The detection of PPi by Cys-CdS QDs decorated with Fe3+
To determine the concentration of PPi using the Cys-CdS QDs
decorated with Fe3+ ([Cys-CdS QDs]-Fe3+) sensor, the following
procedure was performed. Cys-CdS QDs solution (100 lL) and
10 mM Fe3+ stock solution (50 lL) were successively added to a
10.00 mL volumetric flask. The mixture was diluted to approximately
3 quarters of the total volume with 0.1 mM Tris–HCl pH
7.5 and allowed to remain undisturbed for 5 min. Then, the PPi
standard solution was added, and the mixture was further diluted
to a 10 mL volume with 0.1 mM Tris–HCl pH 7.5. The solution was
mixed thoroughly and equilibrated for 5 min prior to recording the
fluorescence spectrum.
Interference study
To evaluate the selectivity of the proposed sensor toward PPi,
the following procedure was performed. An individual stock solution
of various anions (1.0 mM) was prepared by dissolving the anion
salt in deionized water. To a 10 mL volumetric flask, 100 lL of
the Cys-CdS QDs solution and 50 lL of 10 mM Fe3+ were added. The
mixture was diluted to approximately 3 quarters of the total volumetric
flask with 0.1 M Tris–HCl buffer pH 7.5 and maintained at
room temperature for 5 min. Then, each stock solution of the possible
interfering anions was individually added and the mixture
was further diluted to 10 mL with 0.1 mM Tris–HCl pH 7.5. The
solution was equilibrated for 5 min prior to performing spectral
measurements.
The detection of PPi by Cys-CdS QDs decorated with Fe3+
To determine the concentration of PPi using the Cys-CdS QDs
decorated with Fe3+ ([Cys-CdS QDs]-Fe3+) sensor, the following
procedure was performed. Cys-CdS QDs solution (100 lL) and
10 mM Fe3+ stock solution (50 lL) were successively added to a
10.00 mL volumetric flask. The mixture was diluted to approximately
3 quarters of the total volume with 0.1 mM Tris–HCl pH
7.5 and allowed to remain undisturbed for 5 min. Then, the PPi
standard solution was added, and the mixture was further diluted
to a 10 mL volume with 0.1 mM Tris–HCl pH 7.5. The solution was
mixed thoroughly and equilibrated for 5 min prior to recording the
fluorescence spectrum.
Interference study
To evaluate the selectivity of the proposed sensor toward PPi,
the following procedure was performed. An individual stock solution
of various anions (1.0 mM) was prepared by dissolving the anion
salt in deionized water. To a 10 mL volumetric flask, 100 lL of
the Cys-CdS QDs solution and 50 lL of 10 mM Fe3+ were added. The
mixture was diluted to approximately 3 quarters of the total volumetric
flask with 0.1 M Tris–HCl buffer pH 7.5 and maintained at
room temperature for 5 min. Then, each stock solution of the possible
interfering anions was individually added and the mixture
was further diluted to 10 mL with 0.1 mM Tris–HCl pH 7.5. The
solution was equilibrated for 5 min prior to performing spectral
measurements.
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