled with mass spectrometry (GC-MS). Twenty-nine substances have been characterized in the volatile essential oil of Q. infectoria. The major components of the volatile oil were (Z)-Anethol 28.55%, pentadecanolide (26.44%), diethyl phthalate (6.46%), and acetoin (5.66%). Q. infectoria showed good-moderate antimicro-bial (Staphylococcus aureus, Streptomyces griseolus, Pseudomonas citronellosis) and antifungal (Candida glabrata, Candida krusei) activities against to test microorganisms with MIC value 250 ?g/mL and 125 ?g/mL, respectively. Also, total flavonoid and total polyphenol amounts were found for Q. infectoria, and our to-tal polyphenol result (342.87 mg GAE/g) was found higher than the studies in the literature. At the same time Q. infectoria has been observed to have high antioxidant activity according to DPPH, FRAP, and CUPRAC assays. Especially it exhibited excellent DPPH activity for the IC50 rate of 0.002 ?g/mL which is higher than the standard Trolox (IC50 = 0.008 ?g/mL). This study is important because it is the first one, which reports the determination of essential oil, total polyphenol, flavonoid contents, antioxidant, and antimicrobial activities all together for Q. infectoria.Öğe Chemical composition, antimicrobial, and antioxidant activities of medicinal plants nutsedge and fenugreek(North Carolina State University, 2022) Ceylan, Şule; Camadan, Yasemin; Saral, Özlem; Özşen Batur, ÖzgePurple nutsedge roots (Cyperus rotundus L.) and fenugreek seeds (Trigonella foenum-graecum L.) have been traditionally used as food and to treat common ailments. After extraction by solid-phase microextraction (SPME), the chemical structure of the revealed volatile fractions was researched with gas chromatography with mass spectrometry (GC-MS). The determined substances of the C. rotundus were pentadecanolide (72.0%), palmitic acid (8.2%), 16-hydroxy-6-hexadecenoic acid omega lactone (4.4%), and (Z)-anethol (3.9%). Most of the identified compounds of the T. foenum-graecum were pentadecanolide (61.3%) and (Z)-anethol (16.5%). The C. rotundus showed good antifungal activity against the yeast strands of Candida albicans and Candida krusei. Minimum inhibitory concentration (MIC) numbers were 250 and 125 µg/mL, respectively. However, the T. foenum-graecum seeds did not show any effect against the test microorganisms. The C. rotundus roots in particular exhibited good 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity with an IC50 number of 0.91 mg/mL.Öğe The determination of the carbonic anhydrases activators in vitro effect of mixed donor crown ethers(Wiley, 2018) Akkemik, Ebru; Çiçek, Baki; Camadan, Yasemin; Çalışır, Ümit; Onbaşıoğlu, ZekaiCarbonic anhydrases (CAs) play an important function in various physiological and pathological processes. Therefore, many researchers work in this field in order to design and synthesize new drugs. Both inhibitors and activators of CAs, which are associated with the diagnosis and treatment of many diseases, are very important. The emergence of the use of CA activators in the treatment of Alzheimer has led many scholars to work on this issue. In this study, CA activators and inhibitors are determined. The crown ethers compounds (1, 2, 3, 6, 7, 8, and 9) were found to cause activation on enzyme activities of hCA I and II. The AC50 values on hCA I and II of the compounds are in the range of 4.6565-374.979 ?M. The 4 (IC50 ; 1.301 and 3.215 ?M for hCA I and II) and 5 (IC50 ; 73.96 and 378.5 ?M for hCA I and II) compounds were found to cause inhibition on enzyme activities of hCA I and II.