“…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).…”