Yazar "Sicak, Yusuf" seçeneğine göre listele

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    Betanin and Nano-Calcium Carbonate Incorporated Polyvinyl alcohol/Starch Films for Active and Intelligent Packaging Applications
    (Springer, 2023) Kavas, Eslem; Terzioglu, Pinar; Sicak, Yusuf
    Bio-based and biodegradable packaging are ideal for sustainable polymer packaging. In this study, cassava starch and polyvinyl alcohol (PVA) were used as the film-forming matrix, betanin (E-162) and nano-calcium carbonate (CaCO3) as the pH sensitive pigment and nanofiller, respectively. Solvent casting technique was used to develop ecofriendly composite films. For the first time, the color, mechanical, thermal, structural, ammonia sensitivity, and bioactivity properties of films containing different amounts of natural additives were compared. The changes determined in the Fourier transform infrared (FT-IR) spectrum were evidence of the interaction of additives with polymer matrix. The developed films showed similar thermal stability according to thermal degradation behaviors with three distinct weight losses. The temperatures of 10% residual weight were determined to be slightly higher (500.4-603.8 degrees C) in additive incorporated films when compared to pure PVA/starch film (478.3 degrees C). The mechanical properties of composite films varied due to composition. The tensile strength of pure PVA/starch films were reduced significantly from 27.74 to 16.56 MPa with betanin addition. The together addition of betanin (E-162) and nano-CaCO3 also reduced the tensile strength (14.77 MPa). The elongation at break values of betanin incorporated films (% 184.06-205.09) were reduced as compared with pure PVA/starch films (% 258.10). The additives caused a decrease in L* values (lightness reduction). The addition of betanin to PVA/starch film notably improved the antioxidant properties. The results demonstrate the convenience of the composite films for active and intelligent packaging applications.
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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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    Polyvinyl alcohol/chitosan composite films with pomegranate peel powder: Improved bioactivity and biodegradability
    (Elsevier, 2025) Isman, Nese; Sicak, Yusuf; Terzioglu, Pinar
    The fact that petroleum-derived plastic packaging has a very short lifespan that causes serious environmental problems. The interest in development of biocomposite films with suitable biodegradability is increasing day by day. In the present study, polyvinyl alcohol/chitosan (PVA/CS) bioactive composite films containing pomegranate peel powder (PPP) were developed by casting method. The PVA/CS films with PPP (1-3 % w/w) were investigated to determine the physical, mechanical, structural, barrier, soil biodegradability and antioxidant properties. Surface morphology was observed by SEM and peel powder integration to the structure was revealed clearly. It was observed that the tensile strength of PPP incorporated films (22.76 +/- 0.89-19.63 +/- 0.98 MPa) were lower than the neat film (35.03 +/- 2.67 MPa), whereas the elongation at break values of biofiller added films were higher. Additionally, the water contact angle values of the films ranged from 105.2 degrees +/- 0.56-83.1 degrees +/- 0.72, showing a decreasing trend with increasing pomegranate peel powder concentration. While the water vapor permeability of the films increased with higher pomegranate peel powder content, the water solubility values initially decreased. The alteration in color of films was detected with incorporation of pomegranate peel powder. Moreover, antioxidant activity reached its highest value (IC50:6.60 +/- 0.42 and 7.17 +/- 0.34 mu g/mL for DPPH and ABTS, respectively) with 3 % w/w PPP addition. According to soil burial test results, the 2 % w/w PPP incorporated films showed the highest biodegradability (similar to 67 %).