Biomass-based
carbon nanospheres derived from Mimosa pudica (commonly
called “Touch-me-not”) smeared on carbon
fiber paper have been used as a host matrix for electrochemical deposition
of palladium nanoparticles. The physicochemical characterization of
modified electrodes was performed by field emission scanning electron
microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction
spectroscopy, transmission electron microscopy, and X-ray photoelectron
spectroscopy techniques. Cyclic voltammetry and electrochemical impedance
spectroscopy were used to study the electroanalytical properties of
the electrodes. The modified electrode demostrated an excellent electrocatalytic
activity for the oxidation of a flavonoid, morin, which gave a sensitive
anodic peak at −0.30 V (vs SCE). An ultralow-level detection
limit of 572 fM with a linear dynamic range of 37.50–130 pM
was achieved. The proposed electrochemical sensor was successfully
employed for the analysis of morin in mulberry and guava leaves. This
is a sustainable engineering approach where a perfect unique host
matrix is created using carbon nanospheres from biomass.
Electrodeposited polydopamine (pDA) on a stainless steel substrate was developed for electrochemical sensing of formaldehyde in fish samples. Experimental conditions such as influence of scan rate, pH, and concentration were optimized. The pDA modified electrode was sensitive enough to detect formaldehyde at a potential of 0.8 V in an acidic aqueous solution. The lLinear dynamic range for the detection of formaldehyde was in the range of 0.43 to 1.60 μm under optimal conditions. The detection and quantitation limits were found to be 0.14 and 0.43 μm respectively. The method was effectively employed for the detection of formaldehyde in fish samples.
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