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Öğe A preliminary study of fumaric acid, called allomaleic acid, as a pharmaceutical antimicrobial compound(2024) Unver, TubaThe emergence of antimicrobial resistance in microorganisms and the adverse effects associated with antibiotic use have necessitated the exploration of new, natural substances for antimicrobial treatments. Fumaric acid, or allomaleic acid, is a natural bioactive compound primarily derived from plant-based products. Fumaric acid has potential analgesic, anti-inflammatory, antioxidant, anti-psoriatic, chemopreventive, immunomodulatory, and neuroprotective properties. So far, studies on the antimicrobial activity of fumaric acid have used a plant ingredient. The antimicrobial activity was attributed to fumaric acid because it was detected in large amounts in herbal products. In this preliminary study, the antibacterial and antifungal properties of pure fumaric acid (99+%) were determined by the microdilution method. As a result of the antimicrobial study, the Minimum Inhibitory Concentration (MIC) values of fumaric acid against Candida tropicalis, Candida krusei, Candida albicans, Candida glabrata, and Candida parapsilosis were 9.375, 37.5, 4.687, 4.687, and 1.172 mg/mL, respectively. Moreover, bacterial cells were found to be approximately one hundred times more sensitive to fumaric acid than Candida cells. The MIC values of fumaric acid against Klebsiella pneumoniae, Escherichia coli, Pseudomonas aeruginosa, and Enterobacter aerogenes were determined as 150 µg /mL, and against Staphylococcus aureus was 75 µg /mL. These results showed that pure fumaric acid has a potent inhibitory effect against pathogenic or opportunistic microorganisms. Its unique properties and potential as an antimicrobial agent make it a compelling study area. Therefore, the usability of fumaric acid in the pharmacotherapeutic field is promising for future advanced in vivo studies.Öğe Anti-infective effect of Aquilaria malaccensis L. essential oil against Candida strains, the leading cause of yeast infectious(2025) Kıran, Tugba Raıka; Unver, Tuba; Erenler, SebnemAquilaria malaccensis L., known as Agarwood, is widely found in India, Malaysia, Bhutan, and Indonesia. It is a pleasantly scented plant used in the production of resin. It is an interesting material in the field of health due to its resin and essential oil, which exhibit antimicrobial properties. This study aimed to evaluate the antifungal properties of A. malaccensis L. essential oil and determine its minimum inhibitory concentrations (MIC) against the Candida species tested. The inhibitory effect of A. malaccensis L. essential oil was tested on five Candida species. The broth microdilution method was used to determine the MIC values against the tested microorganisms, and the viability of microorganisms exposed to the plant essential oil was assessed using resazurin sodium salt. According to the results, the MIC of the plant essential oil against Candida tropicalis, Candida krusei and Candida albicans is 62.50 µL/mL. While the MIC against Candida glabrata is 31.25 µL/mL, the MIC against Candida parapsilosis is 7.81 µL/mL. These results show the potential of A. malaccensis L. as an anti-candidal agent. The continuation of this study revealed the need for optimizing and implementing more comprehensive antimicrobial tests.Öğe Assessment of the Antifungal Effect of Biotechnological Product-A New Vegan Agent Microbial Chondroitin Sulfate Against Predominant Candida Strains(Jihad Daneshgahi, 2024) Erenler, Ayse Sebnem; Unver, Tuba; Melekoglu, RaufMicrobial Chondroitin Sulfate (CS), possesses biocompatible, antiallergic, and non-toxic properties due to its polyanionic structure hold potential as an antifungal agent. This study investigated the effectiveness of microbial CS generated from recombinant Escherichia coli C2987 by biotechnological techniques as an antifungal product for treating Candida infections. Chondroitin biosynthesis was conducted utilizing a recombinant non-pathogenic E. coli, generated through the transformation of plasmid pETM6-PACF-vgb, which carries genes (kfoA, kfoC, and kfoF) responsible for chondroitin synthesis, along with the Vitreoscilla hemoglobin gene (vgb). The broth microdilution and agar dilution assays were employed to assess the antifungal activity of microbial CS and commercial CS against predominant Candida strains comparatively. The inhibitory effect of microbial CS against Candida albicans, Candida tropicalis, Candida parapsilosis, , and Candida krusei was greater than that of commercial CS. This study demonstrates the antifungal activity of microbial CS, a pharmacological agent produced from a recombinant source (vegan-halal). Microbial CS can be a potential supportive treatment not only for vaginal candidiasis but also for other Candida infections that may cause skin and mucosal infections, with its supportive effect on connective tissues and its therapeutic-preventive effect on possible Candida infections.