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All Journal African Journal of Biochemistry and Molecular Biology Research Open Access DRIVERset Kwaghe International Journal of Sciences and Technology Open Access DRIVERset African Journal of Medicine, Surgery and Public Health Research
Danjuma, Tyem Lawal
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science Immunology & microbiology Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology Nursing Public Health Social Sciences

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Antibacterial Effect of Methanol Extract of Newbouldia laevis Leaves on Some Selected Resistant Pathogen on Synthesised Drugs Umaru, Kerenhappuch Isaac; Ugoeze, Egeonu Stephen; Tansaba, Akafa Andes; Nanmar, Chakfa; Danjuma, Tyem Lawal; Umaru, Isaac John
Kwaghe International Journal of Sciences and Technology Vol 1 No 1 (2024): Kwaghe International Journal of Sciences and Technology
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/kijst.v1i1.3399

Abstract

Newbouldia laevis is a tropical plant belonging to the family of Bignoniaceae. It is among the most useful plants in Africa. Historically medicinal plants have been provided a good source of inspiration for novel therapeutic drugs which has made a large contribution to health and well-being of humans. It has been used over the years to as curative agents against many infections and have been exploited in the traditional medicine with their curative potentials. Material and methods: The leaves of Newbouldia laevis was bought from a local market in Wukari, Taraba State. The leaves of Newbouldia laevis was chop into pieces, air-dried for four days and then pulverized into fine powder. About 250 g of the powdered bark extracted with 2 L of ethanol using maceration method for 72 hrs. The crude extracts of Newbouldia laevis was used in antibacterial assay. The results observed demonstrate that the Newbouldia leaves methanol crude extract possesses concentration-dependent antibacterial activity against both Gram-positive resistant bacteria (Staphylococcus aureus) and Gram-negative (Escherichia coli, Klebsiella pneumonia) bacteria. The increasing inhibition zones with higher concentrations suggest a potential dose-response relationship.
Impact of Distinct Carbon Substrates on the Proliferation of Antimicrobial-Producing Microbes Umaru, Isaac John; Danjuma, Tyem Lawal; Akem, Ingwu Joseph; Salman, Julius Ishaya; Ahmed, Maryam Usman; Umaru, Hauwa A.
Kwaghe International Journal of Sciences and Technology Vol 3 No 2 (2026): Kwaghe International Journal of Sciences and Technology
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/kijst.v3i2.9474

Abstract

Microbial production of antimicrobial compounds remains a fundamental area of biotechnology and pharmaceutical development, and its efficiency is strongly influenced by the carbon source available in the growth medium, which functions not only as an energy substrate but also as a regulator of microbial metabolism and secondary metabolite synthesis. This study aimed to evaluate the effects of five carbon sources—glucose, lactose, sucrose, starch, and glycerol—on microbial biomass yield, strain-specific growth preferences, metabolic compatibility, antimicrobial potency, inhibition zones, and bioactive metabolite production. Seven microbial strains, including Streptomyces, Bacillus, Pseudomonas, Actinomyces, and Clostridium, were cultured in media supplemented with each carbon source. Biomass yield was measured gravimetrically, growth rate indices were calculated on a scale of 0–10, antimicrobial potency was assessed using zone of inhibition assays against S. aureus, E. coli, P. aeruginosa, and K. pneumoniae, and metabolite yield was quantified in mg/L using spectrophotometric analysis. All experiments were conducted in triplicate. The findings showed that glucose produced the highest biomass yield and growth rates across all strains, with Bacillus and Pseudomonas each scoring 10. Lactose demonstrated selective effectiveness, particularly for Streptomyces, whereas sucrose supported moderate growth and selective antimicrobial activity. In contrast, starch and glycerol consistently resulted in low biomass production and minimal antimicrobial potency. The zone of inhibition results further confirmed that glucose and lactose were the most effective substrates, with inhibition zones exceeding 20 mm. Similarly, metabolite yield was highest with glucose (120 ± 5.4 mg/L) and lactose (115 ± 4.9 mg/L), while glycerol produced the lowest yield (30 ± 1.5 mg/L). The study concludes that carbon source selection plays a critical role in microbial proliferation and antimicrobial compound production, with glucose and lactose emerging as the most suitable substrates for broad-spectrum antimicrobial activity and high metabolite yield. These findings contribute practical evidence for optimizing fermentation strategies according to microbial metabolic profiles to enhance antimicrobial synthesis.
Co-Authors Ahmed, Maryam Usman Akem, Ingwu Joseph Asare, Solomon O. Mchibuma, Jibaniya Grace Nanmar, Chakfa Rebecca, Tsokwa Punarimam Salman, Julius Ishaya Shadrach, Katchim Evelyn Tansaba, Akafa Andes Ugoeze, Egeonu Stephen Umaru, Hauwa A. Umaru, Isaac John Umaru, Kerenhappuch Isaac Yeboah, Genevieve A.