Browsing by Author "Sen, Yasin"

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Citation - WoS: 59
Citation - Scopus: 66
Detoxification of Hazelnuts by Different Cold Plasmas and Gamma Irradiation Treatments
(Elsevier Sci Ltd, 2019) Sen, Yasin; Onal-Ulusoy, Baran; Mutlu, Mehmet; 01. Atılım University
The detoxification effects of cold atmospheric-pressure (AP,3000 L/h of air, 25 kHz, 655 W-1.7 min) and low-pressure (LP,air-100 W-30 min) plasmas and gamma irradiation(GMI,10 kGy-10 min) treatments on different concentrations of pure aflatoxin B1(AFB1) and AFB1 + B2 (TotAFs) as well as same toxins spiked on hazelnut were investigated. Both plasmas reduced 72-73% of AFB1 (3 ppb) spiked on hazelnuts while GMI reduced 47% of AFB1. TotAFs (6 ppb) reductions on hazelnut after both plasmas were 70-71%, which was also higher than that of GMI (15.5%). However, the reductions in pure AFB1 at 1-50 ppb and TotAFs at 1.03-51.5 ppb after GMI (97-100%) were higher than those of AP (55-75%) and LP (69-90%) plasmas. AP plasma has the potential to be an alternative to conventional detoxification methods because it is both effective on aflatoxins in foods and maintains the sensory attributes of food evaluated by a sensory panel. Industry relevance: The use of plasma technology in foods for detoxification purposes is an economic alternative to conventional and other non-thermal processes as well as meeting the industry's demand for sustainable development. This study showed that different cold plasmas are capable of reducing the aflatoxins as pure forms as well as in food. The results contributed to the understanding of cold plasma detoxification effects on aflatoxins and could be a basis for a possible industrial implementation.
Citation - WoS: 39
Citation - Scopus: 51
aspergillus Decontamination in Hazelnuts: Evaluation of Atmospheric and Low-Pressure Plasma Technology
(Elsevier Sci Ltd, 2019) Sen, Yasin; Onal-Ulusoy, Baran; Mutlu, Mehmet; 01. Atılım University
The decontamination effects of non-thermal atmospheric-pressure (AP) and low-pressure (LP) plasma systems were investigated on hazelnuts artificially contaminated with Aspergillus parasiticus and Aspergillus flavus spores. Furthermore, AP-plasma treatment conditions were also optimized. Spore reductions of 5.6 and 4.7 log cfu/g in Aspergillus parasiticus and Aspergillus flavus, respectively, were achieved after 100 W-30 min of LP-air-plasma treatment. Similarly, 5.5 and 5.4 log cfu/g of reductions in Aspergillus parasiticus and Aspergillus fiavus, respectively, were achieved after AP-air-plasma treatment at 3000 L/h of gas flow rate, frequency of 25 kHz and reference voltage of 100% (655 W) for 5-cycles (1.7 min). Deformation of spores and loss of spore integrity after plasma treatments were demonstrated with scanning electron microscope (SEM). This study showed that LP and AP plasma treatments might be an alternative method for inactivation of aflatoxin- producing fungi. Industrial relevance: Non-thermal (cold) plasma is a promising technology for decontamination of foods due to its safety, ease of use and low temperature processing capability. The results of this study showed that plasma system can be incorporated into a food processing chain, and when initial Aspergillus spp. spores were 7.8-7.9 cfu/g in hazelnut, plasma treatment with reductions of up to 5.6 log cfu/g can compete with other decontamination methods.
Citation - WoS: 13
Citation - Scopus: 13
In Vitro and in Vivo Bacterial Antifouling Properties of Phosphite of Plasma-Treated Silicone
(Ice Publishing, 2019) Akdogan, Ebru; Demirbilek, Murat; Sen, Yasin; Onur, Mehmet Ali; Azap, Ozlem Kurt; Sonmez, Erkin; Mutlu, Mehmet; 01. Atılım University
In order to improve their bacterial antifouling property, silicone surfaces were functionalized through the plasma polymerization (PP) technique using diethyl phosphite as the precursor. The functionalized surfaces were characterized using contact angle measurements, contact angle titration, Fourier transform infrared-attenuated total reflection spectroscopy and in vitro cytotoxicity assay. The amount of non-specific protein adsorption and the conformational changes of surface-adsorbed proteins were investigated. Antifouling properties of the surfaces were evaluated in vitro and in vivo. PP functionalization generated a hydrophilic and amphoteric surface with a very good protein and bacterial antifouling property and caused less conformational changes on the secondary structure of surface-adsorbed proteins. In in vivo conditions, no slime layer was formed around bacteria that adhered on the PPfunctionalized surface. It is concluded that the amphoteric nature of the PP-functionalized surface is the reason for the good antifouling property.
Citation - WoS: 18
Citation - Scopus: 18
Quality Changes of Hazelnut Kernels Subjected To Different Cold Plasmas and Gamma Irradiation Treatments
(Elsevier, 2019) Onal-Ulusoy, Baran; Sen, Yasin; Mutlu, Mehmet; 01. Atılım University
In this study, physicochemical parameters of hazelnuts after atmospheric-pressure (AP:air, 3000 L/h, 655 W, 25 kHz, 1.7 min) and low-pressure (LP:air, 25 Pa, 100 W, 13.56 MHz, 30 min) cold plasmas, and gamma irradiation (GMI:10 kGy, 10 min) treatments, and untreated and treated hazelnuts after accelerated storage for 30 days(60 degrees C) were investigated. All treatments significantly reduced moisture (26-47%), a(w) (16-48%), oil (13-15%), soluble phenolic content (SPC; 26-36%) and total tocopherols (TT; 8-38%) compared to untreated hazelnut (Control-1) while no significant changes determined between treatments and Control-1 in terms of L*a*b*, protein, total sugars (TS) and total phenolic compounds. However, TS of all treatments after storage were significantly increased (3.2-33%) while aw (7-27%) and TT (13-31%) of all treatments were significantly decreased compared to both Control-2 and before storage (p < 0.05). Among treatments, cold plasmas showed great potential for conservation of most tested parameters.