Öğe BIOCHEMICAL EFFECT EVALUATION OF MICROBIAL CHONDROITIN SULPHATE IN EXPERIMENTAL KNEE OSTEOARTHRITIS MODEL(Parlar Scientific Publications (P S P), 2022) Erenler, Ayse Sebnem; Karabulut, Aysun Bay; Sevimli, Resit; Geckil, Hikmet; Akpolat, Nusret; Unver, Tuba; Otlu, OnderOsteoarthritis (OA) is the most common chronic joint disease, primarily due to aging. Chondroitin sulfate (CS) is a glycosaminoglycan (GAG) commonly used to treat osteoarthritis. CS can delay the progression of pathology or reverse morphological changes in joint structure. Traditionally CS is produced from animal sources. However, due to different reasons such as contamination, ecological risk, and the possibility of infectious diseases, the trend towards microbial sources has increased because of its advantages such as purer, more antiallergic, and lower Molecular Weight (MW) than animal sources. Biochemical analysis of Microbial CS (MCS), which is a new and significant alternative as a source of CS in the OA healing process, has not been evaluated in the literature yet. This study was designed to analyze the biochemical effects of MCS produced by our team from a microbial source, with an MW value of 269 Daltons, on the osteoarthritis healing process compared to the commercial foiut. We aim to reach data that MCS has a higher antioxidant effect than animal -sourced CS, and in this way, it is a more suitable production for the treatment of osteoarthritis. In this study, knee osteoarthritis was surgically induced in experimental rabbits; and TGF113, CAT, MPO, TOS, and OSI parameters measured in blood samples before the operation and after the healing period were analyzed comparatively. After the surgical application, the rabbits were randomly divided into three groups: control, animal -sourced CS, and E. cull sourced. MCS. The standard rabbit diet was administered daily to 10 rabbits in Group 1 (control), and. CS and MCS were applied daily to the other groups as 17 mg/kg for 12 weeks. Blood samples were taken from rabbits at the 12th week after surgery, and TGF-113, CAT, MPO, TOS, and OSI parameters were biochemically evaluated. This study has confirmed that the antioxidant properties of MCS and data on its effectiveness in controlling oxidative stress compared to animal -sourced CS. Based on these results, it can be concluded that MCS has a significant potency of nutraceutical and therapeutic agents for OA treatment.Öğe Chemical composition and antimicrobial activity of an apolar extract from Lactuca serriola L. leaves(Pergamon-Elsevier Science Ltd, 2024) Unver, Tuba; Gurhan, IsmetLactuca serriola L. is an annual herbaceous plant species belonging to the Asteraceae family, called Prickly lettuce, Wild lettuce, and Jagged lettuce. L. serriola grows on grassy and rocky slopes in many regions in Europe, Asia, Australia, Africa, and North, Central and South America. The plant is used as a natural pharmaceutical agent in primary health care due to its analgesic, anti-inflammatory, antibacterial, and antioxidant properties, which are attributed to the compounds it contains. However, this is the first study demonstrating the antimicrobial activity of L. serriola essential oil. In this study, L. serriola essential oil was obtained by hydrodistillation of plant leaves and analyzed by Gas Chromatography -Mass Spectrometry (GS -MS); subsequently, antimicrobial properties of the essential oil were evaluated using agar dilution and broth microdilution methods. As a result of the GS -MS analysis, hexadecanoic acid, oleic acid, myristic acid, hexahydrofarnesyl acetone, beta-ionone, and n-tetradecyl butanoate were found as dominant components in the plant essential oil with the rate of 6.61%, 4.84%, 2.05, 1.55%, 1.3%, and 1.09% (v/v), respectively. The MIC value of L. serriola essential oil against Enterobacter aerogenes, Staphylococcus aureus , Pseudomonas aeruginosa , Candida albicans , and C andida tropicalis was found to be 0.94 mu LmL -1 , and MIC values were determined as 1.87 mu LmL -1 and 0.47 mu LmL -1 against Klebsiella pneumonia and Candida parapsilosis , respectively. These results have opened a new horizon regarding the usability of L. serriola essential oil as a pharmacological therapeutic antibacterial and antifungal agent.