María Concepción García-Vallejo

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The chemical composition of waxes was studied in cork planks from three different trees of Spanish Quercus suber at four different stages of the in‐dustrial processing of the first transformation: stripping, first rest, boiling fol‐lowed by open air rest and boiling followed by store-room rest. Waxes were extracted with chloroform (CHCl3) and the extract(More)
The evolution of low molecular weight polyphenols in Spanish oak heartwood of Quercus robur,Quercus petraea, Quercus pyrenaica, and Quercus faginea was studied by HPLC, in relation to the processing of wood in barrel cooperage. The polyphenolic composition of Spanish woods subjected to natural seasoning for 3 years and to the toasting process was studied in(More)
Low molecular weight polyphenols and ellagitannins were analyzed by HPLC, and the molecular weight distribution of ellagitannins was calculated by GPC, in oak heartwood of Quercus robur L., Quercus petraea Liebl., Quercus pyrenaica Wild., and Quercus faginea Lam., grown in Spain, before and after 1 year of seasoning, in Bordeaux, France. During this(More)
The evolution of tannins in Spanish oak heartwood of Quercus robur L., Quercus petraea Liebl.,Quercus pyrenaica Wild., and Quercus faginea Lam. was studied in relation to the processing of wood in barrel cooperage. Their evolution was compared with that of French oak of Q. robur (Limousin, France) and Q. petraea (Allier, France) and American oak of Quercus(More)
There are still no effective means to control Dutch elm disease (DED), caused by the vascular fungi Ophiostoma ulmi and O. novo-ulmi. Plant phenolics may provide a new strategy for DED control, given their known antifungal activity against pathogens and their involvement in plant defence mechanisms. The in vitro antifungal activity of salicylic acid,(More)
Application of endogenous plant hormone salicylic acid (SA) or essential oil component carvacrol (CA) in elms enhances tree resistance to the Dutch elm disease pathogen, although the effect of these compounds on tree metabolism is unknown. The chemical changes induced by SA or CA treatments in Ulmus minor were studied through gas chromatography-mass(More)
The existence of two chemotypes of Pinus pinaster, on the basis of the chemical composition of the resin acids in their needles, is known. An investigation was performed on 54 samples of needles of Spanish Pinus pinaster to study the differences between these chemotypes on the basis of monoterpene, sesquiterpene, neutral diterpene, fatty acid, and resin(More)
Variation of monoterpene, sesquiterpene, neutral diterpene, and fatty and resin acid composition was determined in adult needles of two chemotypes of Pinus pinaster Ait., sampled in two different seasons: summer and winter. Throughout the year, the terpenic and fatty acid composition of adult needles of P. pinaster showed a seasonal variation, both at(More)
A general method is described for the identification of paraffin- and silicone-based surface treatments applied to single-piece natural and 1 + 1 (cork agglomerate with two natural cork disks) cork stoppers used to seal wine bottles. The method is based on Fourier transformed infrared spectroscopy (FTIR) and attenuated total reflectance (ATR) analysis of(More)
Polyphenolic composition (flavonoids and phenolic acids and aldehydes) is studied in the Et2O soluble fractions of the methanolic extracts ofEucalyptus camaldulensis, E. globulus andE. rudis bark. Gallic, protocatechuic, vanillic and ellagic acids, and protocatechuic aldehyde were identified in the three species; eriodictyol, quercetin and naringenin, inE.(More)