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Bioactive Constituents of Brazilian Red Propolis

In a new propolis type, red Brazilian propolis, 14 compounds were identified (six of them new for propolis), among them simple phenolics, triterepenoids, isoflavonoids, prenylated benzophenones and a naphthoquinone epoxide (isolated for the first time from a natural source). Three of the major components demonstrated significant antimicrobial activity, and two (obtained as...

Antimicrobial and antioxidant potential of different solvent extracts of the medicinal plant Geum urbanum L.

Many Geum species are known to be rich in biologically active compounds and therefore could be a source of new natural products with pharmacological potential. The medicinal plant Geum urbanum L. is widespread in Bulgaria and has been used in folk medicine. In the present study, the methanol extracts of the roots and aerial parts of G. urbanum and their fractions (petroleum ether...

Propolis volatile compounds: chemical diversity and biological activity: a review

Propolis is a sticky material collected by bees from plants, and used in the hive as building material and defensive substance. It has been popular as a remedy in Europe since ancient times. Nowadays, propolis use in over-the-counter preparations, “bio”-cosmetics and functional foods, etc., increases. Volatile compounds are found in low concentrations in propolis, but their aroma...

Antibacterial Compounds from Propolis of Tetragonula laeviceps and Tetrigona melanoleuca (Hymenoptera: Apidae) from Thailand

This study investigated the chemical composition and antimicrobial activity of propolis collected from two stingless bee species Tetragonula laeviceps and Tetrigona melanoleuca (Hymenoptera: Apidae). Six xanthones, one triterpene and one lignane were isolated from Tetragonula laeviceps propolis. Triterpenes were the main constituents in T. melanoleuca propolis. The ethanol...

Natural products chemistry in the third millennium

The main directions of Natural Products Chemistry in the Third Millennium are summarized.

Omani propolis: chemical profiling, antibacterial activity and new propolis plant sources

Najdenski 1 Vassya Bankova 0 0 Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences , Sofia 1113 , Bulgaria 1 Institute of Microbiology “Stefan Angelov”, Bulgarian

Different extraction methods of biologically active components from propolis: a preliminary study

Bankova 0 0 Address: Institute of Organic Chemistry with the Centre of Phytochemistry, Bulgarian Academy of Sciences , Acad. G. Bonchev str., bl. 9, 1113 Sofia , Bulgaria Background: Propolis is widely

Antibacterial mono- and sesquiterpene esters of benzoic acids from Iranian propolis

Vassya Bankova 0 0 Institute of Organic Chemistry with the Centre of Phytochemistry, Bulgarian Academy of Sciences , Acad G Bonchev str, bl 9, 1113 Sofia , Bulgaria 1 Department of Animal Science, Faculty

GC-MS studies of the chemical composition of two inedible mushrooms of the genus Agaricus

Background Mushrooms in the genus Agaricus have worldwide distribution and include the economically important species A. bisporus. Some Agaricus species are inedible, including A. placomyces and A. pseudopratensis, which are similar in appearance to certain edible species, yet are known to possess unpleasant odours and induce gastrointestinal problems if consumed. We have studied...