LXXXIII.—The constituents of olive leaves

Abstract

Petroleum (b. p. 35-50') extracted 2.86 per cent. Ether

A New Prenylated Isoflavone and Triterpenoids from Erythrina eriotriocha

“…a pentacyclic triterpene isolated for the first time from the beans of Erythroxylum novogranatense (22), of which another monoacetate, 3-acetoxyerythrodiol [3] and the diacetate, 3,28-diacetoxyerythrodiol [4], are described in the literature (17).…”

Formation of Triterpenoids throughout Olea europaea Fruit Ontogeny

“…The olive tree leaf and olive oil have been known for a long time to contain a variety of sterols and triterpenoids, including erythrodiol, oleanic acid and maslinic acid, which are oxygenated derivatives of b-amyrin [17][18][19]. However, very little attention has been paid so far to sterol and triterpenoid metabolism in developing drupes, mainly because of the low content of these compounds (around 1%) compared to triacylglycerols (TAGs) and the long maturation period of the olive fruit (6-7 months).…”

Two branches of the lupeol synthase gene in the molecular evolution of plant oxidosqualene cyclases

“…However, the sequence comparison among triterpene synthase clones to draw any indications for their product specificities is rather difficult at present because of the limited number of clones available. It is urgently needed to search for more triterpene synthase clones from various plant sources not only from an evolutional but also from a mechanistic point of view.Reflecting its generic name, olive leaves (Olea europaea) accumulate a large amount of oleanolic acid [11], which derives from b-amyrin through three oxidation steps. This high content of oleanolic acid is suggestive of high expression of its biosynthetic genes, and led us to search for b-amyrin synthase cDNA from olive leaves although the actual biosynthetic site of triterpenes in this plant has not been identified.…”

“…Reflecting its generic name, olive leaves (Olea europaea) accumulate a large amount of oleanolic acid [11], which derives from b-amyrin through three oxidation steps. This high content of oleanolic acid is suggestive of high expression of its biosynthetic genes, and led us to search for b-amyrin synthase cDNA from olive leaves although the actual biosynthetic site of triterpenes in this plant has not been identified.…”