İşoğlu, İsmail Alper

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Isoglu, I. Alper
Isoglu, Ismail A.
Isoglu, Ismail Alper
İşoğlu, İsmail Alper
Job Title
Doç. Dr.
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alper.isoglu@agu.edu.tr
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04.01. Biyomühendislik
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Current Staff
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24

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901

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Scholarly Output

27

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21

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4

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1

WoS Citation Count

133

Scopus Citation Count

140

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5

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4.93

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JournalCount
Fibers and Polymers3
Polymer Bulletin2
Materials Research Express2
Bio-Medical Materials and Engineering1
Bitlis Eren Üniversitesi Fen Bilimleri Dergisi1
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Scholarly Output Search Results

Now showing 1 - 10 of 27
  • Master Thesis
    Centella Asiatica Ekstraktı İçeren Çift Katmanlı Elektro Eğrilmiş Yara Örtüsü
    (2019) Koç, Nuray; İşoğlu, İsmail Alper
    Elektroeğirme yöntemi ile hazırlanan, ekstra sellülar matrisin doğal yapısını taklit eden inovatif ve biyoaktif yara örtüleri geleneksel yara bakım uygulamalarına alternatif olarak önemli bir ilgi kazanmaktadır. Bu çalışmada, elektroeğirme yöntemi ile kuaterner poli(4-vinil piridin) bir üst katmana, Centella Asiatica (CA) ekstratı içeren poli(D,L-laktik-ko-glikolik asit) (PLGA)/poli(3-hidroksibütirat-ko-3-hidroksi valerat) (PHBV) bir alt katmana sahip çift katmanlı bir yara örtüsü üretilmiştir. Elektroeğrilmiş membranların uniform ve boncuksuz fiber yapıları taramalı elektron mikroskop (SEM) kullanılarak gösterilmiştir. CA ekstraktı içeren PLGA/PHBV membranların ortalama fiber çapları 0,471±0,11 μm olarak hesaplanırken, elektroeğrilmiş poli(Q-VP) membranların ortalama fiber çapları 0,460±0,057 μm olarak bulunmuştur. Kimyasal, termal ve mekanik özellikleri, elektroeğrilmiş membranların absorbsiyon kapasitesi ve ayrıca PLGA/PHBV membranlardan CA ekstraktının kümülatif salımı araştırılmıştır. Elektroeğrilmiş membranlar üzerinde insan fibroblast hücrelerinin önceden belirlenen günler için canlılık, yapışma ve tutunma testleri colorimetric CellTiter 96® AQueous One Solution Cell Proliferation Assay (MTS assay) ve SEM ile gösterilmiştir. Sonuçlar, CA içeren çift katmanlı elektroeğrilmiş yara örtüsünün insan fibroblast hücrelerinin tutunma ve çoğalmasına olanak sağladığını göstermiştir. Bu sebepten, CA ekstraktı içeren çift katmanlı yara örtüsünün yara bakımı uygulamaları için umut verici bir potansiyele sahip olduğu değerlendirilmiştir.
  • Article
    Citation - WoS: 14
    Citation - Scopus: 14
    Preparation of Antibacterial Electrospun Poly(D, L-Lactide-co-Glycolide)/Gelatin Blend Membranes Containing Hypericum Capitatum Var. Capitatum
    (Taylor & Francis As, 2021) Aksit, Nazende Nur; Gurdap, Seda; Isoglu, Sevil Dincer; Isoglu, Ismail Alper
    In this study, we fabricated poly(D, L-lactide-co-glycolide)/gelatin (PLGA/gelatin) membranes containing different amounts of Hypericum capitatum var. capitatum (HCC) extract (1, 5, 7.5, 10 wt%) by electrospinning technique. We investigated chemical, morphological, physical, and mechanical properties as well as in vitro degradation behavior of the electrospun membranes. We also evaluated the antibacterial activity of the electrospun membranes against Escherichia coli and Staphylococcus aureus. Viability, adhesion, and attachment of human fibroblast cells on the electrospun membranes on pre-set days were evaluated by the colorimetric CellTiter 96(R) AQueous One Solution Cell Proliferation Assay (MTS assay), scanning electron microscopy (SEM), and 4',6-Diamidino-2-Phenylindole (DAPI) staining.
  • Master Thesis
