Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2025Scopus SJRQ2/r/munzur/2076
  Evaluation of poly(lactic acid) films incorporated with lemon peel extract oil for food packaging materials

  Ertekin, Özlem

  The effects of Citrus lemon peel extract oil (CLPEO) at different ratios (0%, 0.5%, 1.0% and 2.0%) on poly lactic acid blend films were evaluated concerning some properties of the films in this study. The antimicrobial effect of these films was determined against Escherichia coli, Enterococcus faecalis, Salmonella typhimurium, Bacillus cereus and Staphylococcus aureus according to the parallel stick method. Antioxidant properties of Citrus lemon peel extract oil were investigated using DPPH (2,2-diphenyl-1-picrylhydrazyl) and TEAC (trolox equivalent antioxidant capacity) method. The inhibition of DPPH for Citrus lemon peel extract oil was found to be as (84%), (76%), (71%), and (62%) for CLPEO, PLA2, PLA1, PLA0.5, respectively. Antibacterial effect was detected at CLPEO and PLA2 films, with CLPEO being important as an environmentally friendly packaging material in terms of antibacterial, antioxidant activity, FT-IR, SEM, WVP, opacity and mechanical properties.

  İncele
• MakaleYalnız künye2025Scopus SJRQ3/r/munzur/890
  Cotton Fabric and Polypropylene Fabrics Treated with Synthesized Zinc Diborate

  İpek, Yeliz; Ertekin, Özlem

  Cotton fabrics and polypropylene fabrics are mostly used fabrics in many areas. Zn(B4O7) powder was synthesized with a sequential wet precipitation and sintering method. Focused ion beam scanning electron microscopy (FIB-SEM) figures and energy dispersive X-ray spectroscopy (EDS) mapping results showed that zinc diborate was highly and homogeneously adsorbed on the surface of the treated fabrics. When differential thermal analysis (DTA) results were examined, heat release seemed to decrease by 0.71 kJ g−1, 0.61 kJ g−1, and 0.46 kJ g−1for cotton fabric treated with zinc diborate (C-117-ZB), polypropylene fabric (20 g m−2) treated with zinc diborate (PP-20-ZB), and polypropylene fabric (65 g m−2) treated with zinc diborate (PP-65-ZB), respectively. According to vertical burning test, burning rates of cotton fabric (C‒117), C‒117‒ZB, polypropylene fabric (PP‒65), PP‒65‒ZB, polypropylene fabric (PP‒20), and PP‒20‒ZB were calculated as 3.25 cm s−1, 1.93 cm s−1, 0.75 cm s−1, 0.36 cm s−1, 0.88 cm s−1, and 0.71 cm s−1, respectively. Heat releases and burning rate decreases were in good agreement for all treated fabrics. Also breaking strengths of both fabric types were improved. The washing test exhibited that the amount of zinc diborate powder on the cotton fabric sample was released by 25.49% while PP-65-ZB and PP-20-ZB fabrics released about 90% by weight of adsorbed powder. Although improvement was observed in the fire resistance of PP fabrics, antibacterial activity against Escherichia coli and Staphylococcus aureus could not be achieved. However, antibacterial activity was provided only for the cotton fabric.

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• MakaleAçık Erişim2024Scopus SJRQ2/r/munzur/2287
  Genotypic diversity and antagonistic activities of enterococci isolated from pastırma

  Ertekin, Özlem; Kaban, Güzin; Kaya, Mükerrem

  The biodiversity of enterococci from pastırma (a traditional Turkish dry-cured meat product) by genotypic identification and the antagonistic activities of strains were investigated. Pastırma samples taken from 20 different small-scale factories were subjected to microbiological and physicochemical analysis. A hundred enterococci isolates were identified by 16S rRNA gene sequence analysis. To determine antagonistic activity of strains, Listeria monocytogenes and Staphylococcus aureus were used. The lactic acid bacteria and Micrococcus/Staphylococcus counts were ≥ 6 log cfu/g in 55% of the samples and 75% of the samples, respectively. Enterobacteriaceae was generally below the detectable level (< 2 log cfu/g). The enterococci count was higher than 6 log cfu/g in 30–35% of the samples, depending on the medium used. The enterococci isolates (100 isolates) were identified as E. faecium (80 strains), E. faecalis (19 strains) and E. hirae (1 strain) in genotypic identification. The nine E. faecium strains showed antagonistic activity against L. monocytogenes in the well diffusion test. In contrast, in the same antagonistic activity test, all of the strains had no antagonistic activity against S. aureus. Further studies could be planned to characterize E. faecium strains that show antagonistic activity against L. monocytogenes.

