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2 035 460

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IPC

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Application

93033656/04, 1993-06-29

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Actual filing date

1993-06-29

(45)

Published

1995-05-20

(72)

Inventor

Fadeev Boris AlekseevichMutovina Milija Grigor'EvnaBondareva Tamara AleksandrovnaSamsonov Nikolaj EfimovichSokolov Igor' VladimirovichTipisev Anri JakovlevichZhiganov Vjacheslav NikolaevichTregubov Gennadij Vasil'EvichBel'Dy Vladimir PetrovichGunar Vladimir Ivanovich

(73)

Holder

Fadeev Boris AlekseevichMutovina Milija Grigor'EvnaBondareva Tamara AleksandrovnaSamsonov Nikolaj EfimovichSokolov Igor' VladimirovichTipisev Anri JakovlevichZhiganov Vjacheslav NikolaevichTregubov Gennadij Vasil'EvichBel'Dy Vladimir PetrovichGunar Vladimir Ivanovich

METHOD OF QUERCITIN PREPARING Russian patent published in 1995 - IPC

Abstract RU 2035460 C1

FIELD: chemical technology. SUBSTANCE: product: quercitin - 3,5,7, -3, 5, 7, 3′, 4′-pentahydroxyflavone, m. p. is 310-317 C. Reagent 1: larch wood. Reagent 2: aqueous solution of alkaline or alkaline-earth metal m-sulfite or ammonium bisulfite (pH 4-6). Reaction conditions: reagent 1 is treated with reagent 2 at 25-100 C following by separation of spent solution containing quercitin and thermal treatment at 125-145 C. Method provides increase of quercitin purity up to 68.5-69.5% and yield up to 99%. Product is used medicine. EFFECT: improved method and increased yield of quercitin.

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RU 2 035 460 C1

Authors

Fadeev Boris Alekseevich

Mutovina Milija Grigor'Evna

Bondareva Tamara Aleksandrovna

Samsonov Nikolaj Efimovich

Sokolov Igor' Vladimirovich

Tipisev Anri Jakovlevich

Zhiganov Vjacheslav Nikolaevich

Tregubov Gennadij Vasil'Evich

Bel'Dy Vladimir Petrovich

Gunar Vladimir Ivanovich

Dates

1995-05-20—Published

1993-06-29—Filed

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