Laburnum alpinum

Extracts from the seeds of Laburnum alpinum were first shown to possess anti-H(O) activity by Renkonen,6 and this was confirmed by Morgan and Watkins22 and others.77,471 Although the L. alpinum lec-tin(s) has not been purified, hemagglutination-inhibition studies conducted on seed extracts reveal a specificity towards N,N -diacetylchitobiosyl residues.19,196,471 Human A, H, and neuraminidase-treated human Lea blood-group substances were also extremely good inhibitors of the Laburnum lectin.198,471... 

LABURNUM Laburnum anagyroides, Medikus and Laburnum alpinum (Miller) Bercht et J.Presl., Family Fabaceae, are well-known ornamental trees in the garden. In spring they produce yellow flowers in large hanging racemes and the fruit is a capsule similar to a peapod. 

Constit. of the twigs of Laburnum alpinum and of the bark of Erythrina variegata. Also from Calopogonium mucunoides and Millettia thonningii. Cryst. (Me2CO/hexane or CHClj/EtOAc). Mp 213-214°. Di-Ac Cryst. (MeOH or EtOAc/pet. ether). Mp 135-137° (219°). 

Some natural sources are particularly rich in phenolic compounds of stilbene type. The heartwood of several Pinus spp. contains considerable amounts of pinosylvin. 3,4,3, 4 -Tetrahydroxystilbene (piceatannol) (23, 50) and its 3-methyl ether are significant constituents of the bark of Norway spruce Picea abies) (23, 50 K. Sunnerheim and O. Theander, personal communication). The heartwood of laburnum Laburnum alpinum) is remarkable in its content of stilbenes since it contains up to 4% by dry weight of the 3,4,3, 5 -tetrahydroxystilbene (37). 

Erdtman H, Norin T 1963 Heartwood constituents of Laburnum alpinum Brecht. Prest. Acta Chem Scand 17 1781-1782... 

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