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Olearia paniculata

About one hundred ursanes have been obtained from nature so far. Most important of these is ursolic acid (540), first isolated in 1854 from leaves of Arc-tostaphylos uva-ursi. It is widely distributed in nature and has been mostly obtained from leaves and fruits, but has also been isolated from the bark of certain trees - e.g., Olearia paniculata and Betula pendula (207, 228). As already mentioned, a-amyrin (539) occurs together with 8-amyrin in Manila elemi resin, a-Amyrenone (the ketone corresponding to 539) occurs in the heartwood of Diospyros ebenum (174). ll)8-Hydroxy-a-amyrin has been isolated from black dammar, the resinous exudate of Canarium strictum (198). Other important members are 8-boswellic acid (541) from the oleoresin from Boswellia spp., and asiatic acid (542) first isolated from the leaves of Centella asiatica but also present in dammar resin (109, 228). 11-Oxoasiatic acid is a component of the resin from... [Pg.780]

See other pages where Olearia paniculata is mentioned: [Pg.255]    [Pg.777]    [Pg.171]    [Pg.228]    [Pg.255]    [Pg.777]    [Pg.171]    [Pg.228]   
See also in sourсe #XX -- [ Pg.255 ]

See also in sourсe #XX -- [ Pg.25 , Pg.255 ]

See also in sourсe #XX -- [ Pg.777 , Pg.780 ]

See also in sourсe #XX -- [ Pg.171 ]



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