Extraction Processes in Isolation of Diterpenes from Coal
a Institute of Geotechnics, Slovak Academy of Sciences, Košice, Slovak Republic, bInstitute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
The paper deals with the extraction of a tetracyclic diterpene from Slovak sub-bituminous coal. The extraction procedures used were Soxhlet, microwave-assisted, low-temperature supercritical fluid and high-temperature supercritical fluid (HSFE). The yield of the diterpene fraction containing 82.5 % of 16?(H)-phyllocladane was used to determine the efficiency of extraction procedures. HSFE seems to be the best though demanding procedure. The yield of the diterpene fraction obtained by Soxhlet and microwave-assisted extraction was 0.386 % and 0.254 %, respectively. Microwave-assisted extraction is much shorter compared with the other ones (min vs. days).
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