Electrochemical Behavior of Thiamine on a Self-Assembled Gold Electrode and Its Square-Wave Voltammetric Determination in Pharmaceutical Preparations

Abstract

The electrochemical behavior of thiamine on a self-assembled electrode of L-cysteine (Cys/SAM/Au) has been investigated and Cys/SAM/Au can be used to detect thiamine using square-wave voltammetry (SWV). At pH 11.40 Britton-Robinson buffer, thiamine exhibits a well-defined anodic peak on Cys/SAM/Au. Under the optimized conditions, the anodic peak current of SWV was linear with the content of thiamine in the range of 1.1 × 10 -8 -2.2 × 10 -6 mol/L; the detection limit was 5.5 × 10 -9 mol/L. The method was successfully applied to the determination of thiamine in pharmaceutical preparations.

Redox‐Controlled Photosensitization of Nanocrystalline Titanium Dioxide

“…This process, which is utilized for the electrochemical determination of thiamine, proceeds in aqueous solutions at 290 mV versus Ag/AgCl. [58] Thiamine itself cannot bind to the surface of titanium dioxide, but it requires an anchoring group. TiO 2 shows a strong tendency to bind various cyanoferrate complexes.…”

Oxygen Vacancy‐Engineered PEGylated MoO3−x Nanoparticles with Superior Sulfite Oxidase Mimetic Activity for Vitamin B1 Detection

“…The limit of detection (LOD, S/N = 3) for VB1 was 0.46 µg mL −1 . Despite various analytic techniques have been carried out for the detection of VB1, such as high performance liquid chromatography (HPLC), spectrofluorimetric, and electrochemical methods, the unstable signal, complicated and high cost of operation limit their practical applications. In comparison with the reported procedure by different techniques or nanomaterials in Table S5 in the Supporting Information, the LOD of this work has the same order of magnitude as those for carbon nanotubes (LOD = 0.44 µg mL −1 ) and Au‐GQDs (LOD = 0.16 µg mL −1 ) which possess the most sensitive behavior so far from the literatures.…”

CHAPTER 15. Spectrofluorimetric Analysis of Vitamin B1 in Pharmaceutical Preparations, Bio-fluid and Food Samples

“…A number of analytical methods have been reported for the determination of vitamin B 1 including gravimetric (Vannatta and Harris 1959), adsorptive polarographic assay , adsorptive voltammetric (AboulKasim 2000), cathodic stripping voltammetry (Ciszewski and Wang 1992), ion square wave voltammetric analysis (Jiang and Sun 2007), potentiometric determination (Chang and Wang 2006;Jing et al 2003), electrochemical analysis (Wan et al 2002), thin-layer chromatography (Diaz et al 1993;Ponder et al 2004), gas chromatography (Echols et al 1980;Velisek et al 1986), capillary electrophoresis (Mrestani and Neubert 2000;Su et al 2001), high performance liquid chromatography (Bohrer et al 2004;He et al 2005;Marszalz et al 2005;Sanchez-Machado et al 2004;Tang et al 2006), liquid chromatography (Mancinelli et al 2003;Zafra-Gomez et al 2006), spectrofluorimetric analysis (Feng et al 2004;Ni and Cai 2005;Tabrizi 2006;Zou and Chen 2007), spectrophotometric determination (Ghasemi and Abbasi 2005;Rocha et al 2003;Tian and Zhang 2005), ultraviolet spectrophotometry (Lopez-de-Alba et al 2006;Ozdemir and Dinc 2004).…”