    Fabrication and Characterization of Hemostatic Chitosan Gelatin Cryogel Containing Verbascum Thapsus Extract and Investigation of Hemostatic Effect
    (2025) Uzuner, Hacernur; İşoğlu, İsmail Alper
    Kanama, insan yaşamı için en büyük tehditlerden biridir ve travma ölümlerinin yaklaşık %40'ına sebep olur. Farklı polimerlerin kombinasyonundan oluşan yeni ve biyoaktif hemostatik biyomalzemeler son yıllarda büyük ilgi görmeye başlamıştır. Bu çalışmada, Verbascum thapsus özütü içeren hemostatik kitosan/jelatin kriyojel üretilerek, morfolojik, kimyasal ve biyolojik olarak karakterize edilmiştir ve in vitro araştırılmıştır. Kriyojeller özgün gözenekli yapısı, hızlı sıvı absorpsiyonu ve hücre infiltrasyon özellikleri nedeniyle hemostatik uygulamalar için oldukça uygundur. Kitosan ve jelatin fonksiyonel grupları aracılığıyla trombosit yapışmasını ve agregasyonunu artırırken, VT özütünün kullanımı, içeriğindeki bileşenlerle biyoaktivitesi artarak pıhtı oluşumunu hızlandırarak kanama süresini kısaltır. SEM ile 225 ile 478 µm arasındaki ortalama gözenek çaplarına sahip, birbirine bağlı, makro gözenekli yapı gözlemlendi. Kriyojeller %3500'lük yüksek oranlarda şişme gösterdi. V. thapsus içeren kriyojeller, E. coli'ye karşı %89'a ve S. aureus'a karşı %78'e kadar bakteriyel inhibisyon gösterdi. Kriyojellerin hücre canlılığı bir insan fibroblast hücre hattı ile test edildi. Kriyojellerin kan uyumluluğu %1'lik hemoliz oranı ile kanıtlandı. V. thapsus özütünün hemostatik aktivitesi in vitro tam kan pıhtılaşma testi ile araştırıldı. Kitosan/jelatin kriyojellerin kan pıhtılaşma indeksi (BCI), V. thapsus özütü eklenerek 11,9'dan 6,5'e düşürüldü ve pıhtılaşma süresi azaltıldı. V. thapsus özütü içeren kitosan/jelatin kriyojeller, kontrolsüz kanama uygulamaları için büyük hemostatik potansiyel gösterdi.
  • Article
    Citation - WoS: 12
    Citation - Scopus: 13
    Sulfobetaine-Based Homo- and Copolymers by Raft: Cross-Linked Micelles and Aqueous Solution Properties
    (Amer Chemical Soc, 2022) Gurdap, Seda; Bayram, Nazende Nur; Isoglu, Ismail Alper; Isoglu, Sevil Dincer; Dinçer İşoǧlu, Sevil
    In this study, we describe the synthesis and aqueous solution behavior of temperature-sensitive N-(3-sulfopropyl)-N-methacroyloxyethyl-N,N-dimethylammonium betaine (SBMA) homopolymers and core cross-linked micelles (CCMs) with an SBMA shell. Reversible addition- fragmentation chain transfer polymerization has been utilized to synthesize sulfobetaine homopolymers, followed by CCM formation during copoly-merization in the presence of an acid-degradable cross-linker. First, SBMA homopolymers of varying chain lengths were synthesized, and it has been demonstrated that an increase in the chain length and concentration of the homopolymer resulted in an increase in the upper critical solution temperature (UCST). Besides, micelles showed concentration-dependent dual temperature-sensitive behavior with UCST and LCST transitions. Also, homopolymers and CCMs were characterized by FTIR, H-1-NMR, GPC, and TEM. Micelle formation and temperature sensitivity were also investigated by DLS. As a result, stabilized micelles were successfully prepared with the motivation of preventing premature drug release and achieving a pH-and temperature-controlled system. Due to their dual-responsive characteristics, the CCMs show promising potential to be used as smart drug carriers for controlled delivery.
  • Article
    Yara Örtü Malzemesi Olarak Elektroeğrilmiş PCL/PHBV Membranların Hazırlanması ve Karakterizasyonu
    (Bitlis Eren Üniversitesi, 2019) İşoğlu, İsmail Alper
    Bu çalışmada, yara örtü malzemesi olarak polikaprolakton (PCL), poli(3-hidroksibütirik asit-ko-3-hidroksivalerikasit) (PHBV) ve ağırlıkça farklı oranlarda (100:0, 50:50, 75:25, 0:100) PCL/PHBV karışımları, farklı çözücüler(kloroform (CHCl3), 1,1,1,3,3,3-Hexfluoro-2-propanol (HFIP) ve bunların karışımları) kullanılarak elektroeğirmetekniği ile fibroz yapıda membranlar hazırlanmıştır. Tüm elektroeğrilmiş membranlar Fourier DönüşümlüKızılötesi Spektroskopisi (FT-IR), Diferansiyel Taramalı Kalorimetre (DSC) ve Taramalı Elektron Mikroskobu(SEM) ile yapı, morfoloji ve ısıl özellikleri açısından karakterize edilmiştir. Ayrıca, absorbsiyon testi ile sıvı tutmakapasiteleri analiz edilmiştir. Karakterizasyon basamağından sonra, seçilen membranların üzerine insan fibroblasthücreleri ekilmiş, in vitro hücre canlılık ve toksisite, MTT testi ile 24, 48 ve 72. saat için analiz edilmiştir.Membranların üzerine ekilen hücrelerin çoğalması 36, 72 ve 120. saat olmak üzere 3 farklı süre için incelenmiş,sonuçlar SEM ile gösterilmiştir. Elde edilen sonuçlar PCL/PHBV (75:25) karışım ile HFIP çözeltisindeelektroeğrilen membranın yara örtü malzemesi olarak kullanılabileceğini göstermiştir.