Öğe Comparative Analysis of Antioxidant, Anticholinesterase, and Antibacterial Activity of Microbial Chondroitin Sulfate and Commercial Chondroitin Sulfate(Wiley-V C H Verlag Gmbh, 2023) Unver, Tuba; Erenler, Ayse Sebnem; Bingul, Murat; Boga, MehmetChondroitin synthesis was performed using the recombinant Escherichia coli(C2987) strain created by transforming the plasmid pETM6-PACF-vgb, which carries the genes responsible for chondroitin synthesis, kfoA, kfoC, kfoF, and the Vitreoscilla hemoglobin gene (vgb). Then, Microbial chondroitin sulfate (MCS)'s antioxidant, anticholinesterase, and antibacterial activity were compared with commercial chondroitin sulfate (CCS). The antioxidant studies revealed that the MCS and CCS samples could be potential targets for scavenging radicals and cupric ion reduction. MCS demonstrated better antioxidant properties in the ABTS assay with the IC50 value of 0.66 mg than CCS. MCS showed 2.5-fold for DPPH and almost 5-fold for ABTS *+ (with a value of 3.85 mg/mL) better activity than the CCS. However, the compounds were not active for cholinesterase enzyme inhibitions. In the antibacterial assay, the Minimum inhibitory concentration (MIC) values of MCS against S. aureus, E. aerogenes, E. coli, P. aeruginosa, and K. pneumoniae (0.12, 0.18, 0.12, 0.18, and 0.18 g/mL, respectively) were found to be greater than that of CCS (0.42, 0.48, 0.36, 0.36, and 0.36 g/mL, respectively). This study demonstrates that MCS is a potent pharmacological agent due to its physicochemical properties, and its usability as a therapeutic-preventive agent will shed light on future studies.Öğe Comparative evaluation of cytotoxic and anti-metastatic function of microbial chondroitin sulfate and animal-originated commercial chondroitin sulfate in cancer cells(C M B Assoc, 2023) Unver, Tuba; Celik-Uzuner, Selcen; Erenler, Ayse SebnemCancer has the second-highest mortality rate worldwide after cardiovascular disease. In addition, cervical and breast cancer are two of the leading causes of cancer-related deaths among women. The tumor microenvironment, which consists of cells that form blood vessels, proteins, fibroblasts, and immune cells, is a therapeutic target for cancer therapy. As part of the extracellular matrix (ECM), glycosaminoglycan Chondroitin Sulfate (CS) is related to diverse aspects of tumor growth and metastasis depending on the CS sulfate pattern. This study analyzed the roles of Microbial CS and Commercial CS in tumor growth and metastasis using HeLa cervical cancer cells, MDA-MB-231 metastatic breast cancer cells, and normal fibroblasts. In addition, the role of CS types in wound healing was also assessed comparatively. Microbial CS was more cytotoxic in MDA-MB-231 cells than HeLa compared to Commercial CS. Although both CS reduced cell viability in normal cells, the selective index of Microbial CS in MDA-MB-213 cells was higher than its commercial counterpart. In addition, the role of CS types in wound healing was also assessed comparatively. Both types of CS decreased the cell migration in MDA-MB-231 breast cancer cells, but HeLa cells were more sensitive to Microbial CS than Commercial CS to heal the wound. The wound healing of NIH3T3 cells after Microbial CS was similarly high to the healing after Commercial CS. This preliminary study shows that microbial CS produced by biotechnological methods from a recombinant source created by our team can be an effective therapeutic agent in various types of cancer.Öğe Development of microbial chondroitin sulfate-based proton exchange membranes for microbial fuel cells(Elsevier Sci Ltd, 2024) Erenler, Sebnem A.; Unver, Tuba; Ozaslan, Bahar F.; Koytepe, Suleyman; Sezer, SeldaTechnological developments have led to a significant increase in energy demand, and thus the interest in alternative energy has increased in the same direction. For this reason, fossil fuel reserves and climate-based renewable energy sources were used as alternatives in energy production, but the desired success was not fully achieved due to the decrease in fossil fuel and climate changes, and a new alternative energy source was sought. This situation has made Microbial Fuel Cells (MFC), which can directly convert chemical energy, an important alternative to renewable energy, from organic waste into electrical energy with the help of microorganisms. Therefore, in this study, microbially