Showing papers by "Siddig Ibrahim Abdelwahab published in 2008"

Anticancer and antimicrobial activities of zerumbone from the rhizomes of Zingiber zerumbut.

Abstract: The aim of this study is to evaluate the anticancer and antimicrobial activities of zerumbone (ZER) from the rhizomes of Zingiber zerumbut. ZER is a crystalline sesquiterpene from the wild ginger, Z. zerumbet. This bioactive component has its unique structure, with a cross-conjugated ketone in an 11-membered ring, as well as remarkable biological activity. Thus, this compound has been isolated from the fresh rhizomes of Z. zerumbet using steam distillation and evaluated for its antimicrobial and anticancer activities. The antimicrobial effects were examined using disc diffusion method and group of microorganism, namely known as Methicilin resistant Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella choleraesuis, Bacillus subtilis, Candida albicans, Aspergillus ochraceaus and Sacchoromyces cerevisiae. However, MTT assay was performed to determine the anti-cancer properties of zerumbone on human cervical cancer cells (HeLa) compared to cisplatin as positive control. Zerumbone has shown a dose dependent (p<0.05) anti-bacterial effect on S. choleraesuis, while no antifungal activity were observed. Zerumbone was also able to exert an antiproliferative effect towards cervical cancer cell line (HeLa) in time-dependent manner (p<0.05) (24, 48 and 72 h). It could be concluded that, zerumbone with its unique chemical structure and versatile pharmacological activities might be a potential primer to develop new curative agents for possible various ailments.

Investigations of antioxidant and antibacterial activities of Typhonium flagelliforme (Lodd.) Blume leaves.

Abstract: The antioxidant and antibacterial activity of different extracts from of Typhonium flagelliforme (L.) Blume leave (family: Araceae) commonly called 'Rodent Tuber' was assessed towards different antioxidant models as well as in selected bacteria. None of the extracts showed significant activity against the selected strains. The only exception is hexane extract (2.0±0.15 mm diameter) against Pseudomonas aeruginosa. The positive control, Streptomycin had shown zone of inhibition of 20±1.5, 20±1.3, 23±1.5 and 23±1.0 mm in Methicillin Resistant Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella choleraesuis and Bacillus subtilis, respectively. All the extracts were subjected to screening for their possible antioxidant activity. Two complementary test systems, namely DPPH free radical scavenging and total phenolic compounds, were used for the analysis. The results showed that the inhibitory activity of Dichloromethane (60.7±3.2%) and Methanol (60.1±2.3%) extracts were comparatively commendable inhibition capacity when compared to the positive control BHT (95.3±1.3%). The total phenolic content of Methanol extracts (5.69±0.15 GAE mg g-1 extract) was superior to all other extracts, followed by dichloromethane and ethyl acetate. Considering all the results collectively T. flagelliforme appears to be a promising plant demonstrating antioxidant activity that requires further investigation.