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  • Küçük Resim
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    An ultrasensitive and disposable electrochemical aptasensor for prostate-specific antigen (PSA) detection in real serum samples
    (Springer Science and Business Media Deutschland GmbH, 2023) Özyurt, Canan; Uludağ, İnci; Sezgintürk, Mustafa Kemal
    In this study, we constructed a disposable indium tin oxide polyethylene terephthalate film (ITO-PET)-based electrochemical aptasensor for analyzing prostate-specific antigen (PSA), one of the most important biomarkers of prostate cancer. Because of their clinical importance, building PSA biosensing systems with high sensitivity and stability is essential. However, it still presents significant difficulties, such as low detection limits. We designed a platform to covalently bind the amino-terminated aptamer by modifying the ITO-PET surface with carboxyethylsilanetriol (CTES) to obtain a self-assembled monolayer (SAM). We also evaluated the potential for use in real human serum samples by investigating the optimal operating conditions and analytical performance characteristics of the developed biosensor. The design we present here exhibits excellent precision, with a limit of detection (LOD) as low as 8.74 fg/mL PSA. The broad linear detection range of the biosensor under optimal conditions was determined as 1.0-1500 fg/mL. The dissociation constant (Kd) for the aptamer was also calculated as 46.28 ± 5.63 nM by evaluating the impedimetric response as a function of PSA concentration. The aptasensor displayed considerable repeatability (1.3% RSD) and reproducibility (7.51% RSD) and good storage stability (98.34% of the initial activity for 8 weeks). Additionally, we demonstrated that the technique we developed was quite efficient in estimating the kinetics of aptamer-analyte interactions by determining the Kd and single-frequency impedance (SFI) data. In conclusion, we proposed a selective and sensitive biosensor with the potential for clinical application and superior performance in real serum samples.
  • Küçük Resim
    Öğe
    Biosensing strategies for diagnosis of prostate specific antigen
    (Elsevier B.V., 2022) Özyurt, Canan; Uludağ, İnci; Sezgintürk, Mustafa Kemal
    Almost from the time of its discovery, the prostate specific antigen (PSA) has been one of the most accurate and most extensively studied indicators of prostate cancer (PC). Because of advancements in biosensing systems and technology, PSA analysis methods have been substantially updated and enhanced as compared to their first instances. With the development of techniques in biosensor technology, the number of PSA biosensors that can be used in the biomedical sector is increasing year by year. Many different recognition elements and transducers have been used in the development of biosensor systems that exhibit high sensitivity, selectivity, and specificity. Here in this review, we provide a current overview of the different approaches to PSA detection.
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    Lab-on-a-chip systems for cancer biomarker diagnosis
    (Elsevier B.V., 2023) Özyurt, Canan; Uludağ, İnci; İnce, Bahar; Sezgintürk, Mustafa Kemal
    Lab-on-a-chip (LOC) or micro total analysis system is one of the microfluidic technologies defined as the adaptation, miniaturization, integration, and automation of analytical laboratory procedures into a single instrument or “chip”. In this article, we review developments over the past five years in the application of LOC biosensors for the detection of different types of cancer. Microfluidics encompasses chemistry and biotechnology skills and has revolutionized healthcare diagnosis. Superior to traditional cell culture or animal models, microfluidic technology has made it possible to reconstruct functional units of organs on chips to study human diseases such as cancer. LOCs have found numerous biomedical applications over the past five years, including integrated bioassays, cell analysis, metabolomics, drug discovery and delivery systems, tissue and organ physiology and disease modeling, and personalized medicine. This review provides an overview of the latest developments in microfluidic-based cancer research, with pros, cons, and prospects.
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    Öğe
    Leptin ve nöropeptit Y analizi için tek kullanımlık biyoalgılama sistemlerinin geliştirilmesi
    (Çanakkale Onsekiz Mart Üniversitesi, 2020) Uludağ, İnci; Sezgintürk, Mustafa Kemal
    Leptin, yağ dokusunda sentezlenen bir peptit hormonudur. Enerji alımını ve harcamalarını dengeleyen bir tür anti-obezite faktörü olarak işlev görür. Yüksek leptin konsantrasyonları doğrudan obezite ile ilişkilidir. Nöropeptit Y (NPY) memeli beynindeki en bol nöropeptitten biridir, nörodejeneratif ve nöroimmün hastalıklarda kandaki seviyeleri değişkenlik göstermektedir. Bu da NPY'nin ilişkili hastalıkların teşhisinde ve hastalığın takibinde potansiyel marker olabileceğini işaret etmektedir. Tez kapsamında yenilikçi immobilizasyon yöntemleri kullanılarak Leptin ve NPY biyobelirteçlerinin tayinine yönelik elektrokimyasal immünosensörler tasarlanmıştır. Geliştirilen biyosensör sistemleri biyobelirteçlerin kesin, spesifik, ekonomik ve pratik analizini sağlamaktadır. Çalışma elektrodu olarak indiyum kalay oksit kaplı polietilen tereftalat (ITO-PET) tabakaları kullanılmıştır. Antikorların kovalent etkileşimler yoluyla immobilizasyonu için ITO-PET tabakaları, iki farklı biyosensör sistemi için sırasıyla siyanojen bromür (CNBr) ve hekzametilen diisosiyanat (HMDC) ile modifiye edilmiştir. Tasarlanan biyosensörlerin her aşaması elektrokimyasal empedans spektroskopisi (EIS) ve siklik voltametri (CV) yöntemleri ile karakterize edilmiştir. Her iki immobilizasyon yöntemi için de kapsamlı şekilde optimizasyon ve karakterizasyon çalışmaları yürütülmüştür.