Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/39857
Title: Time course of fungal removal of lipophilic extractives from Eucalyptus globulus Labill. wood
Authors: Martínez Iñigo, María José, Gutiérrez Suárez, Ana, Río Andrade, José Carlos del, Martínez Hernández, María Jesús, Martínez Ferrer, Ángel Tomás
Keywords: Pitch
Eucalyptus globulus
Extractives
Sitosterol
Fungi
Issue Date: 2000
Publisher: Elsevier
Abstract: Free and esterified sitosterol, the main lipophilic constituents of eucalypt wood extractives, have been associated with the formation of pitch deposits during manufacturing of environmentally-sound paper pulp from Eucalyptus globulus wood. These, and other lipophilic compounds, were analyzed by gas chromatography–mass spectrometry in the course of wood treatments (up to 7 weeks) with four extractive-degrading fungi in order to optimize biotechnological control of pitch deposition in eucalypt pulp (with moderate loss of wood weight). In contrast to commercialized fungi used in pitch control, which are not able to degrade sitosterol, the fungi investigated in this paper produced a rapid decline of both free and esterified sterols in wood. The degradation rate of steroid hydrocarbons and squalene was moderate, and the amount of steroid ketones (probably formed during oxidative degradation of steroids) and triglycerides increased at different stages of wood treatment. Up to 95% removal of total steroids (including free and esterified sterols, steroid ketones and steroid hydrocarbons) by fungi was obtained at the end of wood treatment under the solid-state fermentation conditions used. The most promising results from the point of view of industrial applicability, however, were obtained after 1–2 weeks of treatment with either Phlebia radiata or Poria subvermispora, which enabled 70% steroid removal with a moderate wood weight loss of 1–4%.
URI: http://hdl.handle.net/10261/39857
ISSN: 0168-1656
Citation: Journal of Biotechnology 84(2): 119–126 (2000)
Appears in Collections:(IRNAS) Artículos
(CIB) Artículos
Files in This Item:
File Description SizeFormat 
2000-MARTINEZ-JB-84-119.pdf173 kBAdobe PDFView/Open
Show full item record
 
CSIC SFX LinksSFX Query

Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.