Browsing by Author "Dedeke, Gabriel A."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Microbial Nano-remediation of Microplastics: A review
    (S. Afr. J. Chem, 2024) Akinhanmi, Fadekemi O.; Ayanda, Opeyemi I.; Dedeke, Gabriel A.
    Microplastics’ ubiquity in all environmental matrices worldwide, coupled with poor plastic waste management practices, calls for serious health and environmental attention. Microplastics are persistent and slow-degrading contaminants with a high potential to fragment as well as adsorb other contaminants. Along with macroplastic waste reduction methods such as incineration, recycling, landfilling, pyrolysis, and bioremediation approaches novel methods to remove microplastics from the environment are necessary. The multidisciplinary and progressive area of science, nanotechnology, has the potential for diverse applications with engineered nanomaterials that have superior properties over micro-particles because of their size and surface area ratio. The integration of microbial remediation and nanotechnology holds great promise for the nano-remediation of persistent environmental microplastics. Here, we review plastic-degrading microbes (Bacillus sp., Diplococcus sp., Klebsiella sp., Moraxella sp., Streptococcus sp., Staphylococcus sp., Micrococcus, Pseudomonas, Aspergillus sp), microbial synthesis of nanoparticles (Zinc oxide, iron oxide, copper oxide, magnesium oxide, titanium oxide and others), and nanoparticle synthesis with plastic-degrading microbes. This article also discusses the mechanism of microbial nano-remediation and microbial interactions with nanomaterials. The advantages, limitations, and prospects of microbial nano-remediation of microplastics are discussed. This review suggests the use of metagenomics to further identify a wider range of organisms for bioremediation of microplastics, while also proposing the use of artificial intelligence for the construction of immobilized microbial nano-enzyme composites for degrading microplastics faster
  • No Thumbnail Available
    Item
    Potential impacts of microplastic ingestion: Oxidative stress level in commercial fish from the Lagos Lagoon, Nigeria
    (Preprints, 2025) Akinhanmi, Fadekemi O.; Ayanda, Opeyemi I.; Dedeke, Gabriel A.
    The presence of microplastics (MPs) in aquatic systems and the tissues of commercially available fish species poses risks and potential impacts on human health. While MPs have been reported in the surface water, benthic sediment, and edible fish species in the Lagos Lagoon, the possible effects of these contaminants on fish species have been lacking. This study aimed at providing vital information on MP contamination in the Lagos lagoon and highlighting the probable effects on the visceral organs of four fish species, Tilapia (Orechromis niloticus, n=16), Silver catfish (Chrysichthys nigrodigitatus, n=16), African knifefish (Gymnarchus niloticus, n=16) and African catfish (Clarias gariepinus, n=16). Gill, stomach, and liver of the sample specimen were examined for MP contamination and oxidative stress. MP accumulation in all the fish species differed but was detected in all tissues. The most abundant MP type was fibers (64%), followed by fragments (24%). Polyethylene, polychloroprene, polypropylene, and polystyrene were detected by Fourier transform infrared spectroscopy. Oxidative stress analysis of the fish tissues revealed significantly high antioxidant activities (p ≤ 0.05) and lipid peroxidation levels in the microplastic-contaminated tissues. Although this study highlights the possible effects of microplastics on wild fish species, extensive research is necessary to elucidate the cause-effect relationship of environmentally relevant microplastics on fish tissues to conduct as well as report associated risk assessments