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Transient Expression in Nicotiana Benthamiana Leaves for Triterpene Production at a Preparative Scale
Published on: August 16, 2018
New triterpenoid sulfates from the red alga Tricleocarpa fragilis
F D Horgen1, B Sakamoto, P J Scheuer
1Department of Chemistry, University of Hawaii at Manoa, 2545 The Mall, Honolulu, Hawaii 96822, USA.
Abstract:
Ten new sulfated terpenoids, including six cycloartenol sulfates (1-6), two 29-nor-cycloartenol sulfates (7,8), and two 29-nor-lanosterol sulfates (9,10), were isolated from brine shrimp-toxic fractions of the methanolic extract of the red alga Tricleocarpa fragilis collected in Hawaiian waters. Structures 1-10 were elucidated by spectral methods, and the absolute stereochemistry for compound 1 at C23 was determined by Mosher analysis. Compounds 7 and 10 showed brine shrimp toxicity at 50 microg/mL, while 1 and 3 showed substantial activity at 17 microg/mL. Compounds 2, 4, 5, and 9 were inactive. In cytotoxicity assays, compounds 1-10 were inactive at concentrations tested.
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