Browsing by Author "Karakas, Canan Yagmur"

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Determination of Textural Deterioration in Fish Meat Processed With Electrospun Nanofibers
(Wiley, 2020) Ceylan, Zafer; Meral, Raciye; Alav, Aslihan; Karakas, Canan Yagmur; Yilmaz, Mustafa Tahsin
Nano-applications are named as one of the novel methods, which provide many advantages like a larger contact area on the surface of fish fillets with less material. The goal of the study was to reveal the textural profile changes correlated with TPB growth of fish fillets coated with nanofibers having 2.47 +/- 0.68 mV zeta potential value and 172 nm diameter. The difference of TPB count between control (CS) and the fish fillets treated with nanofibers (NG) reached 3.45 log CFU/g (p < .05) on the sixth day. The hardness value of CS was decreased (p < .05) (the decline: 68%) while the hardness of NG was found to be much more stable (the change: 42%). The highest change in springiness for CS and NG samples was determined as similar to 24 and similar to 15%, respectively, for 12 days. Cohesiveness values of CS were slightly increased, but those of the fish fillets coated with nanofibers were remarkably decreased. The coefficient of correlation analysis between TPB count and cohesiveness values was determined as "r= -.026 andr= .796" for CS and NG, respectively. Chewiness values of CS were significantly decreased (p < .05). However, chewiness values of the fish fillets coated with nanofibers were found as much more stable (p > .05). The results revealed that nanofiber coating limited the increase of TPB in fish fillets; it also better kept the textural profile of fish fillets as compared to CS stored at 4 degrees C. The study could play a guiding role in further food nanotechnology applications in the industry and food science.
A New Application on Fatty Acid Stability of Fish Fillets: Coating With Probiotic Bacteria-Loaded Polymer-Based Characterized Nanofibers
(Wiley, 2018) Ceylan, Zafer; Meral, Raciye; Cavidoglu, Isa; Karakas, Canan Yagmur; Yilmaz, Mustafa Tahsin
The effect of coating with Lactobacillus rhamnosus-loaded poly[vinyl] alcohol and sodium alginate-based nanofibers (LR) and also poly(vinyl) alcohol and sodium alginate-based nanofiber (PS) on fatty acid stability of fish fillets was tested. LR and PS dope solutions were successfully electrospun. Scanning Electron Microscopy images of nanofibers, with 60.09 nm < diameter of nanofibers <522.1 nm, were defined to be smooth, cylindrical, and ultrafine. Thermal decomposition of LR and PS were determined as higher than 200 and 300 degrees C, respectively by Differential Scanning Calorimeter. Nanofibers could be used to keep the stability of Polyunsaturated fatty acids (PUFA)s such as eicosapentaenoic acid and docosahexaenoic acid in fish fillets. Besides PUFAs, the rapid changes in predominant Monounsaturated fatty acids (MUFA) value like oleic acid in fish fillets coated with LR and PS were successfully limited as compared to the uncoated samples. Polyene index and predominant saturated fatty acids values (C16:0, C18:0, and C14:0) of the samples coated with LR and PS were found to be more stabile. Furthermore, the sharply decrease in omega-3/omega-6 ratio of fish fillets was limited. Loading LR to PS provided higher atherogenic and thrombogenic index. The use of probiotic bacteria-loaded polymer-based characterized nanofibers has been determined to be a new application for the fatty acid stability of fish. Practical applications Applied tests revealed differences between the fatty acid profile of uncoated and coated samples. Enrichment of PS and NaAlG-based nanofibers with Lactobacillus rhamnosus provided better stable in terms of PUFA and MUFA in fish fillets.
A Novel Strategy for Probiotic Bacteria: Ensuring Microbial Stability of Fish Fillets Using Characterized Probiotic Bacteria-Loaded Nanofibers
(Elsevier Sci Ltd, 2018) Ceylan, Zafer; Meral, Raciye; Karakas, Canan Yagmur; Dertli, Enes; Yilmaz, Mustafa Tahsin
Nanoencapsulation of probiotic bacteria (L. rhamnosus) into poly(vinyl alcohol) & sodium alginate-based nanofibers (VSPBe) and also the production of poly(vinyl alcohol) & sodium alginate-based nanofibers (VS) were successfully obtained. VSPBe and VS nanofibers were used to limit the Total Mesophilic Aerobic Bacteria (TMABc), Psychrophilic Bacteria (TPBc) and also Yeast and Mold count (TYMc) growth in the fish fillet. Dispersion stability potential -6.29 mV and -7.74 mV, for VS and VSPBe, respectively), thermal decomposition (a reduction in mass of VS and VSPBe at temperatures 50 degrees C, corresponding to < 5% and > 5%, respectively) and morphological properties of nanofibers (diameters between 60 nm and 580 nm) were revealed by characterization analysis. Microbiological tests demonstrated that VS and VSPBe were effectively delayed the TMABc and TPBc growth in fish fillets up to 38%. However, the antimicrobial effects of nanofibers were not pronounced for TYM growth in the fish fillet. The viability of probiotic bacteria could be provided after electrospinning process and the use of L. rhamnosus-loaded nanofibers for delaying microbial growth in the fish fillets could be evaluated as a natural/novel technique.