Matrix-assisted laser desorption/ionization, fast atom bombardment and plasma desorption mass spectrometry of polyethylene glycol esters of (2-benzothiazolon-3-yl)acetic acid.

Fast atom bombardment (FAB), matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) and plasma desorption (PD) mass spectra of newly synthesized polyethylene glycols (PEGs), (M(w) 600-4000 Da) chemically modified with biologically active (2-benzothiazolon-3-yl)acetyl end-groups are described (products 1-6). The spectra were also used for the determination of the molecular mass characteristics (number average (M(n)) and weight average (M(w)) molecular masses) of the initial and modified PEGs. As expected, M(n) and M(w) of the modified samples are higher than those of the non-modified samples.

[Gas-chromatographic-mass-spectral analysis of aroma-compounds of bread (author's transl)].

Analysis of aroma compounds of whithe bread by means of a combined gas-chromatographic-mass-spectral method was carried out. 29 organic compounds were identified, 20 of which were reported for the first time in bread aroma. These for the first time reported compounds are: 1, 1-diethoxyisopentane, 2-phenylethylformiate, n-butylformate, 2-isooctenal, 2-octenone-4, sec.