| Sammanfattning: | Durango, Mexico pine woods have higher resin content than those from southern US. For this reason, a biotechnological study to remove resinic acids and other pitch precursors in pine chips was performed to improve the production of a mechanical pulp mill. Forty nine native strains were isolated and some of them identified as Paecilomyces sp., Penicillum sp., Phialophora sp., Trichosporon sp., Rhodotorula sp., Cryptococcus sp. and Chryseomonas luteola. The later one was the most active in degrading resin components in the flask (87,3 %) and tested in preliminary heap leaching fermentation assays. Paecilomyces sp. was the second most effective (86,6 %) and tested in semisolid fermentation trials. Both solid phase fermentation processes afforded far lower yields compared to the flask experiments.
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