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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.
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    Ultra-sensitive smartphone assisted-colorimetric and non-enzymatic electrochemical sensor behaviors of zinc doped MnO2 nanocomposite: a comparative study on highly selective sensor design against dopamine, ascorbic acid, gallic acid, and tannic acid
    (Springer Heidelberg, 2023) Tan, Ezgi; Baytemir, Gülsen; Taşaltın, Nevin; Karakuş, Selcan
    Although evolving technology enables the production of sensors with excellent properties, the development of a fast-response, portable, and low-cost sensor is very important for food detection and also for disease diagnosis. Herein, zinc doped manganese oxide nanocomposites (Zn:MnO2 NCs) were designed as smartphone-integrated colorimetric and non-enzymatic electrochemical sensors with high sensitivity and selectivity. According to the Transmission electron microscopy (TEM) results showed that the Zn:MnO2 NCs had a spherical shape with a uniform particle size of less than 10 nm. As one of the most important results, the colorimetric sensing behavior of the Zn:MnO2 NCs was showed excellent fast and selective sensitivity against dopamine, ascorbic acid, gallic acid, and tannic acid among the various bio-analytes such as sugars, amino acids, hormones, and phenolic compounds. The Zn:MnO2 NCs were successfully used as smartphone supported paper based sensor against dopamine, gallic acid, and tannic acid using RGB analysis and with low limit of detection (LOD) values of 2.89, 3.88, and 7.81 mu M, respectively. Moreover, Zn:MnO2 exhibited excellent a non-enzymatic electrochemical sensor performance against ascorbic acid with a low LOD of 239 nM and high sensitivity of 44.73 mu A/cm(2) mM in a concentration range of 0.52-11.35 mM. These findings emphasize that the designed Zn:MnO2 NCs based sensors has a potential as easily applicable and rapid sensor systems against of ascorbic acid, gallic acid, tannic acid and dopamine for real food and blood samples that as a point-of-care detection systems.