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Anal Bioanal Chem. 2006 Jul;385(5):895-900. Epub 2006 May 20.

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

Author information

1
Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Outeiro de São João Batista S/N, 24020-150 Niterói, Brazil. silvana@vm.uff.br

Abstract

The solubility of 1,4-naphthoquinone, plumbagin, lawsone, and juglone in supercritical carbon dioxide was determined spectroscopically at 40 degrees 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 degrees 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.

PMID:
16791570
DOI:
10.1007/s00216-006-0502-6
[Indexed for MEDLINE]

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