Bayramoğlu, Beste
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Bayramoğlu, B.
Bayramoglu, Beste
Bayramoğlu, B
Bayramoglu, B.
Bayramoglu, B
Bayramoglu, Beste
Bayramoğlu, B
Bayramoglu, B.
Bayramoglu, B
Job Title
Email Address
bestebayramoglu@iyte.edu.tr
Main Affiliation
03.08. Department of Food Engineering
Status
Current Staff
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WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
2
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3GOOD HEALTH AND WELL-BEING
1
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4QUALITY EDUCATION
1
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5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
3
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7AFFORDABLE AND CLEAN ENERGY
3
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8DECENT WORK AND ECONOMIC GROWTH
1
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
4
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
0
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
3
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13CLIMATE ACTION
4
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14LIFE BELOW WATER
0
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15LIFE ON LAND
1
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
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17PARTNERSHIPS FOR THE GOALS
0
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Documents
12
Citations
474
h-index
8
This researcher does not have a WoS ID.
Scholarly Output
13
Articles
8
Views / Downloads
9645/2799
Supervised MSc Theses
3
Supervised PhD Theses
1
WoS Citation Count
75
Scopus Citation Count
80
Patents
0
Projects
5
WoS Citations per Publication
5.77
Scopus Citations per Publication
6.15
Open Access Source
7
Supervised Theses
4
| Journal | Count |
|---|---|
| Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2 |
| Coloration Technology | 1 |
| Biophysical Chemistry | 1 |
| International Journal of Agriculture, Environment and Food Sciences | 1 |
| Journal of Food Engineering | 1 |
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13 results
Scholarly Output Search Results
Now showing 1 - 10 of 13
Article Citation - WoS: 6Citation - Scopus: 6Evaluation of the Extracts of Purple Basil (<i>ocimum Basilicum</I> L.) as Natural Ph-Indicator Dyes Anticipated To Be Utilised in Intelligent Food Packaging-An Optimisation Study(Wiley, 2024) Erez, Elif; Bayramoğlu, Beste; Bayramoglu, BestePurple basil (Ocimum basilicum L.) extract has significant potential as a natural colorimetric pH-indicator material owing to its abundance in anthocyanins. This contribution is the first to optimise the ultrasound-assisted extraction of purple basil by response surface methodology in terms of maximum total monomeric anthocyanin (TMA) content and pH-dependent increase in green intensity (IGI) using a three-level, three-factor Box-Behnken design. The latter was considered as a measure of the pH-indicator ability of the extracts. The independent variables were ethanol concentration, solvent/solid ratio, and extraction time for two types of solvents [aqueous ethanol with 0.1% (v/v) acetic acid (Ac) or hydrochloric acid]. Optimum conditions were determined for single and combined responses. The extracts were further characterised according to total phenolic content (TPC), percentage polymeric colour (PPC), 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) antioxidant, and 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activities. All models explained more than 93% of the variability. The combined response model for the Ac-acidified system gave more favourable optimal conditions [55.25% (v/v) ethanol, 30 mL/g solvent/solid ratio and 39.24 min] regarding lower ethanol consumption and shorter times. Validation experiments verified the model successfully predicted the responses. The corresponding TMA, IGI, PPC, TPC, ABTS, and DPPH values were determined as 4.83 +/- 0.18 mg cyanidin-3-glucoside equivalent, 2.29 +/- 0.05, 68.07 +/- 3.17, 28.79 +/- 1.54 mg gallic acid equivalent, 55.85 +/- 1.71 mg Trolox equivalent, and 16.80 +/- 1.08 mg ascorbic acid equivalent per gram dry weight, respectively.Article Structural Changes in Fasted State Dietary Mixed Micelles Upon Solubilization of Beta-Carotene(2022) Bayramoğlu, BesteIt was aimed to investigate the structural