Browsing by Author "Kilicer, Ali"

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A Novel Strategy for Au in Food Science: Nanoformulation in Dielectric, Sensory Properties, and Microbiological Quality of Fish Meat
(Elsevier, 2021) Cetinkaya, Turgay; Ceylan, Zafer; Meral, Raciye; Kilicer, Ali; Altay, Filiz
Fabrication of Au-zein-based nanomats (AuZ-Nm) was successfully carried out by using the electrospinning technique. The average diameters of Au were found as 530 +/- 377 nm within zein nanomats having 161 +/- 45 nm. The nanomats were used to delay the Total Mesophilic Aerobic Bacteria (TMAB) growth in the skinless fish fillets stored at 4 +/- 1 degrees C. Besides control samples, dielectric properties (epsilon' and epsilon '') of the skinless fish fillets treated with AuZ-Nm were revealed. During the 8-days-storage, sensory changes in the samples treated with AuZ-Nm were determined. Microbiological test demonstrated that the use of AuZ-Nm limited the TMAB growth up to similar to 1 log CFU/g (p < 0.05). epsilon' values of the fish samples treated with AuZ-Nm (changes from 76.47 to 54.29) were more stable as compared to untreated fish samples (p < 0.05). The changes in epsilon '' for control and nanotreated samples were 86.94% and 77.92%. The overall acceptability of the nanotreated samples was higher than the control samples. The stability of dielectric properties, limitation of microbiological spoilage, and also delaying of sensory deterioration of the fish fillets could be provided by using AuZ-Nm. In this respect, the use of Au-zein-based nanomats in the present study with the results could be playing a guiding role for further food studies.
Production of Pumice-Containing Nanofibers by Electrospinning Technique
(Sciendo, 2022) Kilicer, Ali
The scope of the study involves identifying the optimal means to effectively use the electrospinning technique to obtain pumice-containing nanofibers. Nanofiber containing pumice in a solution was electrospun to obtain smooth, cylindrical, bead-free, and ultrafine nanomaterials. The study also analyzed the molecular [Fourier transform infrared spectroscopy (FTIR)], thermal [differential scanning calorimetry (DSC)], zeta potential, size, polydispersity index [dynamic light scattering (DLS)], and surface [scanning electron microscope (SEM)] parameters of the pumice-containing nanofibers having JP6 (applied voltage: 6 kV) and JP12 (12 kV) properties. While the distance (10 cm), flow rate (0.8 mL/h), and other parameters of the electrospinning process were fixed, two different voltages were applied to obtain the pumice-containing nanofiber. The average diameter of the nanoencapsulated pumice produced at 6 kV was defined as 98.6 nm in gelatin nanomats with 31.8 nm. The average diameter of the nanocapsule pumice produced under a 12 kV voltage was found to be 85.8 nm, and the average diameter of the nanomats (non-nanoencapsulated) was 35.2 nm. The average zeta potential values of the pumice-containing nanofiber were also determined in the nanosize range. The JP6 and JP12 PDI values were determined as 0.165 and 0.566, respectively. Peaks characteristic of pumices as defined in the literature were observed in the FTIR results, while DSC analysis results revealed strong endo- and exothermic peaks.As a result of this study, it has been proved that pumice can be reduced to nanosize with the electrospinning technique and it is nanoencapsulated in nanofiber. When the obtained pumice-containing nanofiber was examined, it was determined that the surface area of the nanofiber was large and resistant to thermal heat.
Thermal and Surface Area Properties of Micro and Nano Sized Pumice
(Trans Tech Publications Ltd, 2023) Kilicer, Ali
Raw pumice samples were modified with nano carbon black, borax, and nano carbon-borax using the sol-gel method by applying surface modification processes, and the changes in the thermal behavior of the surface modification of the raw pumice were studied by characterizing them with FESEM, EDX, FT-IR, XRD, BET and TGA-DTA. In the analyses made with FE-SEM, it was observed that the surface and pore structure of the raw pumice changed after the modified process, and in the EDX analysis, it was determined that nano carbon black and borax adhered to the surface of the raw pumice. In the XRD results, no change in the crystal structure of the raw pumice was observed after the modified treatment. TGA-DTA analysis showed that the mass loss of raw pumice (P) was greater than pumice-nano carbon black (PC), pumice-borax (PB), and pumice-borax-nano carbon black (PBC). Accordingly, raw pumice showed a mass loss of approximately 25%, pumice-borax (PB) and pumice-nano carbon black (PC) 0.45%, and pumice-borax-nano carbon black (PBC) nearly 3%. According to the BET analysis results, it was determined that the raw pumice has a surface area of 28.126 m2/g. After the surface modification process, the surface area of the raw pumice was determined as 52.127 m2/g in the pumice-nano carbon black sample, 49.125 m2/g in the pumice-borax sample, and 32.523 m2/g in the pumice-borax-carbon black sample. Considering the data obtained, the best surface properties were showed in pumice-nano carbon black (PC). Research results showed that; the modification process with nano carbon black and borax changed the thermal behavior of raw pumice.