PJB-2012-277
STUDIES ON THE PHYCOCHEMISTRY AND BIOLOGICAL ACTIVITY OF SPIROGYRA RHIZOIDES (CHLOROPHYCOTA)
M.N. KHALID1* AND MUSTAFA SHAMEEL2
Abstract
The unbranched filaments of a grass green macroalga, Spirogyra rhizoides Randhawa were collected from freshwater habitats at Nai Baran in the Sindh Province of Pakistan and extracted in methanol. The extract revealed the presence of 22 different fatty acids, including 11 saturated and 11 unsaturated acids by GLC and GC-MS. The former acids were slightly larger in proportion (52.48%) than latter ones (47.49%). Margaric (10.33%), parinaric (11.34%) and oleic (12.86%) acids were found in highest proportion, while palmitic acid occurred in small proportion (4.84%). Furthermore, two sterols (isodecortinol & dinosterol), one monoterpene (9-hydroxygeraniol), one sesquiterpene (isoafracinol), one triterpene (30-nor-cyclopterospermone) and a polysaccharide (xylasmacin) were also obtained from the extract by (EI, FAB, FD & HR)-MS and (1H & 13C)-NMR spectroscopic techniques. The extract showed strong antimicrobial activity against 14 bacterial and 20 fungal species, including 7 human-, 5 plant- pathogens and 8 saprophytes.
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