ON SOME CHARACTERISTICS OF LIGNIN AND POLYPHENOLIC PRODUCTS SEPARATEDFROM SPRUCE BARK

Spruce bark has been subjected to treatments with agents suitable to a lkaline and acid delignification, and with organic solvents, as well a s to successive extractions with petroleum ether, ethylic ether, ethyl ic alcohol, water and alkalies. The products separated have been chara cterizated by elemental analysis, IR spectroscopy and gel permeation c hromatography, on using water or diluted alkaline solutions as elution agents. The obtained data permit to evidence some characteristics to be further employed in subsequent experiments devoted to chemical modi fication or utilization in various domains.