  • Article
    A Potential Hemostatic Chitosan/Gelatin Cryogel Impregnated with Verbascum Thapsus Leaf Extract for Noncompressible Hemorrhage Management
    (IOP Publishing Ltd, 2025) Uzuner, Hacernur; Yuruk, Adile; Isoglu, Ismail Alper
    In this study, we prepared a series of chitosan/gelatin (CS/GEL) cryogels containing Verbascum thapsus (V. thapsus) leaf extract and identified a lead formulation for noncompressible hemorrhage (NCH). Cryogels with average pore diameters ranging from 225 to 478 mu m were fabricated through cryogelation at various CS/GEL ratios. C15 was chosen as the base scaffold due to its homogeneous pore distribution, with a pore size coefficient of variation (CV) of approximately 0.22. Extract loading was 1%, 5%, 10%, and 20% w/v. Functional porosity was reported by the relative accessible void index (RAVI). In PBS, the values relative to neat C15 were 1.00, 0.27, 0.20, 0.13, and 0.09 for concentrations of 0%, 1%, 5%, 10%, and 20% w/v, respectively. In citrated blood, the series was 1.00, 0.29, 0.12, 0.14, and 0.09. After loading, equilibrium swelling decreased and the compressive modulus increased, consistent with partial pore filling in a fixed network. The cryogels maintained an interconnected macroporous network and showed swelling from 300% to 3600% in blood and PBS. Antibacterial activity reached 89% inhibition, and cell viability remained above 80%. Hemolysis was low and within acceptance limits. Clotting improved in whole blood as the blood clotting index decreased from 11.9 to 6.5, and the clotting time was approximately 6 min. The 5% w/v group provided the optimal balance of clotting, antibacterial effects, and biocompatibility. This study presents a novel hemostatic CS/GEL cryogel containing V. thapsus leaf extract that holds strong potential for future applications in NCH management.
  • Article
    Citation - WoS: 8
    Citation - Scopus: 8
    RAFT-Mediated Synthesis of Poly( N-(2-Hydroxypropyl)Methacrylamide-b-4-vinylpyridine)by Conventional and Microwave Heating
    (Springer, 2013) Ozdemir, Zeynep; Topuzogullari, Murat; Isoglu, Ismail Alper; Dincer, Sevil
    We report the synthesis of N-(2-hydroxypropyl)methacrylamide (HPMA) macroCTA and HPMA-b-4-Vinylpyridine block copolymers via reversible addition-fragmentation chain transfer (RAFT) reaction. Polymerization was carried out in dimethylformamide (DMF) at 70 A degrees C using 4-Cyano-4(thiobenzoylthio) pentanoic acid as chain transfer agent and AIBN as an initiator. Control over molecular weight and composition was achieved by altering the CTA, monomer and initiator feed ratio. The controlled living character of the polymerization was verified with pseudo-first-order kinetic plots, a linear increase of the molecular weight with conversion, and low polydispersities (PDIs a parts per thousand currency sign 1.2). Effect of microwave heating on the homo- and copolymer formation was investigated and the rates were significantly higher than those observed under conventional heating conditions. These polymerization reactions were in controlled fashion resulting in polymers with low PDIs, too. These polymers have a great potential to be used in developing delivery vehicles and conjugates for further drug or gene delivery applications.
  • Article
    Citation - WoS: 6
    Citation - Scopus: 6
    3-Sulfopropyl Methacrylate Based Cryogels as Potential Tissue Engineering Scaffolds
    (Taylor & Francis Ltd, 2020) Durukan, Adile Yuruk; Isoglu, Ismail Alper
