Browsing by Author "Ustaoglu B."

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Anticancer and biological properties of leaf and flower extracts of Echinacea purpurea (L.) Moench
(2021-06-01) Mohamed Sharif K.O.; Tufekci E.F.; Ustaoglu B.; Altunoglu Y.C.; Zengin G.; Llorent-Martínez E.J.; Guney K.; Baloglu M.C.
Echinacea purpurea (L.) Moench is an important medicinal herb; its roots, leaves and, flowers have been used by the food and pharmaceutical industries. In this study, DNA protection, antimicrobial, antioxidant-enzyme inhibition, and antiproliferative activities of water, methanol (MeOH), and ethyl acetate (EA) extracts of leaves and flowers of E. purpurea were evaluated. In addition, total phenolics and flavonoids, as well as individual compounds, were identified using colorimetric assays and HPLC-ion trap mass spectrometry, respectively. Chicoric acid and its isomer were the most abundant natural compounds, with concentrations similar to previous studies of E. purpurea. All extracts had antimicrobial activity against a broad range of bacteria, particularly Enterococcus faecalis. The antiproliferative activity of the extracts on the HeLa cells was shown. The lowest value of IC50 (73 μg/ml) came from the 24 h MeOH extract of flowers. The water extract of leaves showed strong antioxidant activity with the DPPH, ABTS, CUPRAC, and FRAP assays. EA and MeOH extracts of leaves showed a significant inhibition ability of cholinesterase and tyrosinase, respectively. The presented study suggested that E. purpurea extracts had promising therapeutic properties. Further investigation at the cellular level could be done to highlight the mechanism behind these biological activities.
Biogenic platinum nanoparticles using black cumin seed and their potential usage as antimicrobial and anticancer agent
(2020-02-05) Aygun A.; Gülbagca F.; Ozer L.Y.; Ustaoglu B.; Altunoglu Y.C.; Baloglu M.C.; Atalar M.N.; Alma M.H.; Sen F.
Herein, the biogenic platinum nanoparticles (Pt NPs) were synthesized by using black cumin seed (Nigella sativa L.) extract as a reducing agent. The biogenic platinum nanoparticles synthesized by black cumin seed extract was characterized in detail by Transmission Electron Microscopy (TEM), UV–vis spectrophotometer, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). According to TEM analysis, Pt nanoparticles have spherical shapes and sizes between 1–6 nm. Moreover, the biogenic Pt NPs was assessed for its cytotoxicity effect on MDA-MB-231 breast and HeLa cervical cancer lines and their antibacterial effect against selected strains of gram-positive and negative bacteria. The cytotoxicity and bacterial tests showed the effectiveness of biogenic Pt nanoparticles. Dose-dependent toxicity effects were shown in the MDA-MB-231 breast and HeLa cervical cancer lines (IC50: 36.86 μg/mL and 19.83 μg/mL, respectively). In addition, Pt NPs showed high zone diameters against gram-positive and gram-negative bacteria at concentrations of 100 and 500 μg/ml. These results contribute to the development of the pharmaceutical industry as a potential antibacterial and anticancer agent.
Biological synthesis of silver nanoparticles using Rheum ribes and evaluation of their anticarcinogenic and antimicrobial potential: A novel approach in phytonanotechnology
(2020-02-05) Aygün A.; Gülbağça F.; Nas M.S.; Alma M.H.; Çalımlı M.H.; Ustaoglu B.; Altunoglu Y.C.; Baloğlu M.C.; Cellat K.; Şen F.
This paper reports the anticarcinogenic and antimicrobial properties of silver nanoparticles (Ag NPs) obtained by green synthesis using the extract of Rheum ribes (R. ribes), a medicinal plant. For the synthesis of Ag NPs, the ethanolic extracts of R. ribes were used as a reducing as well as the stabilizing agent. For the characterization of Ag NPs, advanced analytical methods such as transmission electron microscopy (TEM), X-Ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and UV–vis spectrophotometry were performed. The synthesized Ag NPs obtained from R. ribes were evaluated as a cytotoxic agent against MDA-MB-231 breast carcinoma cell line. The IC50 values of the nanoparticles were ranged from 165 to 99 μg/mL against MDA-MB 231 cell line for 24 h and 48 h, respectively. The results show that the use of Ag NPs at low concentrations show the toxic effect in the cancer cells. In addition, the results of experiments on gram-positive (Staphylococcus aureus (S. aureus), Methicillin-resistant Staphylococcus aureus (MRSA) and Bacillus subtilis (B. subtilis)) and gram-negative (Escherichia coli (E. coli)) bacteria showed that the Ag NPs had high antimicrobial activity. The results suggest that Ag NPs can be developed as potential anticancer and antibacterial agents.
Multidirectional insights on Chrysophyllum perpulchrum leaves and stem bark extracts: HPLC-ESI-MS ⁿ profiles, antioxidant, enzyme inhibitory, antimicrobial and cytotoxic properties
(2019-08-01) Baloglu M.C.; Llorent-Martínez E.J.; Aumeeruddy M.Z.; Mahomoodally M.F.; Altunoglu Y.C.; Ustaoglu B.; Ocal M.; Gürel S.; Bene K.; Sinan K.I.; Zengin G.
Chrysophyllum perpulchrum Mildbr. ex Hutch. & Dalziel has been reported to possess several therapeutic properties in African traditional medicine. However, its pharmacological properties have not been fully studied. Herein, we focused on the evaluation of the antioxidant, enzyme inhibitory, antimicrobial and cytotoxic effects of three solvent extracts (ethyl acetate, methanol, and water) of the stem bark and leaves. Polyphenolic components of the extracts were also identified by high-performance liquid chromatography with electrospray ionization mass spectrometric detection (HPLC-ESI-MS n) . The methanolic stem bark extract possess the highest DPPH (2,2-diphenyl-1-picrylhydrazyl) scavenging, ferric and molybdenum (VI) reducing, and the highest inhibitory effect against acetylcholinesterase and butyrylcholinesterase. The aqueous stem bark extract displayed the highest ABTS (2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid)) scavenging and cupric reducing power. In contrast, the leaf ethyl acetate extract was the most effective metal chelator and α-amylase inhibitor while the leaf methanolic extract exhibited the highest tyrosinase and α-glucosidase inhibition. The highest total phenolic content (131.58 mg GAE/g extract) was recorded from the methanolic stem bark extract while the leaf methanolic extract was the richest in total flavonoid content (30.43 mg RE/g extract). Flavan-3-ols were main group in the methanol extracts. The minimum inhibitiory concentration values for the methanolic stem bark extract against Gram positive and negative bacteria strains ranged between 62.5–125 μg/ml. Bark extracts of C. perpulchrum were very effective against Salmonella kentucky, Proteus vulgaris and Staphylococcus aureus at 62.5 μg/ml. In addition, cytotoxic activity of stem bark samples was evident at lower concentration than those of leaf extracts. Stem bark extracts displayed the highest prevention against to HeLa cell line (IC 50= 264 μg/mL after 48 h). In light of the above, C. perpulchrum might provide health benefits against oxidative stress and the associated chronic diseases. Nonetheless, the detailed mechanism of action is yet to be further investigated.