9-Hydroxy-, 9-Acetyloxy-, and 9-Hexanoyloxy Fatty Acids from the Glandular Trichome Exudate of Silene latifolia subsp. alba
Chemical investigation of the glandular trichome exudate from Silene latifolia subsp. alba (Caryophyllaceae) resulted in the identification of 9-hydroxyoctadecanoic acid (1) and five new fatty acids 9-hydroxyicosanoic acid (2), 9-acetyloxyoctadecanoic acid (3), 9-acetyloxyicosanoic acid (4), 9-hexanoyloxyhexadecanoic acid (5) and 9-hexanoyloxyoctadecanoic acid (6). The oxygenated positions in these fatty acid derivatives were determined to be at C-9 by GC-MS analysis of their trimethylsilyl (TMS) derivatives, while the configurations at C-9 of compounds 1 and 2 were established as S by application of the Akasaka-Ohrui method to their methyl esters.
KeywordsSilene latifolia subsp. alba Caryophyllaceae glandular trichome hydroxy-fatty acid 9-acetyloxyoctadecanoic acid 9-hexanoyloxyoctadecanoic acid
The authors thank Ms. Itoh Satsuki, Tokyo Institute of Technology, for the FAB-MS measurement.
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