twelve Bulgarian species from genus Senecio. Twenty
of them are new for the corresponding species. Other six
structures reimain tentatively identified.
Key words: Genus Senecio, Pyrrolizidine Alkaloids,
The capillary gas chromatography with mass
spectrometry (GC/MS) is convenient and very
often used method for analysis of a complex mix-
ture containing pyrrolizidine alkaloids (PAs)
(Witte et al., 1993).
As a part of our systematic investigations on the
species from the genus Senecio widespread in Bul-
garia we studied the alkaloid profile of the well
, China). TOM was prepared by the two-step esterification procedure
according to the procedure described by Ramadhas et al. . LOM and SOM were
prepared by NaOH-catalyzed transesterification according to the procedure
described by Jin et al. . The fatty acid compositions of the oils are listed in Tab. 1
according to GC/MCanalysis. Other materials were used without further purification.
Tab. 1. The fatty acid compositions of soybean oil, linseed oil and tung oil.
contributed a lot to MG yield increment compared to oil bath heating. The combined use of IL/NMP and μWIr may be applicable to various biomass conversion processes into useful chemicals. Acknowledgments The authors are very grateful to Dr. Suzuki at Forest Products Research Institute, Toyama Prefectural Agricultural, Forestry and Fisheries Research Center in Japan, for the GC-MCanalysis of the reaction products. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission. Employment or