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Evaluation of the Efficacy of Albizia zygia Extracts on Bacterial Inhibition in Aquatic Microcosm

Journal of Geoscience and Environment Protection 2023年第7期11卷 227-241页

作者： Yves Yogne Poutoum luciane marlyse moungang Blandine Pulcherie Tamatcho Kweyang Thierry Youmbi Fonkui Golda Reine Zame Meva’a Aurélie Dzenga Njeunkam Mouhama Sani Adams Ibn Rabiou Moïse Nola Department of Animal Biology and Physiology Faculty of Sciences University of Yaounde I Yaounde Cameroon Department of Microbiology Faculty of Sciences University of Yaounde I Yaounde Cameroon Department of Biotechnology and Food Technology Faculty of Sciences Doornfontein Campus University of Johannesburg Johannesburg South Africa

The objective of this study is the phytochemical analysis and the determination of the antibacterial activity of aqueous and hydro-ethanolic extracts obtained from the leaves and bark of the trunk of Albizia zygia, against Escherichia coli and Salmonella typhi bacteria in aquatic microcosms. Phytochemical screening was performed as described by Pareck. The results obtained show that the hydro-ethanolic and aqueous extracts of Albizia zygia trunk bark recorded higher extraction yields (26.71% and 33.2% respectively) compared to the aqueous and hydro-ethanolic extracts of leaves of the same plant. Secondary metabolites with antibacterial activities such as anthraquinones, anthocyanins, flavonoids, polyphenols, tannins and saponins were found in both types of extracts. Flavonoids and anthocyanins were relatively more abundant than the other chemical constituents. The highest cellular inhibition rate of Escherichia coli was 99.88%, obtained after 9 hours of exposure in the hydro-ethanolic extract solution of trunk bark at the concentration 1.5 g/L. The Salmonella typhi rate was 99.95% after 9 hours of exposure of bacterial cells to the hydro-ethanol extract of the bark of the trunk at the concentration 1.5 g/L. This rate increased proportionally with the bacterial-extract contact time. The temperature of the medium did not significantly influence bacterial inhibition (P > 0.05). The obtained results justify the use of the plant Albizia zygia in the reduction of the flow of bacterio-pollutants contained in water intended for consumption.

关键词： Albizia zygia Extract Phytochemical Screening Bacterial Inhibition Aquatic Microcosms

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Bacteriological and Physico-Chemical Characterisation of Liquid Wastes: The Case of the University Hospital Centre (UHC) of Yaoundé-Cameroon

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Journal of Geoscience and Environment Protection 2022年第6期10卷 170-190页

作者： luciane marlyse moungang Blandine Pulchérie Tamatcho Kweyang Lisyane Merveille Betyi Roland Ndifor Ache Yves Poutoum Yogne Mouhama Sani Adams Ibn Rabiou Golda Reine Zame Meva’a Aurélie Dzenga Njeunkam Claire Stephane Metsopkeng Serge Hubert Zebaze Togouet Laboratory of Hydrobiology and Environment Department of Animal Biology and Physiology Faculty of Sciences University of Yaoundé I Yaoundé Cameroon Department of Microbiology Faculty of Sciences University of Yaoundé I Yaoundé Cameroon Department of Organic Chemistry Faculty of Sciences University of Yaoundé I Yaoundé Cameroon Higher Technical Teachers Training College University of Bamenda Bamenda Cameroon

The untreated effluents generated by hospital activities contribute to the dissemination of pathogenic germs and multi-resistant bacteria, thus presenting a great potential danger for health and the environment. The objective of this study was to evaluate the microbiological and physico-chemical quality of the effluents of the Yaoundé University Hospital Centre and their impact on the environment. It was a prospective and analytical study on three sites where hospital effluents from the intensive care unit (Station A), the upstream of the wastewater treatment plant (Station B), and the gynaecology, surgery and hospitalisation departments (Station C) were sampled. Samples were collected in sterile glass bottles for bacteriological analyses and polyethylene bottles for physico-chemical analyses. The bacteriological parameters measured showed that the density of the bacterial species sought was very high at Station B with a predominance of the species Escherichia coli (57.36%). At Station A, total coliforms were very abundant (50.12%) and at Station C, the genus Pseudomonas was predominant (14.69%). Bacteria of the genus Streptococcus were represented by three species, namely: Streptococcus agalactiae, Streptococcus faecalis, and Streptococcus pneumoniae. The Pseudomonas genus was also represented by 3 species, namely Pseudomonas aeruginosa, Pseudomonas maltophilia and Pseudomonas putida. The physico-chemical parameters showed that apart from temperature and conductivity, which were in compliance with the standards, the other had values higher than these standards. This study shows that untreated hospital effluent contains most of the bacteria involved in community, nosocomial infections and would be a potential source of risk to the surrounding population.

关键词： Characterisation University Hospital Centre Effluents Bacteriology of Effluents Physico-Chemistry of Wastewater

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