Öğe In vitro and in silico evaluation of some plant extracts and phytocompounds against multidrug-resistant Gram-negative bacteria(Springer, 2021) Aydemir, Eda; Sarıyer, Emrah; Akyıldız, Esma; Özad Düzgün, Azer; Camadan, Yasemin; Saral Sarıyer, AyşegülThe spread of multidrug-resistant Gram-negative (MDR) bacteria is a global public health problem, as infections caused by MDR Gram-negative bacteria are difcult to treat. New antibiotic agents need to be developed to overcome this problem, and phytochemicals show promise at this point. In this study, methanol extracts were prepared from cinnamon, thyme, nettle, white tea, rosehip, and antibacterial activity of the methanol extracts was studied against two MDR Gram-Negative bacteria (K. pneumoniae and A. baumannii) by broth microdilution method. The MICs of methanol extracts of cinnamon, rosehip, thyme, white tea for A. baumannii were found as 0.015125 g/ml, 0.07825 g/ml, 0.030625 g/ml, 0.00796875 g/ml, respectively. It was found that only cinnamon methanol extract had antibacterial activity in the used extract concentrations against K. pneumoniae and the MIC value was 0.0605 g/ml. The efects of plant methanol extract with antibacterial activity and imipenem combinations were studied in vitro using the checkerboard method. The FIC Indexes were obtained from the checkerboard results and it was observed that the combination of methanol extract and imipenem showed an antagonistic or additive/indiferent efect but not a synergistic efect. We evaluated the binding afnity of epigallocatechin 3-gallate, quercetin, cinnamaldehyde, carvacrol, and thymol phytocompounds using in silico methods, which are well known as a phytocompounds in white tea, cinnamon, thyme, nettle, and rosehip and have antibacterial activities. The results suggested that these phytocompounds should be supported with in vivo and in vitro experiments to investigate their potential for being inhibitor candidates.Öğe Investigation of in vitro and in silico effects of some novel carbazole Schiff bases on human carbonic anhydrase isoforms I and II(Taylor & Francis Inc, 2021) Camadan, Yasemin; Çiçek, Baki; Adem, Şevki; Çalışır, Ümit; Akkemik, EbruCarbonic anhydrases (CAs, EC4.2.1.1) are metalloenzymes that catalyse reversible hydration reaction of carbon dioxide to bicarbonate and protons. In recent years, there has been a great interest in inhibitors/activators of carbonic anhydrase isoenzymes. Therefore, we investigated the effects of four different carbazole Schiff base derivatives, which are believed to have a potential to be used as a drug, on human carbonic anhydrase (hCA) isoenzymes I and II under in vitro conditions. The IC50 values of carbazole Schiff base derivatives were found to be in the range of 32.09-151.2 ?M for hCA isoenzyme I and 21.82-40.54 ?M for hCA isoenzyme II. Among all compounds, (E)-3-(((9-Octyl-9H-carbazole-3-yl)imino)methyl)benzene-1,2-diol (C3) had the strongest inhibitory effect on hCA isoenzyme II. It was determined that 2,3,4-trimethoxy and 4-hydroxy phenyl containing carbazole compounds have selective inhibition against hCA II isoenzyme. Docking studies were performed against hCA I and II receptors using induced-fit docking method. The compounds had affinity scores varying from -7.74 ± 0.27 to -6.27 ± 0.07 kcal/mol for hCA I and from -8.04 ± 0.17 to -7.27 ± 0.18 kcal/mol for hCA II.Communicated by Ramaswamy H. Sarma.Öğe Investigation of the effects of 1,2,4-triazole and thiazole ring-containing hybrid molecules on carbonic anhydrase I and II(John Wiley and Sons Inc, 2024) Camadan, Yasemin; Akkemik, Ebru; Güller, Pınar; Ceylan, Şule; Özdemir, HasanCarbonic anhydrase (CA, EC 4.2.1.1) is an enzyme that catalyzes the reversible reaction of carbon dioxide to bicarbonate and a proton under physiological conditions. Pharmaceutical research has gained importance since the design of novel compounds that inhibit CA I–II isoenzymes has a promising approach for pharmacological intervention in many diseases. Triazole derivatives have attracted attention due to their chemotherapeutic, antifungal, antiviral, antibiotic, analgesic, and antifungal activities. Therefore, in this study, the effect of 1,2,4-triazole and thiazole ring-containing compounds on human carbonic anhydrase I (hCA I) and II (hCA II) isoenzymes were