Flavonoids from Algerian propolis

- The chemical study of propolis collected in the northern-east part of Algeria has been carried out.
- The study afforded five flavones: pectolinarigenin, pilosin, ladanein, Chrysin and Apigenin.
- The structures of the flavones were elucidated by spectroscopic analysis, including mass spectrometry, 1D and 2D NMR.