Terpenoids. XI.¹ Investigation of Nine Cactus Species. Isolation of Two New Triterpenes, Stellatogenin and Machaeric Acid²

New Triterpenes from Machaerocereus eruca

“…& R. (Cactaceae) . Djerasii and co-workers − discovered that M. eruca contained stellatogenin and betulinic acid in 1955. We now report four new triterpenes ( 1−4 ) and four known triterpenes, morolic acid, queretaroic acid, 27-desoxyphillyrigenin, and treleasegenic acid (3β-hydroxytaraxastan-28,20β-olide) from the acid hydrolysate of a MeOH extract.…”

Amyloid β aggregation inhibitory activity of triterpene saponins from the cactus Stenocereus pruinosus

“…The height of S. pruinosus is up to 8 m, blanches are green with 5-8 ribs, and flowers are infundibuliform 7-10 cm in length growing in the blanch apexes with green-brownish external tepals and white internal tepals which are produced 2 or 3 years after being planted [1,2]. The constituents of cacti have been investigated by Djerassi and co-workers, who reported a lot of triterpenoid sapogenins in an acid-hydrolyzed saponinrich extract from many cacti and one of their works revealed S. pruinosus contained oleanolic acid [3]. Considering those reports, we had been further investigating triterpene sapogenins from many cacti and discovered that S. pruinosus contained erythrodiol, longispinogenin and 3β-hydroxy-11α,12α-epoxyolean-28,13β-olide in addition to oleanolic acid from hydrolysate of MeOH extract of S. pruinosus [4].…”

ESTUDIO FITOQUÍMICO DE Echinopsis peruviana

“…Regarding the alkaloid composition in the Echinopsis peruviana and pachanoi species, there is no substantial evidence to conclude that the alkaloid content in "San Pedro Macho" (E. peruviana) is higher compared to that of "San Pedro Hembra" (E. pachanoi), mainly because the existing studies, so far, have employed species collected from different sources 7,[12][13][14][15][16][17] . As a matter of fact in the field of phytochemistry and stressed out by Trout (2005) 17 , the sources of significant differences in the total alkaloid content as well as in the amount of individual alkaloids present in the cactus rely on the taxonomy of species, growing and harvesting conditions, to mention a few.…”