Up to date, different analytical methods have been developed for diosgenin determination, mainly including gravimetric method (Morris et al., 1958), densitometric thin-layer chromatography (Brain and Hardman, 1968),gas chromatography (Savikin-Fodulovic et al., 1998),spectrometric methods (Sanchez et al., 1972; Chen et al., 2010), high-performance liquid chromatography (Huang et al., 2008; Zhang et al., 2009), and enzyme-linked immunosorbent assay (Li et al., 2010). Of them, spectrophotometry and HPLC are the two usual methods for diosgenin analysis. HPLC analysis has also been widely employed to quantitatively determine other compounds such as nimesulide (Hanif et al., 2011), levobupivacaine (Liu et al., 2011) and sumatriptan(Sheshala et al., 2012). Microplate-spectrophotometry is different from the previous original single cuvette assay,which introduced a multi-well microplate and was automatically measured with the spectrophotometer. Microplate-spectrophotometry has been widely applied in various aspects such as analysis of lipase activity (Choi et al., 2003a), detection of cytochrome P450-carbon monoxide complexes (Choi et al., 2003b), and determination of carbohydrate by phenol-sulfuric acid (Masuko et al., 2005). To the best of our knowledge, there are no reports regarding diosgenin analysis by microplate-spectrophotometry with perchloric acid as color-developing reagent. Microplate-spectrophotometry is an improvement over the classical spectrophotometric method. It can handle of a large amount of samples at the same time for high-throughout analysis of diosgenin content. Comparison studies on microplatespectrophotometry and HPLC for diosgenin analysis have not been reported either. The purpose of this investigation was to compare the methods of microplatespectrophotometry and HPLC in order to develop a simple, fast and economic method for diosgenin analysis of a large number of samples.
đang được dịch, vui lòng đợi..