Yazar "Ozdemir, Sebahat" seçeneğine göre listele

Listeleniyor 1 - 5 / 5
  • Küçük Resim Yok
    Öğe
    Characterization of biodegradable bi-layer films from thermoplastic starch and poly-l-lactic acid
    (Wiley, 2024) Parlak, Mahmut Ekrem; Uzuner, Kubra; Ozdemir, Sebahat; Kirac Demirel, Fatma Tuba; Dundar, Ayse Neslihan; Sahin, Oya Irmak; Saricaoglu, Furkan Turker
    This study aimed to enhance the oxygen barrier properties of polylactic acid (PLA) film, a biodegradable packaging material with high oxygen permeability (OP). Bi-layer films were produced by coating thermoplastic starch (TPS) onto PLA films in various ratios while maintaining constant film thickness. The mechanical, optical, barrier, thermal, hydrophobicity, moisture sorption, and microstructural properties of the films were analyzed. Increasing the TPS ratio elevated moisture content (MC), water uptake, solubility, and opacity while enhancing UV barrier properties. TPS coating reduced tensile and burst strength but increased the burst deformation of the bi-layer films. Bi-layer film production resulted in a water vapor permeability increase of 59.26%-94.44% compared with neat PLA while decreasing OP by 2.52%-29.66%. The equilibrium moisture content (EMC) rose with higher TPS ratios, displaying type II isotherms. FTIR analysis indicated no chemical interactions between PLA and TPS. Increasing the TPS ratio decreased PLA crystallinity, supporting the mechanical and barrier properties of the bi-layer films. Neat and bi-layer films exhibited smooth, homogeneous surfaces, with a visible interface in the cross-section of the bi-layer films. In conclusion, TPS shows promise as an alternative to improve oxygen barrier properties in PLA films without adversely affecting other properties.
  • Küçük Resim Yok
    Öğe
    Characterization of pomegranate peel extract loaded nanophytosomes and the enhancement of bio-accessibility and storage stability
    (Elsevier Sci Ltd, 2023) Dundar, Ayse Neslihan; Ozdemir, Sebahat; Uzuner, Kubra; Parlak, Mahmud Ekrem; Sahin, Oya Irmak; Dagdelen, Adnan Fatih; Saricaoglu, Furkan Turker
    Nano-phytosomes are lipid-based nano-carriers and rapidly growing technology for products containing phytochemicals. In this study, pomegranate peel extract (PPE) loaded nanophytosomes (NP) were prepared with phosphatidylcholine (PC) based on thin layer hydration method. The characterization of NP such as entrapment efficiency (EE), particle size, poly-dispersity index (PDI),.-potential and microstructural properties was studied and in vitro bioaccessibility and storage stability of bioactive properties were investigated. The highest EE was determined as 94.99 %, indicating a unique ability as nano-carrier. PPE-loaded NPs showed good characteristics, such as lower PDI values (<0.5), lower particle size (166.70-144.40 nm), and spherical shape of microstructure. All NP complexes showed significant bioaccessibility with TPC, CUPRAC, and ABTS values >50 % in the intestinal medium. The lowest TPC and color difference (.E) during 28 days of storage were found at 4.C, although all NP samples showed better stability at all storage temperatures up to 21 days.
  • Küçük Resim Yok
    Öğe
    Nanophytosomes as a protection system to improve the gastrointestinal stability and bioavailability of phycocyanin
    (Elsevier, 2022) Sahin, Oya Irmak; Dundar, Ayse Neslihan; Ozdemir, Sebahat; Uzuner, Kubra; Parlak, Mahmud Ekrem; Dagdelen, Adnan Fatih; Saricaoglu, Furkan Turker
    Nano-phytosomes (NP), lipid-based nano-carriers, were used to encapsulate the phycocyanin. Phycocyanin (Phy) is known for its important biological properties with low bioavailability and low stability. The aim of the study was to prepare phosphatidylcholine (PC) based Phy loaded NP to overcome the bioavailability and storage stability issues. The characterization of NP such as entrapment efficiency (EE), particle size, poly-dispersity index (PDI), zeta-potential and microstructural properties was conducted and in vitro bioaccessibility and storage stability of bioactive properties were investigated. The highest EE was determined as 81.92% however with a loading capacity (LC) of 58.12%. Phy-NPs showed good characteristics, such as low PDI values (<0.5), low particle size (106.13-134.10 nm), and non-dense spherical shape of microstructure. All NP complexes showed significant bioaccessibility with total phenolic content (TPC) values greater than 50% in intestinal tract. Unfortunately, PC based NP did not show a clear-cut pattern of TPC and color protection of Phy via increased PC content.
  • Küçük Resim Yok
    Öğe
    Production and characterization of biodegradable bi-layer films from poly (lactic) acid and zein
    (Elsevier, 2023) Parlak, Mahmud Ekrem; Uzuner, Kubra; Kirac, Fatma Tuba; Ozdemir, Sebahat; Dundar, Ayse Neslihan; Sahin, Oya Irmak; Saricaoglu, Furkan Turker
    Recently, packaging industry has turned to biodegradable packaging, and poly(lactic acid) has become the most remarkable polymer. However, the high oxygen permeability of PLA films significantly limits their use. Therefore, this study, it was aimed to improve the oxygen barrier properties of PLA films without adversely affecting the mechanical and water vapor barrier properties. Biodegradable PLA-Zein bi-layer films were produced by changing PLA and zein thickness. Transparent and UV barrier bi-layer films were obtained. Mechanical properties of PLA films were improved by the production of bi-layer films. Water vapor permeability of bi-layer films increased whereas the permeance decreased with zein coating of PLA. Multi-criteria decision hierarchy was used to select the best bi-layer films based on mechanical, permeance, and opacity results. Oxygen barrier properties of PLA film significantly improved by zein coating, and hydrophobicity of PLA film was not affected by zein coating. The crystallization and melting temperatures of films decreased when compared to PLA films, supporting the mechanical results. Homogeneous, non-porous, and smooth film surface was obtained and zein layer was in good compatibility with PLA layer. These results suggest that zein coatings could be used to decrease oxygen permeability of PLA films without negatively affecting other properties.
  • Küçük Resim Yok
    Öğe
    Quality properties and bioactive compounds of reduced-fat cookies with bee pollen
    (Elsevier, 2022) Sokmen, Ozen; Ozdemir, Sebahat; Dundar, Ayse Neslihan; Cinar, Aycan
    Functional foods are among the new trends in gastronomy. In fact, this trend should actually be associated with the inclusion of functional foods in menus and the understanding of their importance in terms of culinary science and perspective. Bee pollen (BP) has been used as a dietary supplement and culinary ingredient for improving health since ancient times. The present study was aimed to evaluate BP in different proportions (5%, 10%, and 15%) in the production of reduced-fat cookies as a trendy product for food and culinary science. The physico-chemical properties, bioactive compounds (total phenolic content (TPC), antioxidant capacity (AC), bio-accessibility of TPC-AC, phenolic compounds, carotenoid content), and sensory evaluation of the cookies were analyzed. With the addition of BP moisture, ash, fat, protein content, spread ratio, a*, b* values of the cookies increased, while carbohydrate content, hardness, and L* values decreased. While the TPC of the fortified cookies ranged from 352.10403.34 mg/100g, the TPC of the control cookie was determined as 331.16 mg/100 g. The antioxidant capacity of cookies varies between 8.82-87.61 and 124.02-151.29 mu mole Trolox/g according to ABTS and DPPH method, respectively. According to the results, BP has positive effects on the quality criteria while improving the functional properties of cookies.