changes taking place in duodenal mixed micelles (MM) at fasted state with the incorporation of fatty acids (FA) and the morphological transformations in these MMs upon solubilization of β-carotene (BCR) through coarse-grained (CG) molecular dynamics (MD) simulations. All simulations were performed with GROMACS 2019 simulation package using the Martini force field. Lauric acid (LA), stearic acid (SA) and linoleic acid (LNA) were used to explore the effects of FA chain length and unsaturation. Micelle swelling was observed with the incorporation of all FAs. The increase in size was in line with increasing FA chain length and unsaturation. MMs incorporating LA and SA were ellipsoidal in shape, while polyunsaturated LNA resulted in a worm-like MM. Upon solubilization of BCRs, swelling was observed only in the MMs with long-chain SA and LNA. No micelle growth was observed in the plain and LA MMs despite their smaller sizes. This was attributed to their low-density hydrophobic cores, which allowed a condensation effect induced by the interactions between BCRs and POPC tails. It is inferred that when the micelle is large enough to solubilize BCRs, whether or not swelling will take place depends on the core density. The increase in micelle size was very small in the MM incorporating LNA compared to that in the MM with SA, which was accompanied by an elliptical-to-cylindrical shape transformation. This was due to the fluid nature of the worm-like LNA micelle, which readily allowed the solubilization of 3 BCRs within its core. By resolving the internal structures of BCR incorporated MMs, this study gives valuable insight into the effects of FA chain length and unsaturation on the solubilization behavior of dietary MMs. The results are expected to give direction to the development of rational design strategies for effective BCR delivery systems.Article Citation - WoS: 23Citation - Scopus: 22Modeling of Polystyrene Under Confinement: Exploring the Limits of Iterative Boltzmann Inversion(American Chemical Society, 2013) Bayramoğlu, Beste; Faller, RolandWe explore the limits of a purely structure based coarse-graining technique, the iterative Boltzmann inversion (IBI), in the coarse-graining of a confined concentrated polystyrene solution. In the first place, some technical considerations and challenges encountered in the course of the optimization process are represented. The concepts of the choice of the initial potentials and the cross-dependency of the interactions as well as the order of optimization are discussed in detail. Furthermore, the transferability of a previously developed CG confined polystyrene solution model, the "parent CG confined model", to different degrees of confinement at constant concentration and temperature is examined. We investigate if a CG force field developed for a confined polymer solution by IBI is sensitive to changes in the degree of localization or arrangement of polymers near the surfaces although the concentration is kept constant. For this purpose, reference atomistic simulations on systems of different confinement levels have been performed. The differences in the structure and dynamics of the chains are addressed. Results are compared with those of an unconfined (bulk) system at the same concentration. The chain dimensions and orientations as a function of the distance from the surfaces are also reported. To the best of our knowledge, this is the first computational study that investigates the structural behavior of polymers in close proximity of the surfaces in a concentrated polymer solution rather than in a melt. Transferability of the parent CG confined model is tested by employing the parent force field in CG simulations of the reference systems. Results indicate that the degree of arrangement of monomers and solvent molecules near the surfaces is an important factor that needs to be paid attention to when considering the application of a CG force field developed by IBI to different degrees of confinement.Publication Kurkumin ve Beta-karotenin İnce Bağırsak Karma Misellerinde Çözünme Mekanizmaları ve Bu Olaya Etki Eden Faktörlerin Moleküler Dinamik Simülasyonlar ile İncelenmesi(2021) Bayramoğlu, Beste; Tunçer, Esra; Özuysal, MustafaBeslenme düzenimiz insan sağlığına faydalı olduğu bilinen karotenoidler, kurkuminoidler, çoklu doymamış yağ asitleri ve yağda çözünen vitaminler