Study of phenolic potential of seasoned and toasted Portuguese wood species (Quercus pyrenaica and Castanea sativa)
<p style="text-align: justify;"><strong>Aim</strong>: The phenolic potential and suitability of seasoned and toasted Portuguese chestnut (<em>Castanea sativa</em> Mill) and oak wood (<em>Quercus pyrenaica</em>) as alternative cooperage materials were evaluated.</p><p style="text-align: justify;"><strong>Methods and results</strong>: Low-molecular-weight phenols and ellagitannins from seasoned and toasted Portuguese wood species were analysed by HPLC. <em>C. sativa</em> was found to be richer in phenolic compounds than <em>Q. pyrenaica</em>. High concentrations of vescalagin and gallic acid were specific to <em>C. sativa</em>. Toasting significantly reduced the ellagitannin content in both wood types, albeit less markedly in <em>C.</em> <em>sativa</em>. As regards phenolic aldehydes, <em>C. sativa</em> contained substantially greater amounts of vanillic aldehyde, an odour-active compound, than <em>Q. pyrenaica</em>.</p><p style="text-align: justify;"><strong>Conclusion</strong>: Both types of Portuguese wood are suitable for use as cooperage materials, although chestnut wood is better suited to the heat treatment involved in the coopering process.</p><p style="text-align: justify;"><strong>Significance and impact of the study</strong>: Portuguese wood species provide an effective alternative to the oak wood species traditionally used for aging alcoholic beverages.</p>