A novel α-fetoprotein-MIP immunosensor based on AuNPs/PTh modified glass carbon electrode

An electrochemical sensor for the amperometric determination of l -tryptophan (Trp) was fabricated by modifying the carbon paste electrode (CPE) with multi-walled carbon nanotubes (MWCNTs) using drop cast method. 4.0 μL of the dispersion containing 2.0 mg of MWCNTs in 1.0 mL of ethanol was drop cast onto the electrode surface and dried in hot air oven to form a stable layer of MWCNTs. The electro-catalytic activity of the modified electrode towards the oxidation of Trp was thoroughly investigated. The modification with MWCNTs has greatly improved the current sensitivity of CPE for the oxidation of Trp. A very minimal amount of the modifier was required to achieve such a high sensitivity. The field emission scanning electron microscopy (FESEM) images revealed a uniform coverage of the surface of CPE by MWCNTs. Nyquist plots revealed the least charge transfer resistance for the modified electrode. The analytical performance of the modified electrode was examined using amperometry under hydro-dynamic conditions. The two linear dynamic ranges observed for Trp were 0.6–9.0 μM and 10.0–100.0 μM. The amperometric determination of Trp did not suffer any interference from other biomolecules. The detection limit of Trp at modified electrode was (3.30 ± 0.37) × 10 −8  M ( S / N  = 3). The analytical applications of the modified electrode were demonstrated by estimating Trp in the spiked milk and biological fluid such as blood serum. The modified electrode showed good reproducibility, long-term stability and anti-fouling effects.

Multi-walled carbon nanotube modified carbon paste electrode as a sensor for the amperometric detection of L-tryptophan in biological samples.

This review covers developments in ‘Atomic Spectrometry’. It covers atomic emission, absorption, fluorescence and mass spectrometry, but excludes material on speciation and coupled techniques which is included in a separate review. It should be read in conjunction with the other related reviews in the series.1–6 A critical approach to the selection of material has been adopted, with only novel developments in instrumentation, techniques and methodology being included. Developments worthy of note include photochemical and electrochemical methods of vapour generation, single particle analysis using ICP-MS and the development of new methods for direct plasma generation in liquid samples. The use of MC-ICP-MS continues to grow in importance for isotope ratio measurements in fields as diverse as geochronology, nuclear forensics and biomedical research. Laser-based methods are also important in many fields, particularly for direct and stand-off analysis of solid samples.

/pdf/atomic-spectrometry-update-review-of-advances-in-atomic-2hg3owkc1b.pdf

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Facile synthesis of silicon dioxide nanoparticles decorated multi-walled carbon nanotubes with graphitization and carboxylation for electrochemical detection of gallic acid

Electrochemical determination of L-Tryptophan based on a multiwall carbon nanotube/Mg-Al layered double hydroxide modified carbon paste electrode as a sensor

Silicon dioxide nanoparticles modified carbon paste electrode was fabricated and used for electrochemical investigation of tryptophan. Compared with the unmodified electrode, the peak current significantly increased. Experimental conditions for tryptophan determination were optimized. Linear relationship between the peak current and tryptophan concentration was obtained in the range of 1.0 × 10−7−5.0 × 10−6 mol L−1 and 5.0 × 10−6−5.0 × 10−5 mol L−1 with an estimated detection limit of 3.6 × 10−8 mol L−1 (S/N = 3). Tryptophan in pharmaceutical and human serum samples were successfully determined by the proposed method.

Electrochemical determination of tryptophan based on silicon dioxide nanopartilces modified carbon paste electrode

Robust composite aerogel beads with pomegranate-like structure for water-based thermal insulation coating

Laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS)–based strategies applied for the analysis of metal-binding protein in biological samples: an update on recent advances

Thorium(IV) triggers ferroptosis through disrupting iron homeostasis and heme metabolism in the liver following oral ingestion.

Facile Synthesis of Ag Nanoparticles Functionalized Carbon Nanospheres and Application in Direct Electrochemistry of Hemoglobin

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