Studies on the Chemical Constituents of Leaves of Betula Phlatyphylla Suk. and on the Determination of Pesticide Residues in Traditional Chinese Medicines by GC-NCIMS
Part One
Betula platyphylla belongs to Betulaceae and has the effect of antitumor, immunoregulatory and antihechic, ect. 28 Compounds were obtained from the water extract of birch leaves by all kinds of chromatographic methods (silica gel column chromatography, polyamide column chromatography, silica gel column, and preparative TLC, ect). 23 Compounds were identified by means of physic-chemical property and spectral data (NMR, MS, FR, ect) including three new compounds: platyphyllin A (1), neochlo...