Photonics / Fotonik
Permanent URI for this collectionhttps://hdl.handle.net/11147/2590
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Article Citation - WoS: 13Citation - Scopus: 14Synthesis of Albumin Nanoparticles in a Water-Miscible Ionic Liquid System, and Their Applications for Chlorambucil Delivery To Cancer Cells(Elsevier, 2022) Akdoğan, Yaşar; Sözer, Sümeyra Çiğdem; Akyol, Cansu; Başol, Merve; Karakoyun, Çiğdem; Çakan Akdoğan, GülçinSerum albumin has been a preferred protein to generate biodegradable and non-toxic nanoparticles (NPs) for drug delivery applications. Different methods applied for the preparation of serum albumin NPs mostly used organic solvents. Here, we prepared serum albumin NPs in an ionic liquid (IL) system. ILs are considered to be green and designer solvents with unique properties that can replace organic solvents in the synthesis of albumin NPs. Bovine serum albumin (BSA) proteins dissolved in water were transformed into BSA NPs in a water/ Triton™X (TX-100), 1-butanol/1-butyl-3-methylimidazolium trifluoromethanesulfonate (BmimCF3SO3) microemulsion-like system by using a high-speed homogenizer and crosslinker glutaraldehyde. The obtained BSA NPs have been used in drug loading and release studies with a hydrophobic anticancer drug chlorambucil (Chl). Drug loading increased as increasing the ratio of Chl incubated with BSA NPs. Monitoring the drug release by UV–Vis spectroscopy revealed a burst release at first 4 h, but two-thirds of drugs stayed with NPs upon diffusion method. On the other hand, cellular uptake of Chl loaded BSA NPs caused a significant MCF7 breast cancer cell death, whereas free Chl and unloaded BSA NPs did not have a significant effect on the cell viability. Furthermore, in vivo toxicity assessment of BSA NPs obtained in the IL system was conducted in the zebrafish animal model. It showed that zebrafish body is able to eliminate BSA NPs without any toxic side effects and encapsulation of Chl into NPs reduced the toxicity of free Chl. In summary, we showed that BSA NPs with size smaller than 200 nm could be prepared in BmimCF3SO3 mediated system. They can be used for Chl loading (up to 6.9 wt%) with a sustainable release and they induce significant cell death in Chl sensitive cancer cells up to 45% in 24 h. These results indicate that BSA NPs could be prepared alternatively in IL systems and used in drug delivery studies.Article Citation - WoS: 10Citation - Scopus: 12The Effect of Dopa Hydroxyl Groups on Wet Adhesion To Polystyrene Surface: an Experimental and Theoretical Study(Elsevier, 2020) Yıldız, Remziye; Özen, Sercan; Şahin, Hasan; Akdoğan, YaşarMussels wet adhesive performance has been arousing curiosity for a long time. It is found that 3,4-dihydroxyphenylalanine (DOPA) is responsible for adhesive properties of mussels. Despite a large body of research characterizing the interactions DOPA with hydrophilic surfaces, relatively few works have addressed the mechanism of interactions with hydrophobic surfaces. The benzene ring of DOPA is the main attributor to the adhesion on hydrophobic polystyrene (PS) surface. However, here we showed that two hydroxyl groups of catechol have also effects on wet adhesion. We studied wet adhesive properties of DOPA, tyrosine and phenylalanine functionalized PEG polymers, PEG-(N-Boc-L-DOPA)(4), PEG-(N-Boc-L-Tyrosine)(4), PEG-(N-Boc-L-Phenylalanine)(4), on spin labeled PS nanobeads (SL-PS) by electron paramagnetic resonance (EPR) spectroscopy. Surface coverage ratio of SL-PS upon additions of PEG-(N-Boc-L-DOPA)(4), PEG-(N-Boc-L-Tyrosine)(4) and PEG-(N-Boc-L-Phenylalanine)(4) showed that SL-PS was covered with 70%, 50% and 0%, respectively. This showed that spontaneous wet adhesion on PS increases with the number of amino acids hydroxyl groups. This is also supported with the density functional theory (DFT) energy calculations and ab-initio molecular dynamics (AIMD) simulations. In water, interactions between water molecules and hydroxyl groups on the catechol induce catechol adhesion via 7C-7C stacking between the catechol and double styrene rings which were already tilted out with water.