The biochemistry and medical significance of the flavonoids.

Anthocyanins and other flavonoids

Flavonoids and their glycosides, including anthocyanins

Xanthones from guttiferae

The structures of over 350 taxane diterpenoids are classified and presented with information on their plant source, yield, melting point, and optical activity. The biotransformations and biosynthesis of the taxoids are also reviewed.

The taxane diterpenoids

Constituents of the yew trees

Novel constituents of Uvaria species

Regioselective esterification of diols and triols with lipases in organic solvents

Isethionic acid (2-hydroxyethanesulfonic acid) was isolated as salts from a methanolic extract ofHypnea musciformis collected in the Indian Ocean and identified by comparison (nuclear magnetic resonance, infrared and mass spectrometry) with an authentic sample. The compound has not previously been reported from plants. Investigations of 13 other species of red algae showed that only some samples of species of the families Gigartinaceae, Hypnaceae and Solieriaceae (all of order Gigartinales) contained isethionates.

Isethionate in certain red algae

Three and a half years ago the Danish International Development Agency agreed to finance a joint research programme between the Chemisay Departments of University of Delhi, India, and Odense University, Denmark. The grant was given as a result of a new policy after which the Agency would finance scientific education projects of potential benefit to a third world country and to a minor extent to Denmark. The title of the project is: "Isolation, structure elucidation and biological activity of potential insecticides from Piper species of importance in agriculture and rural development." The Danish producer of pesticides, Cheminova, Inc., generously agreed to carry out biological testing of plant extracts. Naturally occurring long-chain N-isobutylamides have long been recognized as a class in which insecticidal activity is common. As a specific example one can refer to the investigation of Miyakado et al. (15) for which an amide, pipercide, from black pepper, Piper nigrum, was more toxic against adzuki bean weevils than pellitorine and just as active as the pyrethroids.

http://pac.iupac.org/publications/pac/pdf/1994/pdf/6610x2339.pdf

V. S. Parmar

Papers

Constituents of the yew trees

Novel constituents of Uvaria species

Regioselective esterification of diols and triols with lipases in organic solvents

Isethionate in certain red algae

Some recent isolation studies from potential insecticidal Piper species