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[Improvement of synthesis of quercetin and genistein sulfates and identification by HPLC-MS].

OBJECTIVE
To improve synthesis of quercetin and genistein sulfates.


METHODS
Quercetin and genistein were esterified with concentrated sulfuric acid for 3 hours in ice and esterfication was terminated by neutralization with 6N NaOH. Derivatives were identified by HPLC-APCI-MS.


RESULTS
Quercetin and genistein derivatives were only one compound of monosulfate.


CONCLUSION
The improvement of synthesis of quercetin and genistein sulfates is a convenient method for obtaining soluble derivatives of the flavonoids.