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  AtıfScopus2·WoS2·OpenAlex1

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• MakaleYalnız künye2024Scopus SJRQ1/r/munzur/1874
  Physical and biological characteristics of eco-friendly films added with Cinnamomum zeylanicum extract for packaging materials

  Gürler, Nedim; Ertekin, Özlem

  The effects of Cinnamomum zeylanicum extract (CZE) at different rations (0%, 1%, 3% and 5%) on gelatin (GL)–polyvinyl alcohol (PVA) blend films were evaluated in relation to the structural, tensile strength, physical, antimicrobial and antioxidant properties of the films in this study. The results showed that water barriers of the film samples decreased, but the UV-blocking property increased and became opaque at the highest GLPVA5 film. The tensile strengths of GLPVA, GLPVA1, GLPVA3 and GLPVA5 films were 1.21, 1.78, 1.62 and 1.95 MPa, respectively. The antimicrobial effect of these films was determined against Escherichia coli, Enterococcus faecalis, Salmonella typhimurium and Bacillus cereus according to the parallel stick method. Antioxidant properties of cinnamon extract were investigated using 2,2-diphenyl-1-picryl-hydrazil (DPPH) methods. The % inhibition of DPPH was found to be 82.00. No antibacterial effect was detected for B.cereus and E. faecalis at 0%, 1%, 3% and 5%. While no activity was observed in 0%, 1% and 3% cinnamon, 7.5 and 3.0 mm zones were detected in S. typhimirium and E. coli, respectively, in 5% cinnamon. The results suggest that the film samples could be used in a potential packaging with antioxidant and antibacterial properties.

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  AtıfScopus9·WoS9·OpenAlex7

  İncele
• MakaleYalnız künye2021Scopus SJRQ2/r/munzur/2914
  Developing Antibacterial Cotton Fabric with Zinc Borate Impregnation Process

  İpek, Yeliz; Ertekin, Özlem

  Cotton fabric is a commonly used textile because of its natural and healthy properties. The chemical structure of cotton consists cellulose with a ratio of over 90 %. Cellulose is a natural polymer and cotton fabric is a quiet useful textile because of its better moisture absorption, softness, and easy care properties. Moisture absorbtion property comes from the cellulosic structure of the fabric. However, its features such as being hydrophilic and inclinable to bacterial growth limits its application areas. Antibacterial cotton fabric may be used for hospital textiles such as hospital gowns, patient clothes, wound bandages; food packaging and storage textiles; home textiles like curtain, bed cover; clothing, etc. In this study, a novel environmentally friendly antibacterial cotton fabric was developed. Flame retardant zinc borate was used as antibacterial agent. For this purpose, zinc borate with a formula of ZnO·3B2O3·7H2O had been synthesized with wet chemical precipitation method and cotton fabric was treated with this material via sol-gel impregnation method. The impregnation method for cotton fabric provided a uniform distribution of zinc borate particles and processing the entire volume of the fiber. This method is also suitable for large quantity production processes. In the microbiological studies, Enterococcus which is commonly associated with the nosocomial infections and food spoilage was used. As a result, the antibacterial activity was observed in the fabrics treated with 0.1 mol·l−1 and 0.2 mol·l−1 concentration of zinc borate solutions.

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  AtıfScopus16·WoS13·OpenAlex14

  İncele
• MakaleAçık Erişim2020Scopus SJRQ3/r/munzur/3783
  Modeling of Drying Processes of Dates (Phoenix, Arecaceae) with Oven or TGA and Microbiological Properties of Fresh and Dried Dates

  Ertekin, Özlem; İpek, Yeliz

  Drying method, which is one of the oldest preservation methods, is important for preserving fruits. Date palm fruit is an important food in human nutrition due to some vitamins, minerals, sugar, phenolic components, and high fiber content. In the literature, date palm drying was not studied sufficiently in the aspect of mathematical modeling and the effect of drying process on the microbiological properties. In this novel study, date palm drying process was applied with four different temperatures of 50°C, 70°C, 90°C, and 110°C with two different drying techniques; drying with oven and drying with thermogravimetric analysis (TGA). Chemical changes in the date palm structure after drying at different temperatures were investigated with FTIR analysis. Fibrous structure of palm fruit is also exhibited with SEM analysis. On the other hand, microbiological studies were applied both for fresh and dried date palm to observe the drying process effect on the growth of different types of microorganisms. Consequently, drying time decreased with increasing drying temperature while the color of the dried date palm fruit became darker with increasing temperature. However, the chemical structure was not affected. Drying time of oven drying technique was longer than drying with TGA technique. The mathematical model of the drying temperature depending on drying time is calculated as (Formula presented.) for TG-DTA drying experiments and (Formula presented.) for drying process with oven. In addition, the microbiological load has significantly decreased or disappeared with the drying process.

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  AtıfScopus6·WoS6·OpenAlex6

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