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fluorometry
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Selective fluorometric determination of sulfadiazine based on the growth of silver nanoparticles on graphene quantum dots
, Article Microchimica Acta ; Volume 187, Issue 1 , 2020 ; Haji Shabani, A. M ; Dadfarnia, S ; Kazemi, E ; Sharif University of Technology
Springer
2020
Abstract
A sensitive fluorometric assay is described for the direct determination of the antibiotic sulfadiazine. Silver nanoparticles placed on graphene quantum dots (Ag NP-GQDs) were synthesized by reduction of AgNO3 with sodium borohydride in the presence of GQDs. The growth of Ag NPs on the surface of the GQDs causes quenching of the blue fluorescence of the GQDs with an emission maximum at 470 nm by surface-enhanced energy transfer. If sulfadiazine is added, it interacts with Ag NPs and fluorescence is restored. Under optimal conditions, the fluorescence increases linearly in the sulfadiazine concentration range of 0.04–22.0 μM. The detection limit is 10 nM with relative standard deviations of...
Expression of functional recombinant human tissue transglutaminase (TG2) using the bac-to-bac baculovirus expression system
, Article Advanced Pharmaceutical Bulletin ; Volume 6, Issue 1 , 2016 , Pages 49-56 ; 22285881 (ISSN) ; Azari, S ; Kalhor, H. R ; Sharif University of Technology
Tabriz University of Medical Sciences
Abstract
Tissue transglutaminase (TG2) is a unique multifunctional enzyme. The enzyme possesses enzymatic activities such as transamidation/crosslinking and non-enzymatic functions such as cell migration and signal transduction. TG2 has been shown to be involved in molecular mechanisms of cancers and several neurodegenerative diseases such as Alzheimer's disease. The present study aimed at cloning and expression of full length human TG2 in Bac-to-Bac baculovirus expression system and evaluation of its activity. Methods: pFastBac HTA donor vector containing coding sequence of human TG2 was constructed. The construct was transformed to DH10Bac for generating recombinant bacmid. The verified bacmid was...