gibi pek çok biyoaktif bileşeni içeren gıdalardan oluşmaktadır. Bu gıda bileşenlerinden birçoğunun koroner kalp hastalıkları, diyabet, hipertansiyon ve kanser gibi hastalıkların görülme sıklığını düşürme gibi normal besinsel fonksiyonlarının üzerinde sağlığa faydalı etkiler gösterdiği bilinmektedir. Kurkumin ve ß-karoten, kalp rahatsızlıklarının, çeşitli kanser türlerinin ve göz bozukluklarının önlenmesine yardımcı olan önemli lipofilik biyoaktif maddeler arasındadır. Son zamanlarda bu tür lipofilik bileşenlerin ticari fonksiyonel gıda ve içecek ürünlerinde kullanılmasına yönelik ilgi giderek artmaktadır. Ancak, lipofilik yapıları bu moleküllerin bahsi geçen şekilde kullanımlarını sınırlandırmaktadır. Günümüzde pek çok bilimsel çalışma bu tür bileşenlerin biyoyararlılığını arttırmaya yönelik çeşitli kolloidal taşınım sistemlerinin tasarımı üzerine yönelmiştir. Lipofilik biyoaktiflerin emilimlerinin, on iki parmak bağırsağında (duodenum), içerisinde çözündükleri karma miseller yoluyla gerçekleştiği bilinmektedir. Dolayısıyla, kurkumin ve ß-karotenin biyoerişebilirliklerinin, biyoyararlılıklarını belirleyen kilit aşamalardan bir olduğu söylenebilir. Bu projenin amacı, bu kilit aşamaya dair moleküler düzeydeki mekanizmaların açığa çıkarılması, karma misellerde çözünmeyi etkileyen faktörlerin ve oluşan sistemlerin detaylı yapısal özelliklerinin çok-ölçekli moleküler dinamik (MD) simülasyonlar aracılığıyla incelenmesidir. Çalışmada ele alınan etmenler safra lipitleri konsantrasyonu (açlık ve tokluk koşulları), yağ asitlerinin varlığı ve çeşidi, çözünme sırasında ß-karoten ve kurkuminin birbirleriyle olası etkileşimleri olmuştur. Simülasyonlar açık erişim bir yazılım olan GROMACS simülasyon paketi ile gerçekleştirilmiştir. İnce bağırsak sıvı ortamı için oluşturulan model sistemde safra tuzu olarak kolat; fosfolipit olarak POPC (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine) kullanılmıştır. Yağ asitlerinin kuyruk uzunluğu ve doygunluk derecesinin sürece etkilerinin araştırılması amacıyla, çalışmada laurik asit, stearik asit ve linoleik asit kullanılmıştır. Projede elde edilen sonuçlar, açlık ve tokluk koşullarındaki karma miseller arasındaki yapısal farklılıkları, ß-karoten ve kurkuminin bu misellerde çözünmesinde yağ asidi faktörünün etkilerini ve bu lipofilik bileşenler arasındaki etkileşimin misel boyutuna bağlı olarak gerçekleşebileceğini ortaya koymuştur. Çalışmada edinilen bulguların kurkumin ve ß-karoten içeren etkili kolloidal taşınım sistemlerinin tasarımı çalışmalarına katkısı olacaktır.Master Thesis Structure and Gas Transmission Properties of Surface Modified Food Packaging Materials by Layer-By Assembly(Izmir Institute of Technology, 2019) Koca, Nazan; Bayramoğlu, BesteIn this study, two different LbL coatings of chicken egg white lysozyme (LZ) (0.2 % w/v)-gum arabic (GA) (0.2 % w/v) and lysozyme (LZ) (0.2 % w/v)-iota carrageenan (IC) (0.2 % w/v) were investigated as a potential agent in the fabricaton of surfacemodified food packaging materials with improved gas barrier properties. The effects of solution pH, adsorption time, number of layers, and inclusion of drying step in between deposition steps on multilayer formation were explored for both LbL coatings seperately. Film growth was monitored up to 10 layers by UV-Vis spectrometry and Surface Plasmon Resonance (SPR), which allows for in situ observation of the multilayer formation. The LbL coatings were characterized by AFM (Atomic Force Microscopy) and SEM (Scanning Electron Microscopy). The oxygen and water vapor transmission rates of the coatings (assembled on corona treated polypropylene (PP) films) were also measured. The most successful LbL assembly was obtained at pH 7-7 combination, with 20 minutes adsorption time and with intermediate drying steps for both (LZ-GA and LZ-IC) LbL coatings. For both LbL coating, both the UV-Vis and SPR measurements showed the similar zig-zag trend; i.e. desorption of some of the pre-adsorbed LZ from the interface with the deposition of GA (or IC) on it, probably due to formation of soluble complexes between them. The importance of intermediate drying steps was established by UV-Vis, AFM and gas transmission rate measurements. The absence of intermediate drying caused a reduction in total mass deposited and the gas barrier properties of the coatings.Article Citation - WoS: 1Citation - Scopus: 