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    PANI: Ni(Leu)2 based non-enzymatic electrochemical dopamine sensor
    (Iop Publishing Ltd, 2023) Yıldız, Dilber Esra; Baytemir, Gülsen; Taşaltın, Nevin; Karakuş, Selcan; Gursu, Gamze; Kose, Dursun Ali
    In this study, metal complexes of Leucine (Leu) and Tryptophan (Trip), namely nickel(Leucine)(2) (Ni(Leu)(2)), zinc(Leucine)(2) (Zn(Leu)(2)), cobalt(Leucine)(2) (Co(Leu)(2)), copper(Leucine)(2) (Cu(Leu)(2)), nickel(Tryptophan)(2) (Ni(Trip)(2)), zinc(Tryptophan)(2) (Zn(Trip)(2)), cobalt(Tryptophan)(2) (Co(Trip)(2)), and copper(Tryptophan)(2) (Cu(Trip)(2)), were synthesized. These complexes were then utilized to fabricate nanocomposites (NCs) based on polyaniline (PANI) through a straightforward sonochemical technique. These NCs were then used to fabricate non-enzymatic electrochemical sensors for detecting dopamine (DOP). The results indicate that the PANI:Ni(Leu)(2) NCs based sensor has a high sensitivity of 28.47 mu A mu M-1 cm(-2) and a low limit of detection (LOD) of 9.24 mu M. Also, the sensor was tested against fructose, glucose, lactose, and maltose. The sensitivities of the sensor against fructose, glucose, and lactose were calculated as 2.90 mu Acm(-2) mM(-1), 2.14 mu Acm(-2) mM(-1), 2.81 mu Acm(-2) mM(-1), respectively. Due to the use of Ni(Leu)(2) composition, the DOP detection sensitivity was higher in PANI:Ni(Leu)(2) NCs which can be explained by an enhanced redox mechanism. Furthermore, PANI:Ni(Leu)(2) sensor is selectively detect DOP. The PANI:Ni(Leu)(2) NCs based sensor is a particularly promising candidate for application in biomedical test kits due to its rapid detection.
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    PANI: silicene nanocomposites based non-enzymatic electrochemical voltammetric sensor for dopamine detection
    (Springer, 2023) Baytemir, Guelsen; Taşaltın, Nevin; Karaca, Bahriye; Karakuş, Selcan; Gursu, Gamze; Baris, Behzad; Yıldız, Dilber Esra
    Selective and sensitive detection of dopamine (DA) is imperative for the diagnosis and management of a wide range of neurological disorders, given its vital role as a critical neurotransmitter in the central nervous system. In this study, a series of non-enzymatic electrochemical voltammetric sensors based on polyaniline (PANI), PANI:Silicene, PANI:Coronene, and PANI:Rubrene nanocomposites (NCs) were developed for the detection of dopamine. The results showed that the PANI:Silicene NCs-based sensor exhibited a highly sensitive response towards DOP, with a sensitivity of 197.84 mu A mu M-1 cm(-2) and the lowest limit of detection (LOD) of 0.0385 mu M. The incorporation of silicene significantly enhanced the sensor's performance in terms of both sensitivity and LOD. These findings demonstrate the potential of PANI-Silicene NC-based sensors for highly sensitive and specific detection of DOP.