Document Detail

Rapid measurement and evaluation of the effect of drying conditions on harpagoside content in Harpagophytum procumbens (devil's claw) root.
MedLine Citation:
PMID:  15853393     Owner:  NLM     Status:  MEDLINE    
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-rho-coumaroyl harpagide (8rhoCHG) 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 degrees C, 30% relative humidity) and freeze-dried samples. The best retention of HS was obtained at 50 degrees C when evaluating tunnel drying at dry bulb temperatures of 40, 50, and 60 degrees 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 8rhoCHG 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 8rhoCHG: SEP = 0.048%, r = 0.73).
Elizabeth Joubert; Marena Manley; Brian R Gray; Hartwig Schulz
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  53     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2005 May 
Date Detail:
Created Date:  2005-04-27     Completed Date:  2005-06-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3493-502     Citation Subset:  IM    
ARC Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa.
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MeSH Terms
Desiccation / methods*
Freeze Drying
Glycosides / analysis*
Harpagophytum / chemistry*
Plant Roots / chemistry*
Pyrans / analysis*
Technology, Pharmaceutical
Reg. No./Substance:
0/Glycosides; 0/Pyrans; 19210-12-9/harpagoside

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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