| Achoimre: | A chemical analysis was performed to determine the major chemical components of five pinespecies in the municipality of Morelia, Michoacán. The pine species studied were: Pinus leiophylla, P.michoacana var. cornuta, P. montezumae, P. oocarpa and P. teocote. The pH value, ash, ash analysis,extractives, holocellulose, lignin and tannins content was determined for each pine species. The resultswere in the range of 4,0 to 4,4 for pH, 0,3% ash in all species (calcium and potassium in higher concentration),17,9% to 25,4% for soda solubility, 7,6% to 8,2% total extractives, 68,1% to 74,7% for holocellulose,24% to 28,5% for lignin and 0,07% to 0,12% for tannins. Through the applied extraction thewood solubility followed the sequence: water > ciclohexan > aceton > methanol. Analysis of variance ofthe data showed that pH, soda solubility, holocellulose, lignin and tannins did vary among pine species(P < 0,05).
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