Browsing by Author "Gonca, Serpil"

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Antioxidant, Antimicrobial, Dna Cleavage, Fluorescence Properties and Synthesis of 4-(3,4,5 Phenoxy) Substituted Zinc Phthalocyanine
(Taylor & Francis Ltd, 2022) Agirtas, Mehmet Salih; Cabir, Beyza; Gonca, Serpil; Ozdemir, Sadin
The newly designed 4-(3,4,5-trimethoxybenzyloxy)phenoxy)phthalonitrile and zinc phthalocyanine compounds were synthesized. Fluorescence, degradation, aggregation, antioxidant, DNA cleavage, and antimicrobial properties of these compounds were investigated. Fluorescence, degradation, and aggregation properties were examined in different solvents. Suitable solvents were determined for the photophysical applications. Their dissolution in different solvents provides an advantage for applications. The ability to show emission spectra in different solvents provides the potential for use in applications. The antioxidant qualities of newly synthesized compounds were researched two methods by using free radical scavenging ability of DPPH and ferrous ion chelating ability. The maximum DPPH activity was observed by compound 5 causing 66.9% DPPH radical formation inhibition at 100 mg/L. Compound 4 showed strong ferrous ion chelating activity of 80.6% at concentration of 100 mg/L. All tested compounds showed good DNA cleavage activity at concentration of 150 mg/L. The compounds 4 and 5 showed good antimicrobial activity.
Characterization of Silver Nanoparticles Fabricated by Green Synthesis Using Urtica Dioica and Lavandula Angustifolia and Investigation of Antimicrobial and Antioxidant
(Taylor & Francis inc, 2024) Odemis, Omer; Ozdemir, Sadin; Gonca, Serpil; Agirtas, Mehmet Salih
Silver nanoparticles (AgNPs) was synthesized from Urtica dioica (UDANP) and Lavandula angustifolia (LAANP) plants. Silver nanoparticles obtained from green synthesis were characterized by UV-Vis, FTIR, SEM, TEM. The DPPH scavenging activities of UDANP were found as 73.58, 84.61, 100, 100, and 100% at 12.5, 25, 50, 100, and 200 mg/L, respectively. On the other hand, DPPH radical scavenging abilities of LAANP were determined as 62.56, 73.07, 78.71, 86.92, and 100% at 12.5, 25, 50, 100, and 200 mg/L, respectively. The ferrous chelating activities of LAANP were found as 7.96, 17.59, 29.45, 41.63, and 59.44% at 12.5, 25, 50, 100, and 200 mg/L, respectively. Besides UDANP was showed 73.58 and 84.61% metal chelating activity at 12.5 and 25 mg/L, respectively. The antimicrobial activity of UDANP and LAANP was performed using broth-dilution method. After the cell viability test of UDANP and LAANP, E. coli cell growth inhibited as 100%.
Green Synthesis of Palladium Nanoparticles: Preparation, Characterization, and Investigation of Antioxidant, Antimicrobial, Anticancer, and Dna Cleavage Activities
(Wiley, 2021) Gulbagca, Fulya; Aygun, Aysenur; Gulcan, Mehmet; Ozdemir, Sadin; Gonca, Serpil; Sen, Fatih
Green synthesis is considered to be one of the most suitable method because it enhances the therapeutic effects of palladium nanoparticles (Pd NPs). In this study, various biological activities such as antimicrobial, anticancer, antioxidant, and DNA cleavage activities of Urtica-mediated green synthesizing Pd NPs were investigated. The synthesized Pd NPs were characterized by using UV-vis, XPS, FT-IR, TEM, and XRD analyses. As a result of the TEM analysis of Pd NPs, the mean particle size was found to be 7.44 +/- 1.94 nm, and this result was supported by XRD analysis. The maximum DPPH scavenging activity was determined as 79.6% at 500 mg/L. The newly green synthesized Pd NPs exhibited high antimicrobial activity to gram-negative bacteria than gram-positive bacteria. Urtica-mediated green synthesized Pd NPs also showed double strain DNA cleavage activity. For the cytotoxic effects of Pd NPs, the MDA-MB-231 breast cancer cell line, HT-29 colon cancer cell line, Mia Paca-2 human pancreatic cancer cell line, and healthy cell line L929-Murine fibroblast cell line were used. IC50 values of Pd NPs against MDA-MB-231, HT-29, and MIA PaCa-2 cancer cell lines were calculated as 31.175, 20.383, and 29.335 mu g/ml, respectively. No significant cytotoxic effect was observed in the healthy lines L929.
