INVESTIGADORES
RETA Mario Roberto
artículos
Título:
Extraction of poly-hydroxy compounds with AOT reverse micelles
Autor/es:
O. WAYMAS; J. SILBER; M. RETA
Revista:
JOURNAL OF PHYSICAL ORGANIC CHEMISTRY
Editorial:
Wiley
Referencias:
Año: 2006 vol. 19 p. 219 - 227
ISSN:
0894-3230
Resumen:
UNCORRECTED PROOFS
ABSTRACT: The partition behavior of shikimic acid, gallic acid, gallotannic acid, rutin and quercetin between
reverse microemulsions of the surfactant bis(2-ethylhexyl) sulfosuccinate (AOT) and aqueous salt solutions of LiCl,
NaCl and KCl at different salt concentrations and pH was studied. Quantification of the extracted analytes was
performed by HPLC on an octadecyl silica column using a methanol?buffer mobile phase at pH 3.0. Clean-up before
injection was not needed because the micellar organic phase was compatible with the HPLC mobile phase. A solvent
gradient was used to elute all compounds and the surfactant in a reasonable time. The extraction from the aqueous
media is fast and reproducible. Different solubilization behavior was observed by changing the salt concentration and
the type of cation in the aqueous phase. By proper selection of the experimental conditions, it is observed that shikimic
acid and gallic acid remain mostly in the aqueous phase, whereas significant amounts of gallotannic acid and rutin are
transferred to the micellar phase in only one contact and quercetin is completely solubilized in this phase. Thus, the
different solubilization behavior that these compounds exhibit in the AOT micellar media can be very useful for
extraction and preconcentration purposes.