Person: RAYAMAN, ERKAN
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RAYAMAN
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ERKAN
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Publication Open Access Effect of antibiotics on polymorphonuclear leukocyte functions and myeloperoxidase activity, glutathione and malondialdehyde levels in allergic asthma(2015-03-31) RAYAMAN, ERKAN; Rayaman, Pervi̇N; Rayaman, Erkan; Çevi̇Kbaş, Adi̇Le; Demi̇Rtunç, Refi̇K; Özer Şehi̇Rli̇, Ahmet; Alagöz, Şeyda Gül; Gürer, Ümran SoyoğulWe investigated the effect of ciprofloxacin, rifampicine and doxycycline on myeloperoxidase (MPO) activity, glutathione (GSH) and malondialdehyde (MDA) levels in allergic asthma patients and healthy volunteers. Polymorphonuclear leukocytes (PMNs) were isolated with ficoll-hypaque gradient centrifugation method. MPO activity was assayed with modified o-dianisidine, GSH by Ellman's and MDA levels by Beuge's method. PMN functions and MDA levels of patients significantly decreased when compared with healthy volunteers. Ciprofloxacin significantly increased PMN functions, MPO activity and MDA levels of both groups. We have demonstrated that ciprofloxacin has beneficial effects on MPO activity and PMN functions in allergic asthma patients and healthy volunteers.Publication Open Access Investigation on biological activities of Melissa officinalis subsp. altissima(2022-05-23) RAYAMAN, ERKAN; ŞENKARDEŞ, İSMAİL; TAŞKIN, TURGUT; Koç G., Rayaman E., Özdatlı Kurtuluş Ş., Ermanoğlu M., Yılmaz B. N. , Şenkardeş İ., Taşkın T.The genus Melissa is used as antibacterial, sedative, digestive aid, carminative, diaphoretic and bile secretion enhancer. It is included in the composition of the preparations used during nervous digestive system disorders, psychosomatic heart disorders and migraine. The flowering branches and leaves of Melissa officinalis L. subsp. altissima. are used as carminative, sedative and its antipyretic effects. It is also used in vascular occlusion, stomach aches, heart ailments, kidney inflammation, cholesterol, blood pressure, and diabetes. According to our knowledge there are not enough studies on these species grown in Turkey. The aim of this study is to examine the antioxidant, cytotoxic, anticholinesterase, anti-urease and antimicrobial activities of plant’ various extracts obtained by using the sequential maceration method. In the determination of antimicrobial activity well diffusion method on 6 gram negative, 4 gram positive and 3 yeast strains was used. DPPH, CUPRAC and FRAP techniques were used to examine the antioxidant properties of plant\" extracts. The extracts\" anticholinesterase, cytotoxic and anti-urease activity were determined using the Ellman, MTT and Indophenol techniques, respectively. In addition, the phenolic contents of the extracts were determined by FCR method. It was found that petroleum ether extract of the plant was effective against Enterecoccus faecalis and Staphylococcus aureus strains and ethyl acetate extract were effective against Staphylococcus aureus strains. The methanol extract of the plant exhibited the highest antioxidant activity when compared to other extracts. It was determined that the petroleum ether extract of Melissa officinalis L. subsp. altissima has stronger acetylcholinesterase and urease enzyme inhibition potential than its other extracts. Furthermore, in this study the ethyl acetate extract of the plant was found to have high cytotoxic activity.Publication Open Access Potential Adjuvant Effects of Nigella sativa Seeds to Improve Specific Immunotherapy in Allergic Rhinitis Patients(KARGER, 2010) GÜRBÜZ, BURÇAK; Isik, Huelya; Cevikbas, Adile; Gurer, Umran Soyogul; Kiran, Bayram; Uresin, Yagiz; Rayaman, Pervin; Rayaman, Erkan; Gurbuz, Burcak; Buyukozturk, SunaObjective: To investigate the effects of Nigella sativa seed supplementation on symptom levels, polymorphonuclear leukocyte (PMN) functions, lymphocyte subsets and hematological parameters of allergic rhinitis. Subjects and Methods: Twenty-four patients randomly selected from an experimental group of 31 (mean age 34 years) sensitive to house dust mites with allergic rhinitis and a control group of 8 healthy volunteers (mean age 23 years) were treated with allergen-specific immunotherapy in conventional doses for 30 days. After a month of immunotherapy, 12 of the 24 patients and the 8 healthy volunteers were given N. sativa seed supplementation (2 g/day orally) for 30 days. The remaining 12 patients continued only on immunotherapy during the same period. The other 7 patients were given 0.1 ml saline solution subcutaneously once a week as a placebo. The symptom scores, PMN functions, lymphocyte subsets and other hematological parameters were evaluated before and after all treatment periods. Results: There was a statistically significant increase in the phagocytic and intracellular killing tivities of PMNs of patients receiving specific immunotherapy, especially after the addition of N. sativa seed. The CD8 counts of patients receiving specific immunotherapy plus N. sativa seed supplementation significantly increased compared to patients receiving only specific immunotherapy. PMN functions of healthy volunteers significantly increased after N. sativa seed supplementation compared to baseline. Conclusion: N. sativa seed supplementation during specific immunotherapy of allergic rhinitis may be considered a potential adjuvant therapy. Copyright (C) 2010 S. Karger AG, BaselPublication Open Access Antimicrobial effect of probiotic microorganisms onclinical and standard Staphylococcus aureus