TITLE

UV/Vis spectra and solubility of some naphthoquinones, and the extraction behavior of plumbagin from Plumbago scandens roots in supercritical CO2

AUTHOR(S)
Rodrigues, S. V.; Viana, L. M.; Baumann, W.
PUB. DATE
August 2006
SOURCE
Analytical & Bioanalytical Chemistry;Aug2006, Vol. 385 Issue 5, p895
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The solubility of 1,4-naphthoquinone, plumbagin, lawsone, and juglone in supercritical carbon dioxide was determined spectroscopically at 40°C, and in the pressure range 8–18 MPa. Their solubilities at 12 MPa were between 0.3 and 10 g L−1. Plumbagin from Plumbago scandens L. roots was extracted at 40°C and 20 MPa. The extracted plumbagin mass fraction was up to 0.2% in fresh roots but down to about 0.006% in aged roots. n-Hexane and chloroform extraction of such aged roots indicates that the older and dryer the roots are, the stronger they bind plumbagin. Reversed-phase HPLC indicated a relatively pure plumbagin extract with supercritical carbon dioxide. [Figure not available: see fulltext.]
ACCESSION #
21288207

 

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