Abstract
The macrolide group of antibiotics includes natural members, pro-drugs and semi-synthetic derivatives, thus named because they are composed of a large aglycone ring (from 14 to 16 carbon atoms), to which are attached several sugars. Some of them are amino-sugars, containing a diethylamino, tertiary amine function. A number of antibiotics, including erythromycin, oleandomycin, triacetyl-oleandomycin (troleandomycin), carbomycin, spiramycin, tylosin, rosamicin, azithromycin, clarithromycin, dirithromycin and others, are members of this group. On a comparative basis, erythromycin and oleandomycin are similar, with the same basic 14-carbon lactone ring and side chain sugars. The remaining compounds contain a basic 15- or 16-carbon lactone ring and one or two side-chain sugars. Most of the macrolides are produced by Streptomyces spp bacteria. An exception is rosamicin, which is produced by Micromonospora . Clarithromycin and azithromycin are new semi-synthetic derivatives of erythromycin.
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