Hydroxyapatite (HA)-coated magnetite nanoparticles (MNPs) are being widely investigated for various applications in medical engineering and wastewater treatment. In this work, the MNPs were thoroughly coated by bacterial synthesized HA nanoparticles during biomineralization process using Enterobacter aerogenes. The resulting bacterial-induced precipitate was then calcined at 600°C and investigated with respect to structural characteristics, particle size and magnetic strength by XRD, FT-IR, SEM, EDS, TEM and VSM analyses. The effects of MNPs and HA-coated MNPs (HA-MNPs) on the viability of human MCF-7 cell lines were also investigated via mitochondrial activity test (MTT) and lactate dehydrogenase (LDH) assays. The powder characterization results showed appropriate structural properties for HA-MNPs samples. The particles diameter size of the MNPs and HA-MNPs were in the range of 3-25nm and 20-80nm, respectively. The biologically-synthesized HA-MNPs formed a stable suspension in water while keeping their magnetic property. The saturation magnetization (Ms) of HA-MNPs was measured at ~10emug which was in good agreement with the structural composition of this sample. Finally, the results of the cell lines viability indicated that coating of toxic MNPs via biomineralization was a promising approach in order to synthesize bio-compatible magnetic nanoparticles with suitable physical and chemical structural characteristics. The toxicity level of MNPs was reduced by 10 fold when coated by bacterial-synthesized HA.
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http://dx.doi.org/10.1016/j.msec.2016.12.012 | DOI Listing |
J Hazard Mater
January 2025
Departamento de Química Orgánica y Bio-Orgánica, Universidad Nacional de Educación a Distancia (UNED), Avenida de Esparta s/n, Las Rozas de Madrid 28232, Spain. Electronic address:
Magnetite nanoparticles have been successfully used for removal and immobilization of contaminants in water, yet their application in soils combined with in situ magnetic separation remains unexplored. We evaluated the effectiveness and optimal conditions for using magnetite nanoparticles combined with magnetic separation to remove metal(loid)s from contaminated mine soils. Soil samples were incubated (15, 45 days) with varying doses of magnetite (0, 25, 50 g kg⁻¹) and moisture (dry, field capacity) and separated using electromagnet or permanent magnet.
View Article and Find Full Text PDFBiomed Chromatogr
February 2025
Department of Pharmacy, Lianyungang Affiliated Hospital of Nanjing University of Chinese Medicine, Lianyungang, China.
Choerospondias axillaris is a medicinal plant used for treating coronary heart disease (CHD) due to its broad spectrum of anti-inflammatory activities. Cyclooxygenase 2 (COX-2) and lipoxygenase 5 (5-LOX) were immobilized on magnetic nanoparticles for selective ligand-extraction of these two enzymes present in C. axillaris.
View Article and Find Full Text PDFFood Res Int
January 2025
State Key Laboratory of Marine Food Processing and Safety Control, Dalian Polytechnic University, Dalian 116034, Liaoning, China. Electronic address:
The acidophilic and heat-resistant characteristics of Alicyclobacillus acidoterrestris (A. acidoterrestris) pose significant challenges to fruit juice production. Traditional thermal removal methods are often ineffective against this resilient bacterium.
View Article and Find Full Text PDFChemosphere
January 2025
Sustainability of Natural Resources and Energy Program, Cinvestav-Saltillo, Coahuila. C.P. 25900, Mexico.
There is a debate about the implications of the effect of nanoparticles or nanomaterials on edible plants and soil organisms. Earthworms have been used to evaluate soil quality, reproduction, survival, and other biochemical parameters when organisms are exposed to nanomaterials. Most studies have been performed in laboratory settings, and little has been studied under realistic conditions, especially when earthworms and corn plants share the same natural soil and organic matter space.
View Article and Find Full Text PDFAppl Microbiol Biotechnol
January 2025
National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt.
Iron oxide nanoparticles, recognized for their superparamagnetic properties, are promising for future healthcare therapies. However, their extensive use in medicine and electronics contributes to their discharge into our environments, highlighting the need for further research on their cellular damage effects on aquatic organisms. While the detrimental properties of other compounds have been stated in the early-life stages of fish, the cytotoxic consequences of superparamagnetic iron oxide nanoparticles (SPIONs) in these stages are still unexplored.
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