Papers by Pınar Terzioğlu
Springer eBooks, Nov 14, 2021
Selcuk University Journal of Engineering, Science and Technology, Mar 1, 2023
Gıda endüstrisi atığı olan elma kabuğu polimer katkısı olarak değerlendirildi. Elma kabuğu ve... more Gıda endüstrisi atığı olan elma kabuğu polimer katkısı olarak değerlendirildi. Elma kabuğu ve/veya mikrokristalin selüloz katkılı filmler geliştirildi. PLA esaslı biyokompozitler çevre dostu paketleme uygulamaları için adaylardır.
Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi
Fibrous materials from polylactic acid (PLA) and polyvinylpyrrolidone (PVP) containing mandarin p... more Fibrous materials from polylactic acid (PLA) and polyvinylpyrrolidone (PVP) containing mandarin peel essential oil (MPEO) and/or nano-calcium carbonate were prepared by electrospinning process. The electrospun webs were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and microbiological tests. IR spectra results indicated the existence of interaction among additives and polymer matrix. Obtained SEM results showed that incorporation of essential oil to the polymer matrix have a remarkable effect on the fiber morphology. Essential oil incorporation increased the fiber diameters. The electrospun composite webs were ineffective against Acinetobacter baumannii, Bacillus subtilis, Escherichia coli, Enterococcus fecalis, Klebsiella pneumoniae, Pseudomonas aeruginosa and Staphylococcus aureus.
Eurasian journal of biological and chemical sciences, Dec 29, 2020
Biyobozunur ambalaj endüstrisi, petrol esaslı plastiklerin yol açtığı atık bertaraf sorunlarının ... more Biyobozunur ambalaj endüstrisi, petrol esaslı plastiklerin yol açtığı atık bertaraf sorunlarının önlenmesi ihtiyacı nedeniyle sürekli büyümektedir. Son yıllarda, biyobozunur ve aktif ambalajların geliştirilmesine yönelik çalışmalar artmaktadır. Bu çalışmada, polifenollerce zengin biberiye (Rosmarinus officinalis L.) ekstresi ve kaolinin polivinil alkol/mısır nişastası esaslı filmlerin özelliklerine olan etkisi incelendi. Filmlerin yapısal özellikleri FT-IR analizi, mekanik özellikleri çekme testi, morfolojik özellikleri optik mikroskop ile belirlendi. Filmlerin şişme davranışları incelendi. Ayrıca, ABTS ve DPPH radikali giderme aktivitesi ile antioksidan aktivitesi belirlendi. Ekstre ve kilin birlikte ilavesi filmin mekanik özelliklerini iyileştirirken su absorpsiyonunu da arttırdı. Ekstre ilavesi ile filmler antioksidan aktivite sergiledi. Sonuçlar bu filmlerin aktif ambalajlama uygulamalarında potansiyel adaylar olarak değerlendirilebileceğini gösterdi.
Celal Bayar Universitesi Fen Bilimleri Dergisi, 2020
Chitosan is an attractive polysaccharide obtained by deacetylation of an abundant natural biopoly... more Chitosan is an attractive polysaccharide obtained by deacetylation of an abundant natural biopolymer called chitin. Chitin and chitosan are excellent materials. To improve the potential of chitin and chitosan modification is needed. In the present study, grafting of maleic acid on to chitosan by cerium ammonium nitrate in acetic acid solution was investigated with use of a microwave and reflux system. The grafted chitosan was characterized by using a Fourier-transform infrared spectrometry. The solubility and swelling behavior of grafted chitosans were determined in acetate buffer (pH 3.6), citrophosphate buffer (pH 5.6 and pH 7.0), and boric buffer (pH 9.2) solutions. The sample obtained by microwave system with use of a chitosan/maleic anhydride/ceric ammonium nitrate 0.2/3.922/0.99 gram of raw material within 30 minute showed the maximum swelling ratio (13.6) in boric buffer solution.
Wheat is the world's second most produced grain because of its high consumption rate, easy gr... more Wheat is the world's second most produced grain because of its high consumption rate, easy growth, multipurpose use and important role in the human diet. Every year, abundant amounts of wheat hull are obtained after shell process of the wheat as a waste material. Wheat hull, a by-product of the food industry, has low economic value. The utilization of wheat hull ash in various areas of industry can contribute to both financial and waste management strategies. In the present study, wheat hull ash that contains a high proportion of silica (43.22%), was utilized for barium and calcium silicate production. The wheat hull ash based barium and calcium silicate had a BET surface area of 30 and 54 m/g, respectively. There has been no research on barium and calcium silicate production from wheat hull. So, this study will present originality on this area.
International Journal of Green Energy, 2014
ABSTRACT Ultrasonic irradiation is considered an effective way to increase mass transfer between ... more ABSTRACT Ultrasonic irradiation is considered an effective way to increase mass transfer between immiscible liquid–liquid phases in a heterogeneous system leading to faster transesterification and higher yield and saving excess methanol and catalyst. In this study, the transesterification of hazelnut oil with methanol and ethanol was performed in the presence of potassium hydroxide or sodium methoxide as a catalyst using two types of ultrasonic irradiation with a probe (20 kHz, 200 W) and a bath (35 kHz, 400 W); a conventional production method was also used. The reaction time, alcohol:oil molar ratio, catalyst type (KOH or NaOCH3), and catalyst amount (wt.% of oil) were studied as experimental parameters. The highest methyl ester conversion was obtained as 98.12% by using ultrasonic probe at a 5:1 methanol:oil molar ratio with KOH 1 wt.% of oil as catalyst in 20-min reaction time at autogenous temperature. The application of ultrasonic irradiation by using a probe decreased the level of energy consumption, showing that this method may be a promising alternative compared with the conventional production method.
