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International Journal on Algae

Erscheint 4 Ausgaben pro Jahr

ISSN Druckformat: 1521-9429

ISSN Online: 1940-4328

SJR: 0.168 SNIP: 0.377 CiteScore™:: 0.6 H-Index: 11

Indexed in

Phycochemistry and bioactivity of ten freshwater algae from Pakistan

Volumen 11, Ausgabe 1, 2009, pp. 84-98
DOI: 10.1615/InterJAlgae.v11.i1.80
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ABSTRAKT

Seven blue-green and three green algae were collected from various freshwater habitats of Sindh (Pakistan) during January 1997 - December 1999 and investigated. Their methanol extracts revealed 17 saturated, 2 monoynoic, 12 monoenoic, 5 di-unsaturated, 5 tri-unsaturated and 6 polyunsaturated fatty acids (FAs), β-sitosterol and trans-phytol, which were identified by GC-MS and NMR spectroscopy. Palmitoleic acid was the most commonly occurring FA, while C15:0, C16:0, C14:1, and C18:1 were the next commonly occurring acids. The unsaturated acids were found in larger proportion (46.50-70.46%) than saturated FAs (16.82-39.20%). The blue-green algae did not differ much from green algae of Pakistan in their FA-compositions. Their methanol extracts exhibited poor antibacterial activity but strong antifungal activities. They showed a significant phytotoxic activity but non-significant cytotoxic and insecticidal activities. The extract of Lyngbya hieronymusii enhanced antitumour activity from 20 to 45% with an increase in the concentration of extract. Algae belonging to three phyla (Cyanophyta, Chlorophyta, and Charophyta) revealed differences in their FA-, sterol- and terpene-compositions as well as their bioactivities.

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