Showing papers by "University of Antananarivo published in 1990"
TL;DR: Several species of red algae known to contain agar or carrageenan are abundant on the southeast and southwest coasts of Madagascar and the agarophyte Gelidium madagascariense, collected in the Fort Dauphin area, has been exported on a small scale to Japan for several years.
Abstract: Several species of red algae known to contain agar or carrageenan are abundant on the southeast and southwest coasts of Madagascar. The agarophyte Gelidium madagascariense, collected in the Fort Dauphin area, has been exported on a small scale to Japan for several years. FT-IR and GLC analysis show that it contains an agar polymer, of which the methylated fraction contains predominantly 6-O-methyl galactose and traces of 4-O-methyl galactose.
8 citations
Journal Article•
TL;DR: In this paper, a fractionation of the methanolic extract of Mussaenda arcuata leaves resulted in the isolation of four flavonoid glycosides and two phenylpropanoid derivatives.
Abstract: Fractionation of the methanolic extract of Mussaenda arcuata leaves resulted in the isolation of four flavonoid glycosides and of two phenylpropanoid derivatives. The flavonoids were identified as astragalin 2, isoquercitrin 3, kaempferol-3-O-beta-D-rutinoside 5 and rutin 6 and the two phenylpropanoid derivatives as melilotoside 4 and dihydromelilotoside 1. This latter compound is a novel natural product. The structures of compounds 1-6 have been elucidated on the basis of their spectral data and of those of their acetyl derivatives.
8 citations