This study reports the synthesis and characterization of a novel class of flavonoid acetamide derivatives (FA) of quercetin, apigenin, fisetin, kaempferol, and luteolin.
Blue fluorescent carbon dots are synthesized via a one-step hydrothermal method using rosemary leaves as a carbon source. The obtained carbon dots are characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis, FTIR, and fluorescence spectrometry. The results show that carbon dots gave a maximum emission peak at 422 nm when excited at 332 nm. The average particle diameter of the synthesized spherical carbon dots is found to be 16.13 nm with a 4.6-nm standard deviation. The diameters of the produced carbon dots vary, as is evident from standard deviation heights, resulting in multicolor emission spectra. The fruit storage experiment is carried out by investigating the qualitative antioxidant ability of the produced carbon dots. The results obtained for polyvinyl alcohol–carbon dot–coated samples differ remarkably compared to polyvinyl alcohol–coated samples only. The polyvinyl alcohol–carbon dot composition is used in latent fingerprint detection applications. In analyses made on a glass surface, fingerprints cannot be monitored on the glass surface with the polyvinyl alcohol layer under ultraviolet light, while they are observed on the surface covered with the polyvinyl alcohol–carbon dot composition. Moreover, biological activity against Gram-positive, Gram-negative, and yeast strains are investigated.
A new, simple, sensitive and accurate spectrophotometric method has been developed for the assay of metoprolol tartrate (MPT), which is based on the complexation of drug with copper(II) [Cu(II)] at pH 6.0, using Britton-Robinson buffer solution, to produce a blue adduct. The latter has a maximum absorbance at 675 nm and obeys Beer's law within the concentration range 8.5-70 μg/mL. Regression analysis of the calibration data showed a good correlation coefficient (r = 0.998) with a limit of detection of 5.56 μg/mL. The proposed procedure has been successfully applied to the determination of this drug in its tablets. In addition, the spectral data and stability constant for the binuclear copper(II) complex of MPT (Cu2MPT2Cl2) have been reported.
The
demand for safer design and synthesis of gold nanoparticles
(AuNPs) is on the increase with the ultimate goal of producing clean
nanomaterials for biological applications. We hereby present a rapid,
greener, and photochemical synthesis of gold nanoplates with sizes
ranging from 10 to 200 nm using water-soluble quercetin diphosphate
(QDP) macromolecules. The synthesis was achieved in water without
the use of surfactants, reducing agents, or polymers. The edge length
of the triangular nanoplates ranged from 50 to 1200 nm. Furthermore,
the reduction of methylene blue was used to investigate the catalytic
activity of AuNPs. The catalytic activity of triangular AuNPs was
three times higher than that of the spherical AuNPs based on kinetic
rate constants (
k
). The rate constants were 3.44
× 10
–2
and 1.11 × 10
–2
s
–1
for triangular and spherical AuNPs, respectively.
The X-ray diffraction data of gold nanoplates synthesized by this
method exhibited that the nanocrystals were mainly dominated by (111)
facets which are in agreement to the nanoplates synthesized by using
thermal and chemical approaches. The calculated relative diffraction
peak intensity of (200), (220), and (311) in comparison with (111)
was found to be 0.35, 0.17, and 0.15, respectively, which were lower
than the corresponding standard values (JCPDS 04-0784). For example,
(200)/(111) = 0.35 compared to 0.52 obtained from the standard (JCPDS
04-0784), indicating that the gold nanoplates are dominated by (111)
facets. The calculated lattice from selected area electron diffraction
data of the as-synthesized and after 1 year nanoplates was 4.060 and
4.088 Å, respectively. Our calculations were found to be in agreement
with 4.078 Å for face-centered cubic gold (JCPDS 04-0784) and
literature values of 4.07 Å. The computed QDP–Au complex
demonstrated that the reduction process took place in the B ring of
QDP. This approach contributes immensely to promoting the ideals of
sustainable nanotechnology by eradicating the use of hazardous and
toxic organic solvents.
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