Magnetic nanocomposite with fluorescence enhancement effect based on amino acid coated-Fe3O4 functionalized with quantum dots

Sustainable magnetically recoverable Iridium-coated Fe3O4 nanoparticles for enhanced catalytic reduction of organic pollutants in water

“…2 c that as prepared Fe 3 O 4 @trp is negatively charged with a zeta potential value of -24.8 mV. The decrease in negative charge upon functionalization of Fe 3 O 4 nanoparticles with tryptophan amino acid is due to the protonation of free NH 2 groups on the surface of amino acids (Pav et al 2020). The synthesized Fe 3 O 4 @trp@Ir nanocatalyst is positively charged with a zeta potential of +3.02 mV (Fig.…”

“…A feasible option involves the direct functionalization of magnetic nanoparticles with biocompatible molecules such as amino acids (AA) (Tie et al 2006). AA not only possesses active groups for interaction with different biological molecules but also provides colloidal stability to the MNPs (Pav et al 2020). The carboxylic acid functional group of AA can be e ciently grafted on Fe 3 O 4 and nitrogen donor atoms of AA can participate in the coordination to the noble metal centers (Ir, Pt, Ag etc) to produce stable metal complexes for application in catalysis.…”

In Vitro Study: Synthesis and Evaluation of Fe3O4/CQD Magnetic/Fluorescent Nanocomposites for Targeted Drug Delivery, MRI, and Cancer Cell Labeling Applications

“…The hysteresis curve of Fe 3 O 4 /CQDs shows that the presence of CQDs in the nanocomposite reduces M s (48.4 emu/g) compared to pure Fe 3 O 4 (Figure a). Researchers believe that saturation magnetization higher than 32 emu/g is enough to attract a small external magnet . Therefore, the Fe 3 O 4 /CQD nanocomposite is expected to be easily separated from the reaction medium using an external magnet.…”

“…Since 2004, a new type of carbon-based quantum dot called carbon quantum dot (CQD) has been synthesized. The unique properties of carbon nanomaterials such as nanoparticles, fullerenes, carbon nanotubes, graphene sheets, and fluorescent carbon nanoparticles or carbon quantum dots have attracted the attention of many researchers. − Compared to other fluorescent nanomaterials, CQDs have more medical applications due to their unique properties such as neutrality, non-toxicity, easy marking, and rapid and easy synthesis. , Dutta Chowdhury et al developed graphene quantum dots and Fe 3 O 4 nanocomposites combined with a lectin protein, concanavalin A, for cancer cell detection and drug delivery to HeLa cells. They reported that GQD-ConA@Fe 3 O 4 nanocomposites could distinguish HeLa cancer cells from normal endothelial cells.…”

“…The GQD-ConA@Fe 3 O 4 nanocomposite can also transport DOX drug to cancer cells as a drug delivery system. Pavón-Hernández et al modified Fe 3 O 4 nanoparticles with three amino acids l -tryptophan, l -phenylalanine, and l -tyrosine. They reported that the Fe 3 O 4 / l -tryptophan/QDs nanocomposite showed improved fluorescence properties.…”