isolates(2023-12-01) RAYAMAN, PERVİN; RAYAMAN, ERKAN; TETİK N., RAYAMAN P., RAYAMAN E., ADALETİ R.In this study we aimed to identify probiotic microorganisms in various pharmacy preparations, market and homemade probiotic products and investigate the antimicrobial effect of these microorganisms on clinical and standard Staphylococcus aureus isolates. The probiotic microorganisms were isolated from probiotic products mentioned above, then identified by Matrix Assisted Laser Ionization Mass Spectrophotometer (MALDI-TOF, Biomeriux) and also by conventional methods. The tolerance of these probiotic microorganisms to different salt, pH and temperature conditions was also detected. The antimicrobial activity of the specified probiotic microorganisms on S. aureus was designated by using spot on lawn and agar well diffusion methods. In our study among 16 probiotic products, 27 various probiotic microorganisms were specified by MALDI-TOF. Additionally, 15 of these probiotic microorganism species had an isolated reliability value above 90%. In our study 10 probiotic microorganism species, 7 of which were different from each other were found to maintain their viability in three various pH, salt and temperature conditions. These probiotic microorganisms were Lactobacillus rhamnosus (P.2 probiotic pharmaceutical product), Enterococcus gallinarum (homemade whey), Lactobacillus kefiri 1 (homemade kefir), Bacillus megaterium (homemade pickled juice), Lactobacillus kefiri 2 (homemade kefir), Lactobacillus rhamnosus (P.1 company preparation) Lactobacillus plantarum (P.3 company preparation), Bifidobacterium spp (M.4 company pure kefir), Enterococcus faecium (P.3 company preparation). We determined that Lactobacillus plantarum isolated from homemade whey had the highest antimicrobial activity on clinical MRSA 3 (Methicillin resistant Staphylococcus aureus) strain (inhibition zone =45.62 mm ± 0.84. Also, we have found that, probiotic microorganisms isolated from pharmacy preparations, market and homemade probiotic products showed antibacterial effect on clinical and standard Staphylococcus aureus by spot on lawn method. We designated that besides probiotic microorganisms isolated from various pharmacy preparations, probiotic microorganisms isolated from market and homemade products were efficient against clinical and standard S. aureus isolatesPublication Open Access The Biological Activities of Endemic Ballota pseudodictamnus subsp. lycia.(2022-05-23) RAYAMAN, ERKAN; TAŞKIN, TURGUT; Akduman B., Rayaman E., Yılmaz B., Ermanoğlu M., Gürdal B., Taşkın T.The genus Ballota L. (Lamiaceae) includes species known as boz ot, bal otu, nemnem otu and have medicinal uses among the people. Additionally, it known to be used by the public in the treatment of cough, asthma, headache, nausea, hemorrhoids, wounds and burns. Ballota taxa have various phytochemical classes such as essential oils, iridoids, saponins, terpenoids, flavonoids, phenolic acids, tannins, and organic acids. Ballota pseudodictamnus subsp. lycia is one of the endemic species growing in southwestern Turkey. As a result of our research on the literature a limited number of studies have been found on the biological activities of this species. The aim of this study is to examine the antioxidant, antimicrobial, anticholinesterase and anti-urease activities of different extracts (petroleum ether, chloroform and methanol) obtained from the aerial part of B. pseudodictamnus subsp. lycia. DPPH, CUPRAC, and FRAP techniques were used to examine the antioxidant properties of plant\" extracts. The extracts\" anti-urease, anticholinesterase and antimicrobial activity were determined using the Indophenol, Ellman and agar well diffusion method techniques, respectively. While the petroleum ether extract obtained from plant, was found to be effective against S. aureus, S.epidermidis and E. faecalis strains; its chloroform extract was effective against S.aureus and S.epidermidis strains and its methanol extract was found to be effective against Acinetobacter baumannii strains. It was found that the plant’ methanol extract showed the highest antioxidant activity when compared to the other extracts.Publication Open Access Chemical Composition and In Vitro Biological Activity of Two Thymus L. Varieties Growing in Turkey(2024-01-01) TAŞKIN, TURGUT; RAYAMAN, ERKAN; YILMAZ, BEYZA NUR; TAŞKIN T., Öksüz M., Bulkurcuoğlu B., Ercelen S., RAYAMAN E., Ermanoğlu M., YILMAZ B. N., Taşkın D., Şahin T., Kılıç Ö.Thymus kotschyanus var. kotschyanus (TKK) and T. kotschyanus var. glabrescens (TKG) varieties were used as both spice and medicine by the people in Turkey. It was determined that plants’ methanol extracts had the strongest antioxidant, anticholinesterase, antiurease activity and high total phenolic contents. The ethyl acetate and methanol extracts were found to have strong antimicrobial activity. Methanol extracts showed low hemolytic effect against human erythrocytes. It was determined that TKG extract showed higher anti-proliferative effect compared to TKK extract. Both plants extract significantly decreased reactive oxygen species (ROS) generation in cancer cells. It was determined that amounts of chlorogenic and rosmarinic acid compounds were similar in both plants, but apigenin 7-O-neohesperidoside compound was found in higher amounts in TKK. The findings obtained in this study suggest that methanol and ethyl acetate extracts obtained from these two species can be used as antioxidant, anticholinesterase, antimicrobial and antiurease agents. The findings support the traditional use of these species.