Sample

CHEMICAL DETAILS SAMPLE ORIGIN SAMPLE PREP./SIZE PYROL. CONDITIONS TOTAL ION COUNTS

BREWER'S YEAST (Saaahavomyaes oerevieiae) see NBS publications

Natl. Bureau of Standards (SRM 1569), Washington, USA suspension in methanol; 10 yg standard 8.3 X 104

remarks - As in the case of pollen (Spectrum E.13) carbohydrate signals dominate, e.g. at m/z 32, 43, 55, 60, 72, 74, 84, 96, 98, 110, 112, 126, but protein signals are also well represented e.g. at m/z 34, 48, 69, 92, 94,108, 117. It should be realized that some of the carbohydrate signals may be derived from the ribose and deoxyribose moieties of RNA and DNA respectively (see Spectra C.l and C.2). Under the Py-MS conditions employed these classes of compounds fail to produce detectable signals of the more characteristic base moieties (see Part I, Section 3.3). Also signals representing lipid moieties will tend to be underrepresented in these spectra (see Part I, Section 3.5).

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