SAMPLE ORIGIN SAMPLE PREP./SIZE PYROL. CONDITIONS TOTAL ION COUNTS
: see insert in spectrum; stigmasta-5,22-dien-3g-ol; C2gH480; MW = 412
: Sigma Chemical Corp., St. Louis, USA
: solution in methanol; 10 ug
: ferromagnetic tube; T 770°C
remarks - In comparison with cholesterol (Spectrum D.9) the homologous ion series at m/z 54, 68, etc. is now more pronounced, apparently reflecting the unsaturated nature of the aliphatic hydrocarbon side-chain. Also an EI fragment is now observed at m/z 81, probably derived from olefinic pyrolysis fragments, such as the molecular ion species at m/z 96 (compare with ergosterol (Spectrum D.ll)).
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