Results 131 to 140 of about 17,968 (192)
Some of the next articles are maybe not open access.
Triterpene und Triterpen-Saponine
1955Triterpene sind Naturstoffe mit 30 C-Atomen. Der Aufbau ihres Molekuls folgt der „Isoprenregel“, d. h. das Kohlenstoffskelet last sich in 6-Isoprenreste zerlegen (s. die Formeln I, III, IV, V). Die Mannigfaltigkeit der Korperklasse wird durch die Abanderungen des Kohlenstoffskelets, durch Zahl und Stellung der Doppelbindungen und der ...
M. Steiner, H. Holtzem
openaire +1 more source
Differential Partitioning of Triterpenes and Triterpene Esters in Apple Peel
Journal of Agricultural and Food Chemistry, 2018Apple peel is a rich source of secondary metabolites, and several studies have outlined the dietary health benefits of ursane-type triterpenes in apple. Changes in triterpene metabolism have also been associated with the development of superficial scald, a postharvest apple peel browning disorder, and postharvest applications of diphenylamine and 1 ...
Brenton C. Poirier +3 more
openaire +2 more sources
Triterpene Biosynthesis in Plants
Annual Review of Plant Biology, 2014The triterpenes are one of the most numerous and diverse groups of plant natural products. They are complex molecules that are, for the most part, beyond the reach of chemical synthesis. Simple triterpenes are components of surface waxes and specialized membranes and may potentially act as signaling molecules, whereas complex glycosylated triterpenes ...
Ramesha Thimmappa +4 more
openaire +2 more sources
A Reinvestigation of Maprounea Triterpenes
Journal of Natural Products, 1995Anti-HIV activity and the inhibition of phorbol ester receptor binding activity in two species of Maprounea were traced to small amounts of highly potent phorbol esters of the daphnane type. The triterpenes previously isolated from this genus were found to be devoid of biological activity when scrupulously purified.
J A, Beutler +8 more
openaire +2 more sources
Triterpenes and triterpene glycosides from Paradrymonia macrophylla
Phytochemistry, 1996Abstract Seven pentacyclic triterpenes and triterpene glycosides have been isolated from the stems and roots of Paradrymonia macrophylla and their structures elucidated by means of 1H and 13C NMR spectroscopy. Three of them are described for the first time as natural products, namely: 2α,3β,19α-trihydroxy-24-oxo-urs-12-en-28-oic acid (24-epi ...
Christian Terreaux +3 more
openaire +1 more source
Triterpenes and triterpene glycosides from the leaves of Ilex rotunda
Phytochemistry, 1993Abstract Two new triterpenes, ilexolic acid A and B, and seven new saponins, ilexosides XXXIII–XXXIX, together with the known saponin rotungenoside were isolated from the fresh leaves of Ilex rotunda , and their structures elucidated on the basis of chemical and physicochemical evidence.
Kayoko Amimoto +2 more
openaire +1 more source
Journal of Pharmaceutical Sciences, 1961
A water extract of the fungus Poria obliqua has been shown to possess tumor-inhibiting activity against two test tumors. Two triterpene alcohols were isolated from the hexane extract, one of which was identified as lanosterol. The second, named obliquol, C30H50O2, was shown to have two hydroxyl groups and two double bonds, one of which is inert to ...
openaire +2 more sources
A water extract of the fungus Poria obliqua has been shown to possess tumor-inhibiting activity against two test tumors. Two triterpene alcohols were isolated from the hexane extract, one of which was identified as lanosterol. The second, named obliquol, C30H50O2, was shown to have two hydroxyl groups and two double bonds, one of which is inert to ...
openaire +2 more sources
2014
Triterpenoids belong to a large and structurally diverse class of natural products which occur abundantly in plant kingdom, especially in higher plants in cases of pentacyclic and tetracyclic triterpenes, while mono-, bi-, and tricyclic triterpenes are prevalent in ferns and nonflowering lower plants (cryptogams).
Sunil Kumar Talapatra, Bani Talapatra
openaire +1 more source
Triterpenoids belong to a large and structurally diverse class of natural products which occur abundantly in plant kingdom, especially in higher plants in cases of pentacyclic and tetracyclic triterpenes, while mono-, bi-, and tricyclic triterpenes are prevalent in ferns and nonflowering lower plants (cryptogams).
Sunil Kumar Talapatra, Bani Talapatra
openaire +1 more source
Triterpenes fromMucuna birdwoodiana
Phytochemistry, 1991Methanolic extracts of the stalks of Mucuna birdwoodiana on acid hydrolysis and subsequent methylation with diazomethane provided four triterpene sapogenols. On the other hand, investigation of glycosides after methylation of the same extract led to the isolation of four triterpene glycosides.
Y, Ding, J, Kinjo, C R, Yang, T, Nohara
openaire +2 more sources
Nature, 1938
THE tetracyclic triterpene alcohol basseol, which readily cyclizes to give β-amyrenol1, which in its turn is related to erythrodiol, gypsogenin and hederagenin2, on dehydrogenation with selenium gives as major product a phenanthrene homologue, m.p. 125° (Found: C, 92.7 ; H, 7.2.
J. H. BEYNON +2 more
openaire +1 more source
THE tetracyclic triterpene alcohol basseol, which readily cyclizes to give β-amyrenol1, which in its turn is related to erythrodiol, gypsogenin and hederagenin2, on dehydrogenation with selenium gives as major product a phenanthrene homologue, m.p. 125° (Found: C, 92.7 ; H, 7.2.
J. H. BEYNON +2 more
openaire +1 more source