obtainable chondroitin, which is a non-toxic, biocompatible organic molecule that will not disrupt the ecological balance, sulfate-based proton exchange membrane was prepared for the microbial fuel cell. For this, Chondroitin was synthesized by the microbial method, chondroitin sulfate was obtained by sulfation, and chondroitin sulfate membranes were prepared by cross-linking with sulfosuccinic acid at varying molar concentrations (0.2, 0.4, 0.6, and 0.8). Firstly, the structural characterization, thermal properties, and morphological features of the prepared 20 mm thickness membranes were investigated, and then the effects of parameters such as pH change, voltage, quaternization, internal resistance, and coulomb efficiency on microbial fuel cell performance were studied. The best result was found to be that of chondroitin sulfate cross-linked with 0.8 M sulfosuccinic acid, which had an internal resistance of 0.310 omega, a power density of 30 mW/m2, and a coulomb efficiency of 70 %. Additionally, proton conductivity was measured to be 0.9919 mS/ cm, and thanks to the proton conduction efficiency of the designed Microbial chondroitin sulfate membranes, it has been determined that it has an effective proton exchange membrane potential. These developments show that microbial chondroitin sulfate-based membranes may be an alternative candidate for microbial fuel cells.Öğe Effect of vgb gene on microbial chondroitin sulfate production in recombinant Escherichia coli pETM6-PACF-vgb and physicochemical characterization of produced chondroitin sulfate(Cellular and Molecular Biology Association, 2025) Erenler, Ayse Sebnem; Unver, Tuba; Ceylan, Ahmet Faruk; Ozcan, Imren; Geckil, HikmetChondroitin Sulfate (CS) is an essential component of the extracellular matrix and is a sulfated glycosaminoglycan structurally composed of a polysaccharide chain consisting of N-acetyl galactosamine and glucuronic acid. The use of CS of animal origin is common in pharmacological research. The disadvantages of traditional sources and methods used in the production of CS, which is used in various applications in the medicine, veterinary, pharmacy, and cosmetic sectors, have made microbial production a vital alternative. In this study, recombinant Escherichia coli (pETM6-PACF-vgb) strain, in which kfoA, kfoC, kfoF and vgb gene regions are co-expressed, and E. coli pETM6-PACF strain, which does not contain the vgb gene, were used in the microbial production of CS. The vgb gene is the region responsible for expressing the bacterial protein Vitreoscilla hemoglobin (VtHb). This study investigated the effect of the expression of VtHb in E. coli on increasing bacterial cell respiration and, therefore, how ATP production would affect cell growth and the acquisition of chondroitin and microbial chondroitin sulfate (MCS) from biomass. The analysis results determined a 23.07% increase in the amount of MCS produced from the vgb+ strain. The presence of vgb had positively affected culture age and reproductive kinetics. Spectrophotometric measurements, NMR, HPLC, FT-IR, TGA, DTA, and DSC analyses for the reproductive values and physicochemical characterization of the obtained MCS were applied to discuss this production process. For more detailed results on this subject, future research focused on optimization is needed. © 2025 Cellular and Molecular Biology Association. All rights reserved.Öğe Elucidating the antimicrobial and anticarcinogenic potential of methanolic and water extracts of edible Tragopogon coelesyriacus Boiss.(Wiley, 2024) Unver, Tuba; Uzuner, Ugur; Celik-Uzuner, Selcen; Gurhan, Ismet; Sivri, Nur Sena; Ozdemir, ZeynepTragopogon coelesyriacus is a pharmacotherapeutic herbaceous plant belonging to the Asteraceae family and consumed as a vegetable. Here, the methanolic and water extracts of T. coelesyriacus were obtained from its aboveground parts (stem, leaves, and flowers), and the phytochemical potentials were investigated by LC-HRMS (liquid chromatography-high resolution mass spectrometry) analysis for the first time. The antibacterial, antifungal, and anticarcinogenic activities of T. coelesyriacus extracts were investigated using experimental and in silico methods. T. coelesyriacus methanol extract revealed remarkable inhibitory activity against Staphylococcus aureus, Pseudomonas aeruginosa, and Klebsiella pneumonia (MICs = 0.83, 1.67, and 1.67 mg/mL, respectively) compared to Escherichia coli and Enterobacter aerogenes (MIC = 53.3 mg/mL). Inhibitory effects of T. coelesyriacus methanolic extracts were