Rapid measurement and evaluation of the effect of drying conditions on harpagoside content in Harpagophytum procumbens (devil's claw) root
Journal of Agricultural and Food Chemistry
ARC Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch, 7599, South Africa; Department of Food Science, Stellenbosch University, Private Bag X1, Matieland (Stellenbosch), 7602, South Africa; Institute for Plant Analysis, Federal Centre for Breeding Research on Cultivated Plants (BAZ), Neuer Weg 22-23, 06484 Quedlinburg, Germany
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.
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