Rapid measurement and evaluation of the effect of drying conditions on harpagoside content in Harpagophytum procumbens (devil's claw) root
Date
2005
Authors
Joubert E.
Manley M.
Gray B.R.
Schulz H.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The effect of drying conditions on harpagoside (HS) retention, as well as the use of near-infrared spectroscopy (NIRS) for rapid quantification of the iridoids, HS, and 8-ρ-coumaroyl harpagide (8ρCHG) and moisture, in dried Harpagophytum procumbens (devil's claw) root was investigated. HS retention was significantly (P < 0.05) lower in sun-dried samples as compared to tunnel-dried (60 °C, 30% relative humidity) and freeze-dried samples. The best retention of HS was obtained at 50 °C when evaluating tunnel drying at dry bulb temperatures of 40, 50, and 60 °C and 30% relative humidity. NIRS can effectively predict moisture content with a standard error of prediction (SEP) and correlation coefficient (r) of 0.24% and 0.99, respectively. The HS and 8ρCHG NIRS calibration models established for both iridoid glucosides can be used for screening purposes to get a semiquantitative classification of devil's claw roots (for HS: SEP = 0.236%, r = 0.64; for 8ρCHG: SEP = 0.048%, r = 0.73). © 2005 American Chemical Society.
Description
Keywords
glycoside, harpagoside, pyran derivative, article, chemistry, comparative study, desiccation, freeze drying, Harpagophytum, methodology, pharmaceutics, plant root, sunlight, temperature, Desiccation, Freeze Drying, Glycosides, Harpagophytum, Plant Roots, Pyrans, Sunlight, Technology, Pharmaceutical, Temperature, Harpagophytum, Harpagophytum procumbens
Citation
Journal of Agricultural and Food Chemistry
53
9
53
9