also observed in all Candida species tested, with the highest inhibition on Candida krusei (MIC = 0.83 mg/mL), whereas no inhibitory effect was identified from the water extract. Additionally, both T. coelesyriacus methanolic (IC50 = 86 mu g/mL) and water (IC50 = 92 mu g/mL) extracts revealed significant selective anticarcinogenic effects on AR42J pancreatic cancer cells. HeLa and MDA-MB-231 cells were, however, more resilient to methanol and water extract, respectively. In silico analyses further elucidated the noteworthy antibacterial potential of keracyanin chloride on S. aureus MurB enzyme and the remarkable inhibitory potential of naringin on FYN kinase specific for pancreatic cancer (AR42J) development. In conclusion, T. coelesyriacus phytochemicals with antibacterial, antifungal, and anticancer properties were revealed for the first time, and molecular docking studies on potential targets confirmed good agreement with experimental findings. Therefore, the current studies on T. coelesyriacus provide the basis for investigating new pharmaceutical potentials of other Tragopogon members.Öğe Examination of the anti-candida activity of vitexin against candida species ınducing fungal ınfection(2025) Unver, Tuba; Dimdik, Merve; Yılmaz, RızgarInfections caused by Candida species have become a serious problem threatening global health systems today. This situation reveals the need to investigate new antifungal agents that can be alternatives to current treatment approaches, which are safer, more accessible and more effective. In this context, the potential anti-Candida effect of vitexin, a natural compound belonging to the flavonoid family, on different Candida species under in vitro conditions, and experimental methods, reveals the levels of its impact against different Candida species. In this study, vitexin's minimum inhibitory concentration (MIC) values against Candida species were determined using dilution methods. The activity of vitexin against Candida glabrata (ATCC 90030), Candida parapsilosis (ATCC 22019), Candida tropicalis (ATCC 13803), Candida krusei (ATCC 14243), and Candida albicans (ATCC 14053) taken from the American Type Culture Collection (ATCC) was measured. According to broth microdilution results, the MIC value of vitexin was determined as 12 mg/mL against C. glabrata, C. tropicalis, and C. albicans, and 24 mg/mL against C. krusei and C. parapsilosis. According to the results of the agar dilution method, the MIC value was found to be 24 mg/mL for all Candida species. When the results of agar dilution and broth microdilution methods were compared, slight differences were observed in the MIC values of vitexin against Candida species. The data obtained from the study indicate that vitexin may be evaluated as a potential agent for treating various Candida infections. Thus, it is thought that the anti-Candida effect of vitexin can form a scientific basis for more comprehensive preclinical and clinical studies to be conducted in the future.Öğe Isorhamnetin as a promising natural bioactive flavonoid: in vitro assessment of its antifungal property(2024) Unver, TubaIsorhamnetin (3’-methylquercetin) is an important flavonoid produced as a secondary metabolite from medicinal and aromatic plants due to its pharmacological and therapeutic properties. Thus far, the anticancer, antiallergic, antiinflammatory, antioxidant, antiviral, and antimicrobial properties of isorhamnetin have been evaluated in indirect studies conducted with isorhamnetin found in plant extracts or essential oils or direct studies performed with pure isorhamnetin. However, this is the first study in the literature on the antifungal activity of 97% pure isorhamnetin against C. tropicalis, C. albicans, C. krusei, and C. parapsilosis using two assays including agar dilution and broth microdilution methods. This study showed that isorhamnetin has a significant inhibitory effect against all Candida species used. The minimum inhibitory concentration (MIC) value of isorhamnetin against C. tropicalis, C. albicans, C. krusei, and C. parapsilosis was 1.875 mg/mL, the same for all yeast strains. These results have opened a new horizon regarding the usability of isorhamnetin as a pharmacological therapeutic antifungal agent.