Researcher:
Nakhjavani, Sattar Akbar

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Researcher

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Sattar Akbar

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Nakhjavani

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Nakhjavani, Sattar Akbar

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Now showing 1 - 4 of 4
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    Publication
    Electro-conductive silica nanoparticles-incorporated hydrogel based on alginate as a biomimetic scaffold for bone tissue engineering application
    (Taylor and Francis Ltd., 2023) Derakhshankhah, Hossein; Eskandani, Morteza; Vandghanooni, Somayeh; Jaymand, Mehdi; Department of Mechanical Engineering; N/A; Taşoğlu, Savaş; Nakhjavani, Sattar Akbar; Faculty Member; Researcher; Department of Mechanical Engineering; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); College of Engineering; N/A; 291971; N/A
    An innovative electrically conductive hydrogel was fabricated through the incorporation of silica nanoparticles (SiO2 NPs) and poly(aniline-co-dopamine) (PANI-co-PDA) into oxidized alginate (OAlg) as a biomimetic scaffold for bone tissue engineering application. The developed self-healing chemical hydrogel was characterized by FTIR, SEM, TEM, XRD, and TGA. The electrical conductivity and swelling ratio of the hydrogel were obtained as 1.7 × 10−3 S cm−1 and 130%, respectively. Cytocompatibility and cell proliferation potential of the developed scaffold were approved by MTT assay using MG-63 cells. FE-SEM imaging approved the potential of the fabricated scaffold for hydroxyapatite (HA) formation and bioactivity induction through immersing in SBF solution.
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    Publication
    Electrochemiluminescent immunosensor for detection of carcinoembryonic antigen using luminol-coated silver nanoparticles
    (Springer, 2023) Khalilzadeh, Balal; Afsharan, Hadi; Hosseini, Nashmin; Ghahremani, Mohammad Hossein; Carrara, Sandro; Omidi, Yadollah; N/A; Department of Mechanical Engineering; Nakhjavani, Sattar Akbar; Taşoğlu, Savaş; Researcher; Faculty Member; Department of Mechanical Engineering; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); N/A; College of Engineering; N/A; 291971
    Recently, electrochemiluminescent (ECL) immunosensors have received much attention in the field of biomarker detection. Here, a highly enhanced ECL immunosensing platform was designed for ultrasensitive detection of carcinoembryonic antigen (CEA). The surface of the glassy carbon electrode was enhanced by applying functional nanostructures such as thiolated graphene oxide (S-GO) and streptavidin-coated gold nanoparticles (SA-AuNPs). The selectivity and sensitivity of the designed immunosensor were improved by entrapping CEA biomolecules using a sandwich approach. Luminol/silver nanoparticles (Lu-SNPs) were applied as the main core of the signaling probe, which were then coated with streptavidin to provide overloading of the secondary antibody. The highly ECL signal enhancement was obtained due to the presence of horseradish peroxidase (HRP) in the signaling probe, in which the presence of H2O2 further amplified the intensity of the signals. The engineered immunosensor presented excellent sensitivity for CEA detection, with limit of detection (LOD) and linear detection range (LDR) values of 58 fg mL−1 and 0.1 pg mL−1 to 5 pg mL−1 (R2 = 0.9944), respectively. Besides its sensitivity, the fabricated ECL immunosensor presented outstanding selectivity for the detection of CEA in the presence of various similar agents. Additionally, the developed immunosensor showed an appropriate repeatability (RSD 3.8%) and proper stability (2 weeks). Having indicated a robust performance in the real human serum with stated LOD and LDR, the engineered immunosensor can be considered for the detection and monitoring of CEA in the clinic. Graphical Abstract: [Figure not available: see fulltext.].
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    Publication
    Halloysite clay nanotube in regenerative medicine for tissue and wound healing
    (Elsevier, 2022) Same, Saeideh; Samee, Golshan; Navidi, Golnaz; Jahanbani, Yalda; Davaran, Soodabeh; N/A; Nakhjavani, Sattar Akbar; Researcher; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); N/A; N/A
    The vital necessity of effective treatment at damaged tissue or wound site has resulted in emerging tissue en-gineering and regenerative medicine. Tissue engineering has been introduced as an alternative approach for common available therapeutic strategies in the terms of restoring deformed tissue structure and its functionality via the developing of new bio-scaffold. Designed three-dimensional (3D) scaffolds, alone or in combination with bioactive agents, should be able to stimulate and accelerate the development of engineered tissues and provide proper mechanical support during in-vivo implantation and later regeneration process. To cover it up, a series of new bio-structures with higher mechanical strength were designed through the combination of halloysite nanotubes (HNTs) into 3D bio-polymeric networks. HNTs clay mineral with its unique rod-like structure and distinctive chemical surface features, exhibits excellent biocompatibility and biosafety for doping into regen-erative scaffolds to enhance their mechanical stiffness and biological performance. In this paper, the ongoing procedures of bone/cartilage tissue engineering and wound healing strategies focusing on the designing of 3D-HNTs bio-composites and their multi-cellular interactions in-vitro and in-vivo preclinical studies are reviewed. Furthermore, the challenges and prospects of 3D-HNTs and HNTs-based functional bio-devices for regenerative medicine are also discussed.
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    PublicationOpen Access
    3D printed microneedles for point of care biosensing applications
    (Multidisciplinary Digital Publishing Institute (MDPI), 2022) Department of Mechanical Engineering; Sarabi, Misagh Rezapour; Nakhjavani, Sattar Akbar; Taşoğlu, Savaş; Faculty Member; Department of Mechanical Engineering; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); KU Arçelik Research Center for Creative Industries (KUAR) / KU Arçelik Yaratıcı Endüstriler Uygulama ve Araştırma Merkezi (KUAR); Koç Üniversitesi İş Bankası Yapay Zeka Uygulama ve Araştırma Merkezi (KUIS AI)/ Koç University İş Bank Artificial Intelligence Center (KUIS AI); Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 291971
    Microneedles (MNs) are an emerging technology for user-friendly and minimally invasive injection, offering less pain and lower tissue damage in comparison to conventional needles. With their ability to extract body fluids, MNs are among the convenient candidates for developing biosensing setups, where target molecules/biomarkers are detected by the biosensor using the sample collected with the MNs. Herein, we discuss the 3D printing of microneedle arrays (MNAs) toward enabling point-of-care (POC) biosensing applications.