Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - Scopus: 11Μdacs Platform: a Hybrid Microfluidic Platform Using Magnetic Levitation Technique and Integrating Magnetic, Gravitational, and Drag Forces for Density-Based Rare Cancer Cell Sorting(Elsevier, 2023) Keçili, Seren; Yılmaz, Esra; Özçelik, Özge Solmaz; Anıl İnevi, Müge; Günyüz, Zehra Elif; Yalçın Özuysal, Özden; Özçivici, Engin; Tekin, Hüseyin CumhurCirculating tumor cells (CTCs) are crucial indicators of cancer metastasis. However, their rarity in the bloodstream and the heterogeneity of their surface biomarkers present challenges for their isolation. Here, we developed a hybrid microfluidic platform (microfluidic-based density-associated cell sorting (µDACS) platform) that utilizes density as a biophysical marker to sort cancer cells from the population of white blood cells (WBCs). The platform utilizes the magnetic levitation technique on a microfluidic chip to sort cells based on their specific density ranges, operating under a continuous flow condition. By harnessing magnetic, gravitational, and drag forces, the platform efficiently separates cells. This approach involves a microfluidic chip equipped with a microseparator, which directs cells into top and bottom outlets depending on their levitation heights, which are inversely proportional to their densities. Hence, low-density cancer cells are collected from the top outlet, while high-density WBCs are collected from the bottom outlet. We optimized the sorting efficiency by varying the flow rates, and concentrations of the sorting medium's paramagnetic properties using standard densities of polymeric microspheres. To demonstrate the platform's applicability, we performed hybrid microfluidic sorting on MDA-MB-231 human breast cancer cells and U-937 human monocytes. The results showed efficient sorting of rare cancer cells (≥100 cells/mL) from serum samples, achieving a sorting efficiency of ∼70% at a fast-processing speed of 1 mL h−1. This label-free approach holds promise for rapid and cost-effective CTC sorting, facilitating in-vitro diagnosis and prognosis of cancer. © 2023 The Author(s)Conference Object Citation - WoS: 2Citation - Scopus: 2Portatif ve Düşük Maliyetli Merceksiz Holografik Mikroskop Platformu ile Nanoparçacık Tespiti(IEEE, 2020) Delikoyun, Kerem; Keçili, Seren; Tekin, Hüseyin CumhurIn the biological and medical science, detection of biomolecule at very low concentration (<100 pg/mL) is of great importance and it is extensively used in the diagnosis of diseases, drug response monitoring and cancer research. For biomolecule detection tests, captured biomolecules generate signals (fluorescence, color, etc.), which are analyzed by trained personnel in bulky, high cost and fragile devices. However, for clinical applications, the access to these tests is very difficult at resource-limited settings. Lensless holographic microscopy provides high resolution imaging of samples without the need of expensive and fragile optical elements (mirror, lens, filter, etc.) used in traditional imaging technologies. While this technology offers a robust, portable and low-cost design, it enables fully automated processing of the sample image with digital processing schemes and this can also help eliminate user error. In this study, lensless holographic microscopy platform, which can be used in surface coverage assays for the detection of biomolecules, is proposed. It has been shown that nanoparticles (700-1200 nm) used as labels in surface coverage assays for the detection of biomolecules could be sensed on the platform. Therefore, it is anticipated that biomolecules detection could be realized rapidly and sensitively with this easy-to-use and low-cost imaging platform at the location where the high-level health institutions are not available and even at point-of-care settings.