Öğe Multidirectional in silico and in vitro Research for the Pharmaceutical Potential of Fibigia Clypeata (L.) Medik: Phytochemical, Antimicrobial, and Antimyeloma Properties(Wiley-V C H Verlag Gmbh, 2025) Unver, Tuba; Uzuner, Ugur; Akcora-Yildiz, Dilara; Gurhan, Ismet; Arkan, Caglar; Ozdemir, ZeynepFibigia clypeata (L.) Medik, a member of the Brassicaceae, has been the subject of limited research on its pharmaceutical and medicinal properties. This study aims to evaluate the phytochemical, antimicrobial, and antimyeloma properties of F. clypeata extracts and detail these results in silico analyses. The minimum inhibitory concentration (MIC) of F. clypeata extracts was determined using dilution methods, and antimyeloma activity was determined using an MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide) assay. The findings were evaluated by in silico analyses and correlated with the results of liquid chromatography-high-resolution mass spectrometry. The inhibitory effect of the water extract (MIC is 15 mg mL-1 against bacterial strains; MICs are between 7.5 and 3.75 mg mL-1 against Candida strains) was determined to be more potent than methanol extract (MIC is 60 mg mL-1 against bacterial strains; MICs are between 30 mg/mL and 7.50 mg mL-1 against Candida strains). Molecular docking findings revealed that cyanidin 3-rutinoside chloride showed the highest binding affinity to Staphylococcus aureus MurB, Candida parapsilosis, and Candida albicans dihydrofolate reductases and the antitumor target human epidermal growth factor receptor protein. Based on MTT results, F. clypeata extracts significantly decreased cell viability dose-dependently in three human MM and noncancerous MCF10A cell lines. F. clypeata harbor valuable antimicrobial and moderately anticancerogenic compounds.Öğe Screening of phenolic components and antimicrobial properties of Iris persica L. subsp. persica extracts by in vitro and in silico methods(Wiley, 2024) Unver, Tuba; Uslu, Harun; Gurhan, Ismet; Goktas, BunyaminThe tendency toward natural herbal products has increased due to the antibiotic resistance developed by microorganisms and the severe side effects of antibiotics commonly used in infectious diseases worldwide. Although antimicrobial studies have been conducted with several species of the Iris genus, this study is the first in the literature to be performed with Iris persica L. subsp. persica aqueous and methanol extracts. In this study, the phenolic content of I. persica was determined by LC-MS/MS analysis, the in vitro antimicrobial activity of I. persica aqueous and methanol extracts was examined, and this study was supported by in silico analysis. Consequently, methanol and aqueous extracts were observed to have inhibitory effects against all tested microorganisms except Candida krusei. Although the MIC values of aqueous extract and methanol extract against Staphylococcus aureus and Klebsiella pneumoniae are the same (22.5 and 11.25 mg/mL, respectively), the inhibitory effect of aqueous extract is generally more potent (MIC value is 11.25 mg/mL for Candida parapsilosis and other bacterial species, and 90 mg/mL for Candida albicans and Candida tropicalis) than that of methanol extract. In silico results showed that hydroxybenzaldeyde, vanillin, resveratrol, isoquercitrin, kaempferol-3-glucoside, fisetin, and luteolin were more prone to antifungal activity. Hence, shikimic, gallic, protocatechuic, vanillic, caffeic, o-coumaric, trans-ferulic, sinapic acids, and hesperidin were more prone to antibacterial activity. In vitro and in silico results show that the antibacterial activity of our extracts may be higher than the antifungal activity. This preliminary study indicates the anti-infective potential of I. persica extracts and their usability in medicine and pharmacology.Öğe Shedding Light on the Phytochemical and Biological Fingerprints of Fibigia clypeata (L.) Medik Essential Oil as a Pharmacotherapeutic Agent(Wiley, 2025) Unver, Tuba; Bingul, Murat; Uslu, Harun; Gurhan, Ismet; Goktas, Bunyamin; Sahin, Hasan; Boga, MehmetSince plant essential oil contains medicinally valuable compounds, its usability as a pharmacotherapeutic agent has been the focus of attention within the century's needs. The lack of sufficient studies on the medical and pharmacological evaluation of Fibigia clypeata (L.) Medik has made this plant the target of our study. This study analyzes the phytochemical composition and biological activity of F. clypeata essential oil. As a result, dimethyl disulfide and dimethyl trisulfide were found to be the main compounds of the plant essential oil, with rates of 73.13% and 19.87%, respectively. The antifungal property of plant essential oil is more effective than its antibacterial property, with MIC values ranging between 0.039 and 0.312 mu L/mL for fungal species and up to 