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    Multifunctional maca extract coated CuO nanoparticles with antimicrobial and dopamine sensing activities: A dual electrochemical-Smartphone colorimetric detection system
    (Elsevier Science Sa, 2022) Ilgar, Merve; Baytemir, Guelsen; Taşaltın, Nevin; Guelluelue, Selim; Yesilyurt, Ibrahim Saffet; Karakuş, Selcan
    Current trends and future innovative issues focus on the development of smart multifunctional bionanostructures. In this study, novel maca extract-coated CuO nanoparticles (MaE-CuO NPs) were prepared using a green and facile sonication method. Multifunctional MaE-CuO NPs were characterized by different techniques, such as Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), High Resolution Transmission Electron Microscopy (HRTEM), Fourier Transform Infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) techniques. According to the results, we proved that the sonosynthesized MaE-CuO NPs had a uniform spherical shape with an average diameter range of similar to 10 nm, while the surface area was 344.645 m(2)/g. The preservative performance of the antimicrobial MaE-CuO NPs was investigated to evaluate the biological activity of the nanostructure against Staphylococcus aureus (S. aureus), Pseudomonas aeruginosa (P. aeruginosa), Escherichia coli (E. coli), Candida albicans (C. albicans), and Aspergillus brasiliensis (A. brasiliensis). Furthermore, the MaE-CuO NPs-based non-enzymatic electrochemical and smart phone colorimetric biosensor detected dopamine in the concentration range from 0.625 to 5 mu M with a high sensitivity of 667 mu A mu M(-1)cm(-2) and a low limit of detection (LOD) value of 16.9 nM. Consequently, we proved that the obtained nanoformulations are promising antimicrobials agents and colorimetric/electrochemical dual mode biosensors.
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    Preparation and characterization of carboxymethyl cellulose/poly (ethylene glycol) -rosin pentaerythritolester polymeric nanoparticles: Role of intrinsic viscosity and surface morphology
    (Elsevier, 2020) Karakuş, Selcan; Ilgar, Merve; Tan, Ezgi; Kahyaoğlu, İbrahim Mizan; Taşaltın, Nevin; Albayrak, İnci; İnsel, Mert Akın; Kilislioğlu, Ayben
    Polymeric nanoparticles gained importance due to their excellent chemical, physical and biological properties. Herein, novel sonochemical synthesized polymeric nanoparticles were constructed based on carboxymethyl cellulose (CMC)/poly (ethylene glycol) (PEG) polymer blend matrix and rosin pentaerythritolester (RE). Determining the rheology of the novel nanostructure by using dilute solution viscometer (DSV) method was aimed in this paper. This paper was aimed at to determine on the rheology of the novel nanostructure using the dilute solution viscometer (DSV) method.The influence of the temperature, mass ratio, and salt on the intrinsic viscosity of the synthesized CMC/PEG-RE nanoparticles was investigated and its physico-chemical properties were optimized using different mathematical equations such as Huggins, Kraemer, Tanglertpaibul-Rao, Higiro and Rao. The Krigbaum-Wall parameter, Berry number and dimensionless parameter were calculated to understand the degree of miscibility and the synergistic interaction of nanostructures. The Huggins was found to be the most suitable model with the highest correlation constant (R2: 0.94-0.99), and the intrinsic viscosity (22.2-23.4 dl/g). The surface morphology and chemical analysis of the polymeric nanoparticles were evaluated by Fourier-transform infrared spectroscopy (FTIR) and scanning transmission electron microscope (STEM). The results provided a better understanding of RE interactions in CMC/PEG polymer blends and colud be a promising nanocarrier for biomedical applications.