Journal of Polymers and the Environment
Advanced Science Letters, 2013
Journal of Natural Fibers, 2021
Organic–inorganic hybrid materials are promising candidates for biomedical applications. In this ... more Organic–inorganic hybrid materials are promising candidates for biomedical applications. In this study, chitosan, gelatin, and stearic acid coated nano-CaCO3 were electrospun to fabricate non-woven fibrous mats. The prepared chitosan/gelatin/nano-CaCO3 fibers with different CaCO3 contents (0%, 1%, 3%, and 5% w/v to polymer solution) were examined in terms of morphology, structure, thermal behavior, and antibacterial activity. Fourier-transform infrared spectroscopy results confirmed the formation of electrostatic interactions between chitosan, gelatin, and CaCO3. Chitosan/gelatin/nano-CaCO3 could be successfully electrospun into nanofibers with average fiber diameters between 184 ± 45 and 237 ± 55 nm and enhanced thermal stability. Electrospinning biopolymer blend with added calcium carbonate at higher concentration (3–5%) resulted in the formation of antibacterial fibers against B. subtilis, C. albicans, K. pneumonia, and S. aureus. According to all these favorable features, electr...
Biyokomurun polimer kompozitlerde kullanilmasi, atigin katma degerli bir malzeme olarak degerlenm... more Biyokomurun polimer kompozitlerde kullanilmasi, atigin katma degerli bir malzeme olarak degerlenmesini saglayan ve ayni zamanda biyo-atigi akillica azaltan surdurulebilir bir yaklasim olarak dusunulebilir. Bu calisma, polivinil alkol /misir nisastasi kompozitlerinde biyokomurun dolgu maddesi olarak degerlendirilmesine odaklanmistir. Kompozitler, plastiklestirici olarak sitrik asit ve capraz baglayici olarak glutaraldehit kullanilarak cozelti karistirma ve dokum yontemi ile hazirlandi. PVA / nisasta matrisindeki biyokomur dagilimi optik mikroskop ile degerlendirildi. Kompozitlerin yapisal ozellikleri FTIR spektroskopisi kullanilarak karakterize edildi. Biyokomur oraninin (agirlikca %0-12) PVA/nisasta karisiminin isil kararliligi uzerindeki etkileri diferansiyel taramali kalorimetre ve termogravimetrik analizle belirlendi. PVA/nisasta /biyokomur kompozitlerin bozunma sicakliklari, PVA/nisasta kompozitlerine kiyasla azaldi.
Journal of Innovative Science and Engineering (JISE)
The chitosan/gelatin/biochar biocomposite beads were prepared via the use of the emulsion crossli... more The chitosan/gelatin/biochar biocomposite beads were prepared via the use of the emulsion crosslinking method in the presence of poly(ethylene) glycol as a crosslinker. The effects of different ratios of biochar (1 and 5%) on the characteristics of the beads were evaluated by scanning electron microscopy (SEM) and energydispersive X-ray spectroscopy (EDS), thermogravimetric analysis (TGA) and Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) and swelling studies. The FT-IR results showed the interactions of biochar and polymer matrix. The prepared beads showed good swelling properties and different morphologies. The average diameter of neat chitosan/gelatin beads was almost 725 µm, while the average diameter of 1% and 5% biochar incorporated beads were 726 µm and 597 µm, respectively. The swelling capacity of the beads was decreased from 4671% to 2092% when the biochar incorporation ratio increased from 1% to 5%. This indicated that the preparation of beads with varying properties can be achieved by controlling the biochar amount. The beads may be evaluated in various applications as polymeric carrier systems and adsorbents.
Journal of Bioprocessing & Biotechniques
Biodiesel - Feedstocks, Production and Applications, 2012
Journal of the Institute of Science and Technology, 2021
Active food packaging films has gain more significance over conventional packaging. In this study... more Active food packaging films has gain more significance over conventional packaging. In this study, novel active composite films were prepared by incorporating lemon peel to a polyvinyl alcohol-starch matrix. The morphological, thermal and antioxidant activity evaluation of polyvinyl alcohol-starch-lemon peel composite films were discussed to determine whether the presence and content of lemon peel influenced the film’s characteristics. The results indicated that tested properties of composite films depended on the content of lemon peel. It was found that the thermal stability and antioxidant activity of films considerably improved upon the incorporation of peel. The prepared films with enhanced antioxidant activity may be used for preservation of oxidation-sensitive food products. The results showed that lemon by-product has great potential to be evaluated into added-value products for functional packaging applications. The developed packaging films will be new alternatives for food...
Advanced Functional Porous Materials
Food Packaging and Shelf Life
Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi
The utilization of biochar in polymer composites can be considered as a sustainable approach that... more The utilization of biochar in polymer composites can be considered as a sustainable approach that provide valorization of a waste to a value-added material and at the same time diminish biowaste in a smart way. This study is focused on the evaluation of biochar as a filler in polyvinyl alcohol /corn starch composites. The composites were prepared via solution mixing and casting method using citric acid as a plasticizer and glutaraldehyde as a cross-linker. Distribution of biochar in the PVA/starch matrix was evaluated by optical microscopy. The structural features of composites were characterized using FTIR spectroscopy. Effects of biochar loading ratio (0-12 wt%) on the thermal stability of the PVA/starch blends were determined by differential scanning calorimetry and thermogravimetric analyses. The decomposition temperatures of the PVA/starch/biochar composites decreased in comparison to PVA/starch composites.
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Papers by Pınar Terzioğlu