3.750 mu L/mL for bacterial species. The enzyme inhibition profiles were investigated towards two enzymes, namely, anticholinesterase and alpha-glucosidase, targeted for anti-diabetic studies. Anticholinesterase activity was proved with the IC50 values of 17.31 and 4.78 mu g/mL for Acetylcholinesterase (AChE) and Butyrylcholinesterase (BChE) enzymes, respectively. DPPH and CUPRAC activities were the most promising antioxidant studies, with values of 1.54 and 3.72 mu g/mL. It was observed that alpha-Terpineol made a hydrogen bond with ASN80, and 1-(2,6,6-Trimethyl-1,3-cyclohexadien-1-yl)ethanol made a hydrogen bond with SER82. Although molecular dock scores were better for antifungal activity, it was determined that no interactions, such as hydrogen bonding or pi interaction, were observed. This preliminary study showed that F. clypeata essential oil is a natural source with promising in vitro antimicrobial, antioxidant, and anticholinesterase activities that warrants further investigation, including safety assessments, due to the high concentration of sulfur-containing compounds. Molecular docking and ADME prediction results showed that alpha-Terpineol and 1-(2,6,6-Trimethyl-1,3-cyclohexadien-1-yl)ethanol were more prone to antimicrobial activity.Öğe Shikimic acid, cyclohexene as a hydroaromatic intermediate, harbors potent in vitro antimicrobial activity(2024) Unver, TubaAim: Shikimic acid is a hydroaromatic intermediate in the amino acid biosynthesis pathway in bacteria, fungi, and plants. Shikimic acid is an essential agent in applied sciences, especially in pharmacy and medicine. It can be used as a reactant in organic synthesis to obtain various medicinal drugs. This study aims to evaluate the antibacterial and antifungal properties of shikimic acid comparatively and to determine the minimum inhibitory concentrations (MIC) of shikimic acid against the tested Candida and bacterial species. Materials and Methods: The inhibitory effect of pure (98.85%) shikimic acid was tested on five bacteria (two Gram-positive and three Gram-negative) and five Candida species. The broth two-fold microdilution method was used to determine the MIC values against the tested microorganisms, and the viability of microorganisms treated with shikimic acid was determined using resazurin sodium salt. Results: The MIC values of shikimic acid against Candida glabrata, Candida albicans, Candida krusei, Candida tropicalis and Candida parapsilosis were determined to be between 250 and 31.25 mg/mL. However, the MIC values against bacterial species, including Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae, Staphylococcus aureus and Enterobacter aerogenes, ranged between 15.625 and 3.906 mg/mL. Therefore, the antibacterial effect of shikimic acid is almost twenty times stronger than its antifungal effect. Conclusion: This preliminary study shows that shikimic acid is also usable as an antibacterial and antifungal as a potential therapeutic agent in addition to its pÖğe Unveiling the Chemical Constituents and Inhibitory Roles of Extracts from Pinus Pinea L. Nut and Nutshell: A Novel Source for Pharmaceutical Antimicrobials(Wiley-V C H Verlag Gmbh, 2024) Unver, Tuba; Gurhan, IsmetAntibiotic resistance in infectious diseases has been a serious problem for the last century, and scientists have focused on discovering new natural antimicrobial agents. Pinus pinea has been used as a natural pharmacotherapeutic agent with antimutagenic, anticarcinogenic, and high antioxidant properties. In this study, GC-MS and LC-HR/MS were employed to analyze Pinus pinea L. nut and nutshell extracts. DPPH radical scavenging assay was performed to analyze the antioxidant properties of the extracts, but no activity was determined. GC-MS analysis showed that linoleic, oleic, and palmitic acids were the three most dominant fatty acids in nut and nutshell extracts, with ratios between 6.75 % and 47.06 % (v/v). LC-HR/MS revealed that the nutshell methanol extract had a higher phenolic content than other extracts, with vanillic acid (1.4071 mg/g). Antimicrobial activity assays showed that the minimum inhibitory concentrations (MIC) of the extracts varied between 5.94 and 190 mg/mL, and the most significant inhibition was seen in the nutshell methanol extract (MICs: between 5.94 and 47.5 mg/mL). Consequently, the antimicrobial activity of the extracts can be attributed to the dense fatty acids they contain, and the nutshell methanol extract showed the most potent inhibition related to the abundance of phenolic compounds in the extract.
