Uygulama - Araştırma Merkezleri ve Koordinatörlükler

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Antioxidant and Antimicrobial Capacity of Quinic Acid
(Bitlis Eren Üniversitesi Fen Bilimleri Dergisi, 2022) Ercan, Leyla; Doğru, Mehmet
Recently, agents with natural antioxidant and antimicrobial properties have been popularly studied. For this purpose, phenolic compounds, terpenes, and organic acids are examined for their antioxidant and antimicrobial properties. Of these, organic acids are increasingly being used in pharmacology, medicine, food, and industry. Quinic acid is a natural organic compound found in many edible fruits and plants. In this study, the antioxidant effect of quinic acid, which has the structure of cyclohexane carboxylic acid, was determined in vitro using seven different methods (DPPH, ABTS, CUPRAC, DMPD, FRAP, Fe3+ reduction, and Total antioxidant method). In addition, its antimicrobial effect on fungi (C. albicans), gram-positive bacteria (S. aureus, S. pyogenes), and gram-negative bacteria (E. coli, K. pneumoniae, and P. aeruginosa) were determined by the disk diffusion method. As a result, it was found that quinic acid has broad-spectrum antimicrobial properties, but its antioxidant properties are too low to be highlighted. While its antimicrobial activity was quite good, especially on K. pneumoniae E. coli, S. aureus, S. Pyogenes, and P. aeruginosa, it did not show any effect on C. albicans. Although the antioxidant property of quinic acid is low, it showed more antioxidant properties in the DMPD method, which is one of these methods, because it dissolves very well in water.
Comparison of chemical and antimicrobial properties of different nanoparticles synthesized from Verbascum x calcicolum Hub.-Mor. Hybrid
(Elsevier, 2024) Ercan, Leyla; Günbegi Çalışkan, Emine; Kılıç, Murat
Recent advances in nanoparticle synthesis have led to an increase in the use of environmentally acceptable plant-derived nanoparticles, given their wide range of applications. Due to their stability and several advantageous characteristics, selenium nanoparticles also stand out in these investigations in addition to metallic nanoparticles like silver, gold, iron, and zinc. These nanoparticles' favorable qualities for human health, such as antioxidant and antibacterial activities, are being studied in addition to their chemical characteristics. This investigation aimed to produce zinc oxide nanoparticles (VcZnO) and selenium nanoparticles (VcSe) from hybrid Verbascum x calcicolum Hub.-Mor. And to examine their antioxidant and antimicrobial properties. Utilizing the disk diffusion method and well methods, its antibacterial capabilities were studied. In vitro antioxidant capabilities were also assessed utilizing the DPPH, FRAP, and CUPRAC techniques. As a result, it emerged that zinc oxide nanoparticles synthesized from hybrid Verbascum x calcicolum were effective on gram-positive bacteria and gram-negative bacteria such as Staphylococcus aureus (MIC = 160 mg/ml for VcZnO), Pseudomonas aeruginosa (MIC = 80 mg/ml for VcZnO), Klebsiella pneumoniae (MIC = 40 mg/ml for VcZnO and, MIC = 120 mg/ml for VcSe), Escherichia coli (MIC = 20 mg/ml for VcZnO). While selenium nanoparticles are more favorable in terms of antioxidant capabilities, zinc nanoparticles demonstrate stronger antibacterial properties than selenium nanoparticles. Thus, it has been discovered that the use of different nanoparticles of various plants can be more efficient in different applications. It has also been found that Verbascum x calcicolum is a material that can be used successfully in nanoparticle synthesis.
Prediction of Aspergillus parasiticus inhibition and aflatoxin mitigation in red pepper flakes treated by pulsed electric field treatment using machine learning and neural networks
(Elsevier, 2022) Akdemir Evrendilek, Gulsun; Bulut, Nurullah; Atmaca, Bahar; Uzuner, Sibel
Presence of aflatoxins in agricultural products is a worldwide problem. Because of their high heat stability and resistance to most of the food processing technologies, aflatoxin degradation is still a big challenge. Thus, efficacy of pulsed electric fields (PEF) by energies ranging from 0.97 to 17.28 J was tested to determine changes in quality properties in red pepper flakes, mitigation of aflatoxins, inactivation of aflatoxin producing Aspergillus parasiticus, reduction in aflatoxin mutagenity, and modelling of A. parasiticus inactivation in addition to aflatoxin mitigation. Maximum inactivation rate of 64.37 % with 17.28 J was encountered on the mean initial A. parasiticus count. A 99.88, 99.47, 97.75, and 99.58 % reductions were obtained on the mean initial AfG1, AfG2, AfB1, and AfB2 concentrations. PEF treated samples by 0.97, 1.36, 5.76, and 17.28 J at 1 μg/plate, 0.97, 1.92, 7.78, 10.80 J at 10 μg/plate, and 0.97, 1.92, 2.92, 4.08, 5.76, 4.86, 6.80, 9.60, 10.80, and 10.89 J at 100 μg/plate were not mutagenic. Modelling with gradient boosting regression tree (GBRT), random forest regression (RFR), and artificial neural network (ANN) provided the lowest RMSE and highest R2 value for GBRT model for the predicted inactivation of A. parasiticus, whereas ANN model provided the lowest RMSE and highest R2 for predicted mitigation of AfG1, AfB1, and AfB2. PEF treatment possess a viable alternative for aflatoxin degradation with reduced mutagenity and without adverse effect on quality properties of red pepper flakes.

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