investigated in vitro. For this purpose, hCA I and hCA II isoenzymes were purified by Sepharose-4B affinity column chromatography. Estimation of inhibition mechanism and drug-likeness characteristics of compounds were also determined using molecular docking simulation. The inhibitory effects of ten compounds were investigated. Activity vs. concentration graphs were prepared for each compound and IC50 values or AC50 were calculated from these graphs. It was revealed that some of the compounds exhibited selective inhibition on carbonic anhydrase isoenzymes. The studied compounds are considered to be drug candidates.Öğe Milk lipid and protein profiles of abkhazian and kackar goats(Bogor Agricultural Univ, 2018) İskender, Hatice; Kaynar, Özgür; Hayırlı, Armağan; Camadan, YaseminFat and protein profiles of milk of Abkhazian and Kackar goats, Caucasian breeds, were compared in this study. The milk samples (n= 60) from 60 Abkhazian and Kackar goats were subjected to assessments of lipid profile using the high performance thin layer chromatography and protein profile using the sodium dodecyl sulphate polyacrylamide gel electrophoresis. The milk lipid and protein contents as well as their fractions were compared using student t-test. Total lipid content was 4.23 +/- 0.022 g/dl and 3.44 +/- 0.026 g/dl for Abkhazian and Kackar goat milk (P<0.0001). Milk triacylglycerol, free fatty acid and diacylglycerol fractions were different (P<0.05), but the cholesterol fraction was similar. Total protein content was 3.94 g/dl and 3.75 g/dl for Abkhazian and Kackar goat milk (P<0.007). The milk fat globule membrane protein mucine1 and xhantine oxidase, a-lactalbumin, a-casein, and.-casein fractions were different (P<0.05). In conclusion, milk lipid and protein profile differs between Abkhazian and Kackar goats despite living in the same ecosystem. Differences in milk lipid and protein profile could be pertinent to human nutrition and health.Öğe Purification and characterization of dihydropyrimidine dehydrogenase enzyme from sheep liver and determination of the effects of some anaesthetic and antidepressant drugs on the enzyme activity(Taylor & Francis Inc, 2016) Camadan, Yasemin; Özdemir, Hasan; Gülçin, İlhamiDihydropyrimidine dehydrogenase (DPD, E.C. 1.3.1.2) was purified from sheep liver with a yield of 16.7%, purification fold of 407.5 and specific activity of 0.705 EU/mg proteins. The purification procedure consisted of ammonium sulphate fractionation, DEAE ion exchange chromatography and 2',5'-ADP Sepharose-4B affinity chromatography. The molecular weight determined by SDS-PAGE and was found 111 kDa. Optimum pH, ionic strength temperature and stable pH were determined as 8.0, 0.9 mM, 50 degrees C and 6.0, respectively. The kinetic parameters (K-m and V-max) of the enzyme were determined with NADPH as 22.97 mu M and 0.17 EU/mL, respectively. The same parameters were determined with uracil as 17.46 mu M and 0.14 EU/mL, respectively. Additionally, in vitro inhibitory effects of some antidepressant drugs including escitalopram, fluoxetine, mirtazapine, haloperidol and some anaesthetic drugs including propofol and lidocaine were investigated against DPD. In addition, IC50 values for each active drug obtained for escitalopram, fluoxetine, mirtazapine, haloperidol, propofol and lidocaine were determined as 1736.11, 13.24, 86.65, 99.03, 0.21 and 15.07 mu M, respectively.