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Your search keyword '"Selma Kayacan-Cakmakoglu"' showing total 7 results
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7 results on '"Selma Kayacan-Cakmakoglu"'

1. Characterization of different orchid species and rheological properties of orchids solutions

Author

Aysen DEVELIOGLU-ARSLAN, Osman SAGDIC, Zeynep H. TEKIN-CAKMAK, Salih KARASU, Selma KAYACAN-CAKMAKOGLU, and Mustafa YAMAN

Subjects
bioactive, methanol and ethanol extracts, physicochemical, rheological properties, salep, Forestry, SD1-669.5, Agriculture (General), S1-972
Abstract

This study investigated the physicochemical, bioactive, and rheological properties of salep obtained from ten different wild orchids collected from different regions of Turkey (Anacamptis pyramidalis, Orchis isaura, Anacamptis palustris subsp. palustris, Orchis morio, Serapias vomeracea subsp. artemisiae, Orchis italica, Ophrys mammosa, Orchis sancta, Dactylorhiza euxina, Ranunculus ficaria subsp. calthifolius, and commercial salep). Firstly, the salep samples were ground and their color, pH, bioactive components, and FTIR spectrum were determined. The color and pH properties of salep differed due to the different species (p≤0.05). Two strong peaks were observed at 1618 and 1422 cm-1 due to asymmetric and symmetric stretching of the ester groups in salep glucomannan. According to salep species, there was a significant difference in the TPC (total phenolic content), % DPPH (2,2-diphenyl-1-picrylhydrazyl) scavenging activity, and CUPRAC values (p≤0.05), which were 5.29-26.84 mg GAE/g, 5.02-12.2%, and 0.81-3.82 mg TE/g, respectively. The FTIR findings revealed that the spectrum peaks did not change between commercial salep and other salep species. In the second part of the study, we prepared 1%, 2%, and 3% aqueous solutions of salep and examined their flow behavior, dynamic rheological properties, and 3-ITT (3-Time Interval Thixotropic Test) rheological behavior. A significant difference was observed between the values (p≤0.05). All salep solutions had a flow behavior index (n) value below 1, indicating that all samples exhibited shear-thinning behavior. The consistency coefficient (K) value significantly changed (p≤0.05) and was determined to be 0.003-2.91 Pa.sn, 0.003-28.81 Pa.sn, and 0.017-94.134 Pa.sn at salep concentrations of 1%, 2%, and 3%, respectively. Salep is a preferred stabilizer due to its functional properties, bioactive components, and polysaccharide structure. As a result, when the rheological properties of salep samples are evaluated, it is shown that especially Anacamptis pyramidalis, Orchis morio, Orchis sancta species can be used as stabilizers in the food industry.

Published
2024
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2. Effect of the different infrared levels on some properties of sage leaves

Author

Selma Kayacan-Cakmakoglu, Ilker Atik, Perihan Akman, Ibrahim Doymaz, Osman Sagdıc, and Salih Karasu

Subjects
General Chemical Engineering
Abstract

This study aims to investigate the effect of different infrared powers (IP) (38 W, 50 W, 62 W, 74 W, and 88 W) on drying kinetics, total phenolic content (TPC) and individual phenolics, antioxidant activity (AA) and antibacterial activity, and color quality of sage leaves. IP level significantly affected (p0.80). This study suggested that sage leaves should be dried at 88 W regarding lower drying times and color changes, lower phenolic degradation, and higher antibacterial activity.

Published
2023
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3. Optimization of Growth Conditions for the Production of Bacillus subtilis Using Central Composite Design and Its Antagonism Against Pathogenic Fungi

Author

Meyrem Vehapi, Benan İnan, Selma Kayacan-Cakmakoglu, Osman Sagdic, and Didem Özçimen

Subjects
Molecular Medicine, Molecular Biology, Microbiology
Abstract

Today, the enhancement of spore yields of Bacillus subtilis has considerable interest and has been widely investigated. In this context, studies have been carried out to improve the spore yield as well as the production amount. In order to perform this, optimization studies are conducted for large-scale production of B. subtilis in bioreactors. The prokaryotic structure, high extracellular production potential, lack of pathogenic activity, well-known fermentation technology and short fermentation time are the prominent advantages for the production of B. subtilis in a bioreactor. The Bacillus species produce a wide variety of antifungal and antimicrobial compounds, making them ideal biological control agents. In this study, first, the growth conditions of the medium were investigated and then optimized using the central composite design approach to achieve the highest productivity for the growth of B. subtilis. In the experiments, the effect of temperature of 25, 30 and 35 °C and pH level of 6.0, 7.0 and 8.0 on spore yield was studied. Moreover, the antifungal activity of the B. subtilis culture was investigated against pathogenic fungi: Colletotrichum gloeosporioides, Botrytis cinerea and Aspergillus brasiliensis.

Published
2022
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5. Production of Bacillus subtilis soil isolate as biocontrol agent under bioreactor conditions

Author

Meyrem Vehapi, Benan İnan, Selma Kayacan-Cakmakoglu, Osman Sagdic, and Didem Özçimen

Subjects
Antifungal Agents, Bioreactors, Genetics, Bacillus, General Medicine, Molecular Biology, Biochemistry, Microbiology, Bacillus subtilis, Plant Diseases
Abstract

This study aimed to investigate the biomass production of Bacillus subtilis in flask and bioreactor conditions. It is necessary to carry the culture from the shake flask to the pH, air, temperature and stirring controlled bioreactor in order to reduce the working time and increase the production efficiency and product quality. In this study, Bacillus was isolated from soil and grown under flask and bioreactor conditions as biocontrol agent against Botrytis cinerea and Fusarium oxysporum. In this process, a pH value of 7.5, 100% O

Published
2021

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