Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Author: search.filters.author.Berk, BerkayScopus Q: search.filters.scopusQuartile.Q2

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  • Article
    Citation - WoS: 2
    Application of Fractional Calculus-Based Anomalous Diffusion Model for Drying Analysis of Large Grapes Subjected To Micro-Perforation Pretreatment
    (Springer, 2025) Koroglu, Ebru; Berk, Berkay; Unluturk, Sevcan
    The study aimed to assess the potential of using needle micro-perforation pretreatment at various piercing lengths as an alternative to dipping in alkaline liquor solution for the hot air drying process of large grapes at temperatures of 60, 70, and 80 degrees C. Fick's second law and anomalous diffusion model based on the fractional calculus approach were used to analyze the drying curves and estimate effective diffusivity (D-eff). Needle micro-perforation on drying kinetics and some physicochemical properties (water activity, pH, titratable acidity, rehydration rate, shrinkage ratio, and color) of hot air dried Kavacik grapes (Vitis vinifera L. cv Alphonse Lavall & eacute;e) were investigated. The anomalous diffusion model fit the experimental data better and revealed super-diffusive behavior (alpha > 1). The effective diffusivity coefficients varied between 1.00 x 10(-10) to 6.47 x 10(-10) m(2)/s. The pretreatment at various piercing lengths showed no significant impact on water activity and color (P > 0.05). However, it did have a significant effect on pH, titratable acidity, rehydration rate, and shrinkage degree (P < 0.05). MG1.5 drying conditions at 60 degrees C were found to be the most suitable process conditions for achieving energy-efficient drying (high D-eff: 3.87 x 10(-10) m(2)/s) of grapes while preserving their highest-quality attributes related to drying (a(w): 0.54, RR: 1.95, pH: 4.31, Delta E: 3.38 and SR: 0.98). The results revealed that the needle micro-perforation pretreatment provided better color and water activity properties in dried grapes, and the drying time was reduced at even low temperatures. It has been shown that micro-perforation can be an environmentally friendly alternative method to chemical pretreatment in grape drying.
  • Article
    Citation - WoS: 8
    Citation - Scopus: 10
    Use of Magic Sandwich Echo and Fast Field Cycling Nmr Relaxometry on Honey Adulteration With Corn Syrup
    (John Wiley and Sons Inc., 2021) Berk, Berkay; Çavdaroğlu, Çağrı; Grunin, Leonid; Ardelean, Ioan; Kruk, Danuta; Mazı, Bekir G.; Öztop, Halil Mecit
    conventional time domain nuclear magnetic resonance (TD-NMR) pulse sequence: magic sandwich echo (MSE) was used to detect the adulteration of honey by glucose syrup (GS) and high fructose corn syrup (HFCS) accompanied with T-1 and T-2 relaxation times. Also, fast field cycling NMR (FFC-NMR) relaxometry and multivariate analysis were performed to investigate the adulteration. RESULTS Higher maltose in GS and changing glucose to water ratio of HFCS gave high correlation with the crystal content values. In HFCS adulteration, two separate populations of protons having different T-2 values were detected and T-1 times were also used to determine GS adulteration. Addition of GS increased T-1 while addition of HFCS increased T-2, significantly. CONCLUSION The results showed that it is possible to differentiate the unadulterated and adulterated honey samples by using TD-NMR relaxation times and crystal content values obtained by the MSE sequence. By FFC-NMR relaxometry, not only GS addition but also the amount of GS was examined. The multivariate analysis technique of principal component analysis was able to distinguish the types of adulterants.