Yazar "Ongun, Göknur K." seçeneğine göre listele

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    Freeze- drying of carrot slices in diverse thicknesses
    (2021) Acar, Bahadır; Dagdeviren, Abdullah; Janaani, Ahmed; Roshanaei, Khandan; TaskeŞen, Edip; Ongun, Göknur K.; Özkaymak, Mehmet
    In this paper we dried carrots by the method of freeze-drying. The carrots had cut into slices; then\rdivided in halves. The mass looses of samples sized. The mass losses measured and recorded during the\rprocess. The sections were in 5 mm and 7 mm. Slices were dried with SCANVAC COOLSAFE. The masses of\rthe carrot slices differed also in each unit with the same mass and shape varied. Our team did the drying\rprocedures every two hours, also the experiment was applied at different temperatures. While evaluating\rthe number of carrot slices as samples for freeze-dried observed that, dried samples amount were 5\rtimes less than the number of carrots before drying. The procedure was applied to 10 different\rmathematical models using the MATLAB program. The error analysis of the models at the result made by\rusing the root-mean-square error (RMSE), chi-square (X2) and regression coefficients (R2). According to\rthe results, it was sdetermined that the results of the Page model were closer as the experimental results\rbe compared to other models. The statistical error values of samples for R2, RMSE respectively were\r0.018565707 for 5 mm and 0.019532936 for 7 mm
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    Kinetic model and effective diffusivity of frozen-dryed european blueberry (vaccinium myrtillus)
    (2022) Ayrıksa, Mutlucan; Acar, Bahadır; Dagdevıren, Abdullah; Roshanaeı, Khandan; Coşkun, Tuba; Ongun, Göknur K.; Özkaymak, Mehmet
    In current study, the freeze-drying (FD) method has been investigated. This method is the healthiest drying method that used in recent years by extending the shelf life of the products and preserving the beneficial flavors in its content. Antioxidant, antimicrobial, antidiabetic, anti-inflammatory, antiseptic, etc., are the most emphasized role among the berries. Thus, blueberry is one of the great aspects to be a case for drying. Blueberry (Vaccinium Myrtillus), which is an opulent source of many phenolic compounds with known properties, has been determined. In the study, blueberries by the weight of 100 g and with a thickness of 5 mm were placed in the drying device, and the data were processed by observing the weight loss every two hours after being subjected to the drying process for 14 hours. 8 different kinetic drying models were applied to the acquired data using the Matlab program. As a result of the application, the estimated standard errors (RMSE), chi-square (X2), regression coefficients (R2) were calculated, error analysis was performed, R2, X2, and RMSE values were found, as 1.4686 ×10-2, 2.875×10-4 and 9.978 ×10-1. According to these results, it was determined that the most suitable model is the Page model. Also, the effective diffusivity coefficients for blueberries were calculated as 2.57665 × 10-12 m2/s.