LOW-MOLECULAR-WEIGHT PHENOLIC-COMPOUNDS IN SPANISH OAK WOODS

Low molecular weight phenolics were analyzed by HPLC in oak heartwood of Quercus robur L., Quercus petraea Liebl., Quercus pyrenaica Wild., and Quercus faginea Lam. Data were processed with the STATGRAPHICS pro gram. Gallic, ellagic, vanillic, syringic, and ferulic acids, vanillin , syringaldehyde, coniferaldehyde, sinapaldehyde, aesculetin, and scop oletin were found. Ellagic and gallic acid derivatives were also recog nized according to their hydrolysis products and their UV spectra. Q. robur and Q. petraea differ from the others by the relative concentrat ion of these compounds.