Distribution of foliar formylated phloroglucinol derivatives amongst Eucalyptus species
B.M. EschlerA,B, D.M. PassC, R. WillisD, W.J. FoleyA*
ADivision of Botany and Zoology, School of Life Science, Australian National University, Canberra 0200, Australia
BResearch School of Chemistry, Australian National University, Canberra 0200, Australia
CSchool of Biomedical and Molecular Sciences, James Cook University, Townsville, 4811, Australia
DAustralian Institute of Marine Science, Townsville, Australia
Formylated phloroglucinol compounds (FPCs) in Eucalyptus leaves are important determinants of feeding in marsupial folivores and have a wide range of other biological actions. We conducted a survey of the occurrence of formylated phloroglucinol compounds (euglobals, macrocarpals and sideroxylonals) in acetone-petrol extracts of 41 species of Eucalyptus from among seven informal subgenera growing on the East Coast of Australia. We used electrospray ionisation, Fourier transform ion cyclotron resonance mass spectrometry (ESI-FTMS) to search crude extracts of eucalypt leaves for molecular weights characteristic of FPC compounds. We found masses characteristic of reported FPCs in 27 of the 41 species examined. The most frequently identified group of compounds was the sideroxylonals. Notable was the lack of known FPCs in the informal subgenus Monocalyptus.