1Fabrication of Electrospun Polycaprolactone Nanofibrous Mats Loaded With Purple Basil Extract (Ocimum Basilicum L.) as Colorimetric Ph Indicator Films(Springer, 2025) Erez, Elif; Eroglu, Ahmet Emin; Bayramoglu, BesteIntelligent packaging with colorimetric pH indicators revolutionizes traditional food packaging by enabling real-time food quality monitoring. This study used electrospinning to develop pH indicator films from polycaprolactone (PCL) incorporating purple basil extract (PBE). Nanofibrous films containing 0.2% PBE (PCLN_0.2PBE), 0.4% PBE (PCLN_0.4PBE), and 0.6% PBE (PCLN_0.6PBE) were fabricated using different electrospinning conditions. The PCLNs fabricated with a voltage of 20 kV and a flow rate of 1.6 mL/h exhibited the most uniform and bead-free morphology according to scanning electron microscopy. The chemical, thermal, mechanical, and wetting characterization of the films was performed by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermal gravimetric analysis, texture analysis, and contact angle analysis, respectively. Both PCLN_0.4PBE and PCLN_0.6PBE films displayed fast (4-5 s) and clear color transitions (Delta E > 3.5) to successive pH buffers within the range critical for food deterioration, while they exhibited excellent color changes (Delta E > 5) for pH variations of at least two units. The PCLN_0.6 PBE film displayed a Delta E of similar to 5 in only 5 min of exposure to ammonia vapor, whereas PCLN_0.4PBE showed a similar color change for over 15 min. The interaction between the films and acidic and alkaline semi-solid foods was simulated using gelatin gels at pH 2.5 and 11, respectively. Both films displayed significant color transitions (Delta E > similar to 9) within 15 min of contact with the gels, with the response from PCLN_0.6 PBE being more pronounced. The color stability in both films was maintained for up to 14 days at 4 degrees C, offering potential early warnings against food spoilage. PBE release was evaluated against different food simulants. The highest release occurred in 50% ethanol; the films demonstrated resistance to 3% acetic acid. The findings indicate that electrospun PCL films integrated with PBE have a promising potential to serve as colorimetric pH indicators for monitoring the freshness of food products.Article Citation - WoS: 11Citation - Scopus: 12Characterization of the Self-Assembly and Size Dependent Structural Properties of Dietary Mixed Micelles by Molecular Dynamics Simulations(Elsevier Ltd., 2019) Tuncer, Esra; Bayramoğlu, BesteThe bile salts and phospholipids are secreted by the gallbladder to form dietary mixed micelles in which the solvation of poorly absorbed lipophilic drugs and nutraceuticals take place. A comprehensive understanding of the micellization and structure of the mixed micelles are crucial to design effective delivery systems for such substances. In this study, the evolution of the dietary mixed micelle formation under physiologically relevant concentrations and the dependence of structural properties on micelle size were investigated through coarse grained molecular dynamics simulations. The MARTINI force field was used to model cholate and POPC as the representative bile salt and phospholipid, respectively. The micellization behavior was similar under both fasted and fed state concentrations. Total lipids concentration and the micelle size did not affect the internal structure of the micelles. All the micelles were slightly ellipsoidal in shape independent of their size. The extent of deviation from spherical geometry was found to depend on the micellar POPC/cholate ratio. We also found that the surface and core packing density of the micelles increased with micelle size. The former resulted in more perpendicular alignments of cholates with respect to the surface, while the latter resulted in an improved alignment of POPC tails with the radial direction and more uniform core density.Doctoral Thesis Exploring the Factors Modulating the Solubilization of Ss-Carotene in Dietary Mixed Micelles Through Computer Simulations(Izmir Institute of Technology, 2018) Tunçer, Esra; Bayramoğlu, Besteβ-carotene is one of the major carotenoids beneficial to human health in the prevention of a variety of diseases. However, due to its hydrophobic nature, the bioavailability of β-carotene is very low. The solubilization of β-carotene in the