Yazar "Ozturk, Mehmet" seçeneğine göre listele

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    Electrospun lavender essential oil-loaded polylactic acid nanofibrous mats for antioxidant applications
    (Springer, 2024) Ismaili, Dea; Parin, Fatma Nur; Sicak, Yusuf; Ozturk, Mehmet; Terzioglu, Pinar
    In this study, the lavender essential oil-incorporated polylactic acid (PLA) nanofibers were fabricated by the electrospinning technique with the presence of kolliphor as a nonionic surfactant. The FTIR spectra supported the chemical composition of the fibers. The FTIR spectra demonstrated that there is no chemical reaction present between PLA and lavender essential oil. The SEM images of all nanofibers showed bead-free morphology. ImageJ results showed that the average diameter of lavender oil-loaded fibers ranged between 121.6 +/- 32 and 228.2 +/- 53 nm. All lavender essential oil-incorporated nanofibers were hydrophobic with satisfactory thermal properties. Furthermore, the lavender essential oil-incorporated PLA nanofibrous mats exhibited good antioxidant activity. The results showed that as the concentration of the essential oil in resulting nanofibers increased, the antioxidant activity also increased. According to the results of this study, lavender essential oil-loaded PLA fibers can be considered for a wide range of potential applications such as active packaging, food coating, facial masks, and wound dressing.
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    Pine honey-loaded electrospun poly (vinyl alcohol)/gelatin nanofibers with antioxidant properties
    (Taylor & Francis Ltd, 2021) Parın, Fatma Nur; Terzioğlu, Pınar; Sicak, Yusuf; Yıldırım, Kenan; Ozturk, Mehmet
    In this study, bioactive fibers were produced using polyvinyl alcohol (PVA), gelatin and pine honey by using electrospinning method. The influence of honey content (0-15 wt%) on the infrared spectrum, morphology, average diameter, surface wettability and antioxidant activity of the electrospun fibers was evaluated. The Fourier Transform Infrared spectrum showed the successful incorporation of honey to the fibers. Electrospun PVA/gelatin/honey nanofibers were successfully obtained with average diameters ranging from 299 +/- 105 nm to 494 +/- 192 nm. Increasing the honey content caused an increase in the fiber diameter. The values of the water contact angles of the fibers were increased upon the addition of pine honey. Among the fibers, the 10 wt% honey-loaded fiber exhibited a high antioxidant capacity, which was monitored using DPPH radical scavenging, beta-carotene-linoleic acid and cupric reducing antioxidant capacity assays. In view of these results, the PVA/gelatin/honey fibers can be potential candidates for biomedical and active food packaging applications.
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    The Addition of Opuntia ficus-indica Ethanolic Extract to a Skimmed Milk-Based Extender Impacts Ram Sperm Quality
    (Wiley, 2023) Allai, Larbi; Druart, Xavier; Terzioglu, Pinar; Louanjli, Noureddine; Nasser, Boubker; Ozturk, Mehmet; El Amiri, Bouchra
    Recently, researchers have focused on the use of natural antioxidants to improve semen quality as a key element for successful artificial insemination. In this context, the first aim of this study was to determine the antioxidant activity and composition (minerals, vitamins, and sugars) of Opuntia fcus-indica cladode ethanolic extract (ETHEX). A further purpose of the study was to investigate the effect of ETHEX supplementation on the quality of liquid ram semen extended with skim milk (SM) at 5 degrees C. The antioxidant activity of ETHEX was studied using free radical 1, 1-diphenyl-2-picrylhydrazyl (DPPH center dot) assay. The mineral composition and the sugar and vitamin contents of ETHEX were determined using an inductively coupled plasma optical emission spectrometry (ICP-OES) and HPLC-DAD-RID analytical instruments. As a second part, semen was collected from five Boujaad rams with an artificial vagina. The ejaculates with more than 70% motility were pooled, extended with skim milk (SM) extender without (control) or supplemented with 1-8% of ETHEX (37 degrees C; 0.8 x 109 sperm/mL). Sperm quality parameters were assessed at 8, 24, 48, and 72 h. The results showed that ETHEX had a higher antioxidant activity compared to those of ascorbic acid and butylated hydroxytoluene (BHT). Furthermore, ETHEX contains a considerable amount of minerals, vitamins, and sugars. The inclusion of 1 or 2% ETHEX in SM increased the sperm motility, viability, and membrane integrity and decreased the abnormality of spontaneous and catalyzed lipids peroxidation (p < 0.05) up to 72 h. In addition, semen diluted with 1 and 2% ETHEX decreased the level of DNA fragmentation compared to the control group (p < 0.05). In conclusion, the ETHEX could be recommended to improve the quality of liquid ram spermatozoa. However, its effects on artificial insemination should be further studied.