ANALYSIS OF TAR FROM WOOD AND BAMBOO CRUDE VINEGARS PYR-GC-MS

摘要

Tar constituents of crude vinegars obtained from bamboo (Phyllostachys pubescens), oak (Quercus serratd) and pine (Pinus densiflord) woods were compared with the model vinegar. These tars were analyzed by gas chromatography (GC) and pyrolysis-gas chromatography-mass spectrometry (Pyr-GC-MS). Pyrolyzates of tars obtained from wood and bamboo vinegars were almost similar to one another and mainly composed of phenolic compounds and aromatic hydrocarbons. A remarkable reduction of phenolic compounds (phenol, o-, p-, and m-cresol, syringol) in the model vinegar and the Pyr-GC-MS results of the tars further revealed that phenolic compounds were mainly responsible for the formation of tar of wood and bamboo crude vinegars. Pyrroles, which may be derived from the primary pyrolyzate of amino acid and/or nitrogen-containing extracts, was also partly involved in the occurrence of the tar during aging period.