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Jagessar R C and Hope S
University of Guyana, Guyana
Scientific Tracks Abstracts: J Develop Drugs
The search for alternative complementary natural medicines to replace synthetic antibiotics is on the increase, considering the side effects produced by synthetic drugs, some of which are irreversible. The aqueous extract of leaves of Phyllanthus acidus, Sphagneticola trilobata and Doliocarpus dentatusâ�?�?s bark, uncombined and combined in the absence and presence of Zn2+ were tested against selective pathogenic microorganism such as S. aureus, E.coli., K. pneumoniae, P. aeruginosa and C. albicans using the Disc Diffusion Assay. The area of zone of inhibition, Azoi was taken as an indicator of the plant extractâ�?�?s antimicrobial potency. The highest Azoi of 165.05 mm2 was induced by P. acidus extract against E. coli. In the absence of Zn2+ , zero Azoi was observed for the combined extract of P. acidus + S. Trilobata, S. trilobata + D. dentatus and P. acidus + D. dentatus against S. aureus and K. pneumoniae. The combined plant extract, without Zn2+, seems to induce a higher Azoi against E. coli, K, pneumoniae, C. albicans and P. aeruginosa in comparison with the individual plant extract. As an example, the combined plant extract of S. trilobata and D. dentatus induces Azoi of 122.66 mm2, whereas S. trilobata induces AzoI of 117.79 mm2. For the combined plant extract with Zn2+, a lower Azoi was induced, compared with the individual plant extract. Selective antimicrobial activity was observed for the uncombined and combined extracts, with and without Zn2+ against some of the pathogens. For example, P. acidus aqueous extract showed Azoi of 165.1 mm2 against E. coli, whereas S. trilobata showed Azoi of 67.17 mm2 against E. coli i.e., a selectivity ratio of 2.5 vs. E.coli with respect to the above two extracts.
Raymond C. Jagessar obtained his BSc (Distinction) in Chemistry/Biology from the University of Guyana (1992) and his PhD from the UK (1995). He held three Post Doctoral Research Fellowships at the University of South Carolina (USA), Wichita State University (USA) and the University of the West Indies (1996-1999). He has also won several international awards, amongst them are Chartered Chemist, CChem and Fellow of the Royal Society of Chemistry, FRSC, UK. His research interests are broad, covering the spectrum of Pure and Applied Chemistry, Chemical Biology, Pharmaceutical and Medicinal Chemistry. He has published over seventy (70) research articles, five book chapters and presented at several international conferences. He is currently Professor in Chemistry at the University of Guyana (South America)