Phycochemistry and bioactivity of Zygnema (Zygnemophyceae) from Sindh [Pakistan]
2004
Ghazala, B. | Shameel, M. (Karachi Univ. (Pakistan). Dept. of Botany) | Choudhary, M.I. | Shahzad, S. | Leghari, S.M.
Three filamentous green algae viz. Zygnema czurdae Randhawa, Z. stellinum (Vaucher) C.A. Agardh and Z. tenue Kutzing were collected from various freshwater bodies of Sindh during January to December 1995. Their methanol extracts revealed the presence of a variety of saturated and unsaturated fatty acids (FAs) by GC-MS and beta-sitosterol by El-MS & 1H- NMR. In Z czurdae one saturated, three monounsaturated and one triunsaturated FAs were detected, in Z. stellinum five saturated and four monounsaturated FAs were found, and Z. tenue contained five saturated, five monounsaturated and one triunsaturated FAs. Palmitic (C16:0) and oleic (C18:1) acids were most commonly present in appreciable quantities (2.57-16.95 & 1.23-6.48 %) in them. Their methanol extracts showed no antibacterial activity but a strong antifungal activity against six of the ten (by agar well diffusion method) and six of the seven tested (by food poisoning method) fungal pathogens. They displayed no bioactivity in brine shrimp bioassay and insecticidal tests. However, they exhibited specific differences among themselves.
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