Bioactive Alkaloids from South American Psychotria and Related Species

In vitro antioxidant activity of alkaloids from southern Brazilian Psychotria: a comparative analysis

Background Monoterpene índole alkaloids (MIAs) comprise a class of secondary metabolites of dual biosynthetic origin, characterized by the presence of an indole and a terpene portion. MIAs are widely studied because of their bioactive properties and pharmacological potential. In this study, major MIAs from native species of Psychotria of southern Brazil were used: P. brachyceras, P. umbellata a...

Absence of alkaloids in Psychotria carthagenensis Jacq. (Rubiaceae).

Psychotria viridis and P. carthagenensis are often discussed in relation to the hallucinogenic beverage Ayahuasca, used for religious, medicinal and social purposes. The significance of including Psychotria species in this beverage has been understood on the basis of substantial amounts of tryptamine alkaloids detected on leaves of both P. viridis and P. carthagenensis. Nevertheless, there is a...

13C-NMR Spectral Data of Alkaloids Isolated from Psychotria Species (Rubiaceae).

The genus Psychotria (Rubiaceae) comprises more than 2000 species, mainly found in tropical and subtropical forests. Several studies have been conducted concerning their chemical compositions, showing that this genus is a potential source of alkaloids. At least 70 indole alkaloids have been identified from this genus so far. This review aimed to compile 13C-NMR data of alkaloids isolated from t...

Monoamine oxidase inhibition by monoterpene indole alkaloids and fractions obtained from Brazilian Southern Psychotria species

1-Cover to Abreviations

The plants of Psychotria ipecacuanha (Brot.) Stokes (Rubiaceae) are perennial subshrubs (20 40 cm), the natural habitat of which is the understory in tropical hot humid forest of Central and South America. The roots of P. ipecacuanha are reddish-brown; consist of twisted fragments of around 15 cm long, no thicker than 6 mm and annulated (fig. 1.1.-A). The best known active principles in this pl...