duodenal mixed micelles is considered as a key step in their bioavailability. Therefore, understanding the factors and the molecular mechanisms behind their solubilization within the dietary mixed micelles are of great importance. Based on this motivation, the aim of this dissertation was to systematically investigate this phenomenon via extensive coarse-grained molecular dynamics simulations in three steps: (i) the characterization of the self-assembly and structure of the mixed micelles of bile salts and phospholipids at fasted and fed state conditions, (ii) determination of the effects of addition of the fatty acids with different chain lengths and degrees of unsaturation ,(iii) solubilization of different amounts of β-carotene in the selected mixed micelles. As it would be computationally too expensive to equilibrate the systems with full atomistic resolution, the MARTINI force field, which is a well-established model for lipid systems, was used. All the simulations were carried out using the GROMACS simulation package. Validations of results were made by comparison of the micellar properties with experimental data in the literature when available. The knowledge gained by this study provides important information to be utilized in the design of effective nutraceutical delivery systems that optimize the bioaccessibility of β-carotene.Master Thesis Comparison of Dipping and Spraying Methods in Layer-By Deposition of Chitosan and Sodium Caseinate(Izmir Institute of Technology, 2016) Üney, Sinem; Bayramoğlu, BesteIn this thesis; it is aimed to develop a novel, ultra thin, homogeneous edible coating with adequate gas barrier properties by layered deposition of chitosan and sodium caseinate with dipping and spraying methods and compare the coating structures. The parameters considered in this study are pH, adsorption times, number of layers and the types of the top layer. To determine the appropriate conditions, zeta potential and hydrodynamic diameter measurements of chitosan and sodium caseinate were done. After determining the appropriate concentrations and pH values, layer deposition has been initiated. Following the formation of multilayer coating by UV-Vis spectrophotometer, the most suitable combination was determined for the formation of multilayer coating. Multilayered coating characterization was done by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Surface Plasmon Resonance which allows to observe coating formation in-situ. Moreover antimicrobial activity, water vapor permeability and oxygen permeability were also investigated. It has been observed that the multilayer coating structures obtained by dipping and spraying methods have some differences. The formation of multilayer coating has been followed successfully with UV-Vis spectrophotometer; besides information about surface topography and coating thickness is obtained by Atomic Force Microscopy (AFM). The multilayered coatings have no significant effects on oxygen permeability and water vapor permeability; however it has contact antimicrobial effect.Article Citation - WoS: 11Citation - Scopus: 11Molecular Dynamics Simulations of Duodenal Self Assembly in the Presence of Different Fatty Acids(Elsevier, 2022) Tunçer, Esra; Bayramoğlu, BesteA comprehensive understanding of dietary mixed micelle formation in the presence of lipid digestion products is crucial for an effective design of nutraceutical delivery systems. This study aimed to investigate the duodenal self-assembly of bile lipids and fatty acids (FA) with different characteristics via coarse-grained molecular dynamics (MD) simulations. The results show that increase in FA chain length and unsaturation degree lead to micelles with lower/higher fractions of FAs/bile salts (BS), lower core and surface packing densities, decreased ordering of lipid tails, thus more fluid internal structures. Our findings provide molecular insight into the instability of intestinal colloidal structures composed of long unsaturated FAs. We show the correlation between FA unsaturation degree and lipid packing density is a significant factor in determining the intermicellar BS concentrations. Overall, this study advances the knowledge in the field by establishing a more integral relationship between the FA characteristics and micelle structural properties over a wider range of FA types through MD simulations.