National University Biomedical Research Institute (NUBRI)
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Item Green synthesis of silver nanoparticles using Sudanese Candida parapsilosis: a sustainable approach to combat antimicrobial resistance(BMC Microbiology, 2025) Ibrahim, Nesreen A. A.; Saeed, Humodi A.; Saeed, Samar M.; Mohamed, Osama; Suliman, Omnia H.; Ibrahim, Sabah A. E.; Mohamed, Sofia BBackground Antimicrobial resistance (AMR) is a critical global health challenge, particularly in Sudan, where the overuse and misuse of antibiotics have driven the rise of multidrug-resistant (MDR) pathogens. Conventional antimicrobial strategies often fall short due to rapid resistance development and limited efficacy, highlighting the need for novel approaches. Nanotechnology offers promising alternatives, with silver nanoparticles (AgNPs) demonstrating potent broad-spectrum antimicrobial activity. This study aims to develop an eco-friendly synthesis of AgNPs using Candida parapsilosis (C. parapsilosis), an untapped yeast strain isolated from Sudanese soil, to combat AMR. Results Biosynthesis of AgNPs using C. parapsilosis was successfully confirmed through UV-Vis spectroscopy, X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HRTEM), revealing well-defined nanoparticles. The biosynthesized AgNPs exhibited strong antibacterial activity against both ATCC reference strains and MDR clinical isolates of Gram-positive and Gram-negative bacteria, with inhibition zones increasing in a concentration-dependent manner. At optimal concentrations, inhibition zones reached 29 mm for Pseudomonas aeruginosa (P.aeruginosa) (ATCC 27853), while clinical isolates of Salmonella typhi (S. typhi) (24.5 ± 0.58 mm) and Escherichia coli (E. coli) (23.8 ± 0.79 mm) exhibited significant susceptibility. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) assays demonstrated potent bactericidal activity, particularly against E. coli and Klebsiella pneumoniae (K. pneumoniae) at 0.3125 mg/mL. Furthermore, AgNPs synergistically enhanced the efficacy of conventional antibiotics in a species- and antibiotic-dependent manner. The strongest synergy was observed in Enterococcus faecalis (E. faecalis) (up to 9.84-fold with Colistin) and Acinetobacter baumannii (A. baumannii) (up to 5.11-fold with Ceftazidime), suggesting that AgNP-enhanced antibiotic efficacy varies depending on bacterial species, nanoparticle synthesis method, and antibiotic type. Conclusions This study presents a novel and sustainable approach to tackling AMR by leveraging Sudanese yeast strains for the green synthesis of AgNPs. The findings underscore the potential of AgNPs as an effective antibacterial agent, both independently and in combination with conventional antibiotics, to combat MDR pathogens. By integrating microbiology and nanotechnology, this research offers a cost-effective and environmentally friendlyItem Extraction and Identification of Fungi from Different Sudanese Soil(Journal of Measurement Science & Applications, JMSA, 2024) Ibrahim, Nesreen A. A.; Saeed, Humodi A.; Saeed, Samar M.; Ibrahim, Sabah A. E.; Mohamed, Sofia B.; Ahmed, Mohamed E. N.The biosynthesis process utilizing fungi and other microorganisms is an essential sustainable method for the manufacture of nanomaterials, aligning with sustainable development goals. Consequently, the extraction and accurate identification of fungi from soil is strongly advised. In this study, various fungus species were collected from different Sudanese agricultural soil at various locations. Afterwards, the fungi were extracted and identified. The fungi have been isolated were then identified to the genus level and to the species according to the basis of macro morphological. Thus, the colonies were investigated for slow or for rapid growth, also based on topography and texture. Interestingly, the identification methods used for fungi isolated displayed that various fungi have been successfully identified. Thus, based on the culture method, there are fungal species of 121 species with 100% were recognized. However, based on the microscopic investigation there are 102 species of fungal species were identified. However, based on the molecular method the identified fungi were found to be 90 of the fungal species isolated.