    In this study, we developed cryogels containing 3-sulfopropyl methacrylate (SPMA) and 4-vinyl pyridine (4-VP) as a potential scaffold for tissue engineering applications. Cryogels with varying monomer ratios were synthesised by chemical cross-linking under cryogelation conditions. Effect of initiators and cross-linker amount (0.025-0.15 g MBA; 0.012-0.05 g APS; 2.5-12.5 mu l TEMED) and also freezing temperature (-20 and -80oC) were investigated, and the conditions were optimised according to the morphological structures examined by SEM. The functional groups of the materials were characterised by FT-IR. Compression test and swelling were applied to investigate mechanical properties and water absorption ability, respectively. As a preliminary study, selected materials were tested for cell cytotoxicity with MTT. According to our results, the ionic and biocompatible cryogels prepared in this study possessing a highly porous and interconnective structure with good mechanical characteristics and swelling properties can be suitable as tissue scaffolds for many applications.
  • Article
    Yara Örtü Malzemesi olarak Elektroeğrilmiş PCL/PHBV Membranların Hazırlanması ve Karakterizasyonu
    (2019) Isoglu, Ismail Alper
    Bu çalışmada, yara örtü malzemesi olarak polikaprolakton (PCL), poli(3-hidroksibütirik asit-ko-3-hidroksivalerikasit) (PHBV) ve ağırlıkça farklı oranlarda (100:0, 50:50, 75:25, 0:100) PCL/PHBV karışımları, farklı çözücüler(kloroform (CHCl3), 1,1,1,3,3,3-Hexfluoro-2-propanol (HFIP) ve bunların karışımları) kullanılarak elektroeğirmetekniği ile fibroz yapıda membranlar hazırlanmıştır. Tüm elektroeğrilmiş membranlar Fourier DönüşümlüKızılötesi Spektroskopisi (FT-IR), Diferansiyel Taramalı Kalorimetre (DSC) ve Taramalı Elektron Mikroskobu(SEM) ile yapı, morfoloji ve ısıl özellikleri açısından karakterize edilmiştir. Ayrıca, absorbsiyon testi ile sıvı tutmakapasiteleri analiz edilmiştir. Karakterizasyon basamağından sonra, seçilen membranların üzerine insan fibroblasthücreleri ekilmiş, in vitro hücre canlılık ve toksisite, MTT testi ile 24, 48 ve 72. saat için analiz edilmiştir.Membranların üzerine ekilen hücrelerin çoğalması 36, 72 ve 120. saat olmak üzere 3 farklı süre için incelenmiş,sonuçlar SEM ile gösterilmiştir. Elde edilen sonuçlar PCL/PHBV (75:25) karışım ile HFIP çözeltisindeelektroeğrilen membranın yara örtü malzemesi olarak kullanılabileceğini göstermiştir.
  • Article
    Tuning Mechanical Performance of PCL Scaffolds: Influence of 3D Bioprinting Parameters, Polymer Concentration, and Solvent Selection
    (IOP Publishing Ltd, 2025) Ceylan, Saniye Aylin; Baltacioglu, Mehmet Furkan; Bal, Burak; Bayram, Ferdi Caner; Isoglu, Ismail Alper
    The mechanical performance of three-dimensional (3D) bioprinted scaffolds is susceptible to printing parameters and material formulation. In this study, poly (epsilon-caprolactone) (PCL) scaffolds were fabricated using four different polymer concentrations (10%, 25%, 50%, and 75% w/v) to investigate how these variations, along with process parameters, influence mechanical behavior. Maintaining the structural integrity of bioprinted constructs requires careful optimization of polymer concentration and precise control over parameters such as printing speed, pressure, and infill density. Tensile tests were conducted to evaluate the effects of these variables. Among the tested conditions, a 50% (w/v) concentration allowed for a broader operational window, enabling fabrication across a range of printing speeds and pressures. At a printing speed of 5 mm s-1, PCL-DCM exhibited a Young's modulus of 39.0 MPa, while PCL-CF samples printed at 10 mm s-1 achieved the highest modulus of 32.0 MPa. Notably, when the printing speed was kept constant, applying higher pressures led to an increase in Young's modulus, suggesting that pressure plays a key role in enhancing scaffold stiffness. When comparing the 50% and 75% (w/v) polymer concentrations, the 50% (w/v) formulation stood out by offering both higher elongation and greater stiffness, which makes it particularly suitable for load-bearing applications. These findings provide a quantitative framework for optimizing extrusion-based bioprinting of PCL scaffolds, with implications for customized biomedical implants and regenerative medicine.