| egyptian propolis: 2. chemical composition, antiviral and antimicrobial activities of east nile delta propolis. | three propolis samples from east nile delta, egypt were collected. propolis samples were investigated by gc/ms,103 compounds were identified, 20 being new for propolis. dakahlia propolis was a typical poplar propolis but it contained two new caffeate esters and two new triterpenoids. ismailia propolis was characterized by the presence of new triterpenic acid methyl esters and it did not contain any aromatic acids, esters and flavonoids. sharkia propolis was characterized by the presence of caffe ... | 2002 | 12064745 |