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pro vyhledávání: '"N. V. Ul´yanovskii"'
Publikováno v:
Russian Chemical Bulletin. 66:875-881
Natural pentacyclic triterpenes were extracted from birch bark with subcritical solvents. The influence of the solvent nature, temperature, and the number of extraction cycles on the efficiency of the process was studied. Using methanol at 100 °С p