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(searched for: doi:10.1080/22243682.2014.935953)
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Asim Hussain, Hamza Rafeeq, Nadia Afsheen, Zara Jabeen, ,
Published: 8 May 2021
Catalysis Letters, Volume 152, pp 414-437; https://doi.org/10.1007/s10562-021-03647-z

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, Wen Qian, Liyuan Cen, Siwei Shen, Shuo Wang, Shujuan Chen, Shuliang Liu, Aiping Liu, Yong Yang,
Published: 30 April 2021
Journal: Lwt
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Nur Kutlu, , İlyas Deveci, Mustafa Teke
Preparative biochemistry & biotechnology, Volume 50, pp 425-437; https://doi.org/10.1080/10826068.2019.1679175

Abstract:
Electrospun polyvinyl alcohol (PVA)/Chitosan nanofibers were successfully prepared and were used as carriers for the first time in urease immobilization. Also, urease immobilized electrospun PVA/Chitosan nanofibers were applied for the removal of urea from artificial blood serum by recycled reactor. The nanofibers were optimized and synthesized by electrospinning technique according to the operational parameters. The morphology and structure of the nanofibers were characterized by scanning electron microscopy (SEM), attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) and thermogravimetric analysis (TGA). Urease was immobilized on the nanofibers by adsorption and crosslinking methods. According to immobilization results, nanofiber enhanced urease stability properties like thermal stability, pH stability, and reusability. Urease immobilized electrospun PVA/Chitosan nanofiber protected its activity by 85% after 10 uses and 45% after 20 uses. Urea removal rates of artificial blood serum were as follows: 100% at 1st cycle, 95% at 2nd, 3rd and 4th cycles; 85% at the 5th cycle; 76% at the 6th cycle, and 65% at the last three cycles.
IEEE Photonics Journal, Volume 11, pp 1-9; https://doi.org/10.1109/jphot.2019.2930524

Abstract:
We present surface plasmon resonance-based sensor for arsenite [As(III)] detection using Di-iron trioxide hydrate - multi-walled carbon nanotube (Fe 2 H 2 O 4 -MWCNT) nanocomposite as a sensing layer. The enticing traits of Fe 2 H 2 O 4 -MWCNT having high surface to volume ratio and good affinity toward arsenic have proven to enhance As(III) absorption onto the sensing surface and consequently increase the sensitivity of the sensor. When tested with different concentrations of As(III) within the range of 0.2 ppb to 1 ppb, sensitivity value was obtained at 1.756° ppb -1 with Fe 2 H 2 O 4 -MWCNT thickness of 7 nm. The detection limit was achieved at 0.2 ppb which surpassed conventional methods and reported studies on SPR-based sensor for As detection.
, Aleksandar Petrovski, Emilija Gjorgieva, Emil Popovski, Maja Lazarova, Ivan Boev, Perica Paunovic, Anita Grozdanov, Aleksandar Dimitrov, Aliaksan Baidak, et al.
Published: 3 July 2019
Engineering in Life Sciences, Volume 19, pp 617-630; https://doi.org/10.1002/elsc.201900021

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