Öğe Searching for new natural inhibitors of acetylcholinesterase enzyme(Cumhuriyet Üniversitesi, 2022) Camadan, Yasemin; Akkemik, EbruAcetylcholinesterase enzyme (AChE) is the enzyme that catalyzes the hydrolysis of the neurotransmitter acetylcholine to choline. Inhibitors of this enzyme (AChE-i) are used to treat Alzheimer's, a neurodegenerative disease. Due to the side effects of the drugs used, there has been an increased interest in investigating the inhibitory potentials of natural products which are presumed to have fewer side effects. For this purpose, the inhibitory effects of highland honey, chestnut honey, royal jelly and the seeds of peach, cherry, plum and apricot on human erythrocyte AChE enzyme was investigated in vitro in the present study. Extracts of the seeds and bee products were prepared in ethanol solvent. In order to determine the inhibitory effect of the extracts, the inhibition concentration (IC50) and Ki values which cause 50% inhibition of the enzyme were calculated using the Ellman method. It was found that among the natural product extracts studied, peach seed had the highest inhibition level (IC50 value 0.05708 mg/ml). IC50 values of highland honey, royal jelly, plum seed and apricot seed were determined as 0.2555 (mg/mL), 0.300 (mg/mL), 0.7049 (mg/mL) and 0.4544 (mg/mL) respectively.Öğe Secondary sulfonamides as effective lactoperoxidase inhibitors(MDPI, 2017) Köksal, Zeynep; Kalın, Ramazan; Camadan, Yasemin; Usanmaz, Hande; Almaz, Züleyha; Gülçin, İlhami; Ğökçe, Taner; Gören, Ahmet Ceyhan; Özdemir, HasanSecondary sulfonamides (4a–8h) incorporating acetoxybenzamide, triacetoxybenzamide, hydroxybenzamide, and trihydroxybenzamide and possessing thiazole, pyrimidine, pyridine, isoxazole and thiadiazole groups were synthesized. Lactoperoxidase (LPO, E.C.1.11.1.7), as a natural antibacterial agent, is a peroxidase enzyme secreted from salivary, mammary, and other mucosal glands. In the present study, the in vitro inhibitory effects of some secondary sulfonamide derivatives (4a–8h) were examined against LPO. The obtained results reveal that secondary sulfonamide derivatives (4a–8h) are effective LPO inhibitors. The Ki values of secondary sulfonamide derivatives (4a–8h) were found in the range of 1.096 × 10?3 to 1203.83 µM against LPO. However, the most effective inhibition was found for N-(sulfathiazole)-3,4,5-triacetoxybenzamide (6a), with Ki values of 1.096 × 10?3 ± 0.471 × 10?3 µM as non-competitive inhibition.Öğe Synthesis, characterizations of aryl-substituted dithiodibenzothioate derivatives, and investigating their anti-Alzheimer's properties(Taylor and Francis Ltd., 2021) Çalışır, Ümit; Camadan, Yasemin; Çiçek, Baki; Akkemik, Ebru; Eyüpoğlu, Volkan; Adem, ŞevkiThe main objective of the present study was to synthesize potential inhibitor/activators of AChE and hCA I-II enzymes, which are thought to be directly related to Alzheimer's disease. Dithiodibenzothioate compounds were synthesized by thioesterification. Six different thiolate compounds produced were characterized by 1H-, 13C-NMR, FT-IR, LC-MS/MS methods. HOMO-LUMO calculations and electronic properties of all synthesized compounds were comprehensively illuminated with a semi-empirical molecular orbital (SEMO) package for organic and inorganic systems using Austin Model 1 (AM1)-Hamiltonian as implemented in the VAMP module of Materials Studio. In addition, the inhibition effects of these compounds for AChE and hCA I-II in vitro conditions were investigated. It was revealed that TE-1, TE-2, TE-3, TE-4, TE-5, and TE-6 compounds inhibited the AChE under in vitro conditions. TE-1 compound activated the enzyme hCA I while TE-2, TE-3 TE-4 compounds inhibited it. TE-5 and TE-6, on the other hand, did not exhibit a regular inhibition profile. Similarly, TE-1 activated the hCA II enzyme whereas TE-2, TE-3, TE-4, and TE-5 compounds inhibited it. TE-6 compound did not have a consistent inhibition profile for hCA II. Docking studies were performed with the compounds against AChE and hCA I-II receptors using induced-fit docking method. Molecular Dynamics (MD) simulations for best effective three protein-ligand couple were conducted to explore the binding affinity of the considered compounds in semi-real in-silico conditions. Along with the MD results, TE-1-based protein complexes were found more stable than TE-5. Based on these studies, TE-1 compound could be considered as a potential drug candidate for AD. Communicated by Ramaswamy H. Sarma
