Pakistan Research Repository

STUDIES REGARDING PHYCOCHEMISTRY AND BIOCTIVITY OF SEVEN BLUE-GREEN AND THREE GREEN FRESHWATER ALGAE OF SINDH

Butt, Naila (2004) STUDIES REGARDING PHYCOCHEMISTRY AND BIOCTIVITY OF SEVEN BLUE-GREEN AND THREE GREEN FRESHWATER ALGAE OF SINDH. PhD thesis, University of Karachi, Karachi.

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Abstract

Ten speices of freshwater algae were collected from different areas in the Sindh province of Pakistan and taxonomically identified. Their methanol extracts were investigated phycochemically as well as from the viewpoint of their bioactivity. Altogether 49 different fatty acids were detected including 17 saturated and 32 unsaturated acids, by GLC and GC-MS techniques. In most of the species unsaturated fatty acids were found in a larger proportion than the saturated acids. I almitoleic algal extracts while pentadecylic, palraitic, myristolic and oleic acids were the next commonly occurring acids. The fatty acid compositions of the investigated spices were found to very from phylum to phylum, order, family to family, genus to genus and species to species β-sitosterol and trans-phytol were isolated from eight algal extracts and chemically elucidated by NMR-spectroscopic techniques. Their occurrence also varied from species to species. Extracts of seven algal species were tested against five Gram positive and six Gram negative bacterial, where bacteria of both the categories behaved similarly and to difference could be found out in their sensitivity. Eight algal extracts were tested against three facultative parasites, six plant highly susceptible against these extracts. The extracts obtained from six species showed 33 to 100% significant phytotoxicity. Extracts of all algae displayed non-significant results in brine-shrimp and insecticidal bioassays. Antitumour activity was shown by the extract of one algal species

Item Type:Thesis (PhD)
Uncontrolled Keywords:green freshwater algae, blue-green algae, algae, fatty acids, aphanothece pallida, aphanothece stagnina, nostoc ellipsosporum, arthrospira platensis, lynghya hieronymusii, lyngbya martensiana, gloeotrichia natans, pithophora oedogonia, niteila flexilis
Subjects:Biological & Medical Sciences (c) > Biological Sciences(c1) > Paleo-botany(c1.9)
ID Code:1339
Deposited By:Mr. Muhammad Asif
Deposited On:27 Jan 2007
Last Modified:04 Oct 2007 21:06

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