High-performance liquid chromatographic method for the quantitative determination of hypoxoside in African potato (Hypoxis hemerocallidea) and in commercial products containing the plant material and/or its extracts
Journal of Agricultural and Food Chemistry
Division of Pharmaceutics, Faculty of Pharmacy, Rhodes University, Grahamstown 6140, South Africa
Hypoxoside is a norlignan diglucoside present in the corms of African potato (Hypoxis hemerocallidea). The latter is used as a popular African traditional medicine for it's nutritional and immune-boosting properties. A reverse phase high-performance liquid chromatography method was developed and validated for the determination of hypoxoside using a mobile phase consisting of acetonitrile:water (20:80, v/v). The method was linear throughout the range of 10-100 μg/mL and provided a high degree of accuracy (100 ± 4%). The recovery of the method was found to be 100 ± 5%, and the precision of the study, % relative standard deviation intraday and interday (over three separate days), was better than 6.15 and 5.64%, respectively. The limits of detection and quantification were calculated to be 0.75 and 3.5 μg/mL, respectively. This method was applied to the analysis and quality control of African potato corms as well as 12 commercially available products. The daily intake of hypoxoside through traditionally prepared African potato decoction was also evaluated. © 2006 American Chemical Society.
alkyne; glucoside; hypoxoside; plant extract; article; chemistry; high performance liquid chromatography; Hypoxis; methodology; reproducibility; sensitivity and specificity; South Africa; Alkynes; Chromatography, High Pressure Liquid; Glucosides; Hypoxis; Plant Extracts; Reproducibility of Results; Sensitivity and Specificity; South Africa; Hypoxis; Hypoxis hemerocallidea; Solanum tuberosum