One-Step Synthesized Biogenic Nanoparticles Using Linum Usitatissimum: Application of Sun-Light Photocatalytic, Biological Activity and Electrochemical H2o2 Sensor
(Academic Press inc Elsevier Science, 2023) Karimi, Fatemeh; Tiri, Rima Nour Elhouda; Aygun, Aysenur; Gulbagca, Fulya; Ozdemir, Sadin; Gonca, Serpil; Sen, Fatih
This study aimed to synthesize Ag NPs as a green catalyst for photocatalytic activity and to examine their bio-logical activities. It was determined that they have high activity in catalytic and biological activities. The green synthesis which is an environmentally friendly and inexpensive method was used to synthesize Ag-NPs using Linum usitatissimum as a reducing agent. Transmission electron microscopy (TEM), infrared to Fourier transform infrared (FTIR) spectroscopy, UV-Visible (UV-Vis) spectroscopy, and X-ray diffraction (XRD) were used to characterize the Ag NPs. In UV-Vis examination, Ag-NPs had intense peaks in the 435 nm region. The anti-bacterial activity of Ag NPs was investigated, and Ag NPs showed a high lethal effect against S. aureus, E. coli, B. subtilis, and MRSA. In addition, Ag NPs were tested for anticancer activity against the HT-29 colon cancer cell line, MDA-MB-231 breast cancer cell line, healthy cell line L929-Murine Fibroblast cell Lines, and MIA PaCa-2 human pancreatic cancer cell line at various concentrations (1-160 mu g/mL) and showed a high anti-cancerogenic properties against MDA-MB-231 cells. Ag NPs showed the ability of DNA cleavage activity. Also, the antioxidant activity of Ag NPs against DPPH was found to be 80% approximately. Furthermore, the pho-tocatalytic activity of Ag NPs against methylene blue (MB) was determined to be 67.13% at the 180th min. In addition, it was observed that biogenic Ag NPs have high electrocatalytic activity for hydrogen peroxide (H2O2) detection. In the sensor based on Ag NPs, linearity from 1 mu M to 5 mu M was observed with a detection limit (LOD) of 1.323 mu M for H2O2. According to these results, we conclude that the biogenic Ag NPs synthesized using Linum usitatissimum extract can be developed as an efficient biological agent as an antibacterial and anticancer also can be used as a photocatalyst for industrial wastewater treatment to prevent wastewater pollution.
The Study on Biological Activities of Silver Nanoparticles Produced Via Green Synthesis Method Using Salvia Officinalis and Thymus Vulgaris
(Tubitak Scientific & Technological Research Council Turkey, 2022) Odemis, Omer; Ozdemir, Sadin; Gonca, Serpil; Arslantas, Ali; Agirtas, Mehmet Salih
In the present study, Ag nanoparticles (AgNPs) were synthesized from Salvia officinalis and Thymus vulgaris, known as phytotherapy plants. The obtained silver nanoparticles were characterized using SEM, XRD, FTIR, and UV/Vis spectra. The antioxidant capacities of Salvia officinalis-mediated AgNP (SO-AgNP) and Thymus vulgaris-mediated AgNP (TV-AgNP) were analyzed in vitro using 1,1-diphenyl-2-picrylhydrazyl and iron chelating activity assays. DPPH activities were 83.74% and 57.17% for SO-AgNP and TV-AgNP at concentration 200 mg/L, respectively. Both green synthesized AgNPs exhibited good iron chelating activity. In addition, the DNA cleavage activities of SO-AgNPs and TV-AgNP were investigated with agarose gel electrophoresis technique. SO-AgNPs and TV-AgNP showed single-strand DNA cleavage activity. AgNPs showed that the SO-AgNP and TV-AgNp were effective against bacteria and fungi, and antimicrobic activities were assessed as minimal inhibition concentration (MIC). Remarkably, green synthesized AgNPs showed highly effective cell viability and biofilm inhibition effect. AgNPs also demonstrated slightly antimicrobial photodynamic activity after LED irradiation.
Synthesis, Antioxidant, Dna Cleavage and Antimicrobial Properties of Phthalocyanine Complexes Bearing the Poly-Hydroxyl Groups
(Springer int Publ Ag, 2021) Agirtas, Mehmet Salih; Cabir, Beyza; Yildiko, Umit; Ozdemir, Sadin; Gonca, Serpil
(4-((1-((2-(bis(2-hydroxypropyl) amino) ethyl) (2-hydroxypropyl) amino) propan-2-yl) oxy) phthalonitrile) (BHHP) was synthesized from reaction N, N, N ', N '- tetrakis (2-hydroxypropyl) ethylene diamine (SM) with 4-nitro phthalonitrile. Zinc, cobalt and copper phthalocyanine complexes were achieved from the reaction of BHHP compound with metal salts. Quantum chemical studies of these phthalocyanines have been computationally supported using density functional theory methods. The antioxidant properties of phthalocyanine compounds were determined with the help of l, l-diphenyl-2-picrilhydrazyl radical scavenging ability and chelating ability to iron ions. Compound 6 showed 72.8% inhibition of DPPH free radicals at 200 mg/L concentration and compound 4 showed 71.5% ferrous metal chelating activity at 200 mg/L concentration. The antimicrobial and DNA cleavage activities of compounds were also investigated. All tested phthalocyanine compounds showed excellent nuclease activity at all concentration. Antimicrobial activities of phthalocyanine compounds were detected using broth microdilution method and all test compounds demonstrated perfect antimicrobial activities. According to in vitro studies, copper phthalocyanine compound 6 has the best activity against the P. aeruginosa with 8 mu g/mL of MIC value.