ArticleBeilstein journal of nanotechnology2025
Synthesis and the impact of hydroxyapatite nanoparticles on the viability and activity of rhizobacteria.
Article in Beilstein journal of nanotechnology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Preserving the viability of rhizobacteria during plant application poses a significant challenge when utilizing rhizobacteria as biofertilizers, especially under adverse environmental conditions. Therefore, the selection of a suitable carrier material for rhizobacteria plays a crucial role in ensuring the sustained viability of these microorganisms. Nanomaterials, particularly nanohydroxyapatite (nHA), have garnered attention for sustaining rhizobacterial viability, high loading capacity, high biodegradability, and biocompatibility, which facilitate microbial interactions. In this study, nHA was synthesized using a hydrothermal method and used as a carrier for two rhizobacteria strains (Pd and Tb). The structural and morphological properties of nHA were examined through XRD and scanning electron microscopy analyses. Rhizobacteria were encapsulated within the carrier material, and their viability was evaluated using the total plate count method. Following their immobilization on nHA, the phosphate-solubilizing capacity of rhizobacteria was evaluated using Pikovskaya's medium. A nitrogen-free bromothymol medium was utilized to qualitatively assess the nitrogen-fixing ability of rhizobacteria. Furthermore, rhizobacteria were identified using 16S rRNA gene sequencing, followed by analysis to construct a phylogenetic tree. nHA was found to meet the required quality criteria, exhibiting a spherical morphology with an average particle size of 68 nm and a porosity of 54.78%. The nHA carrier demonstrated favorable physical attributes to sustaining rhizobacterial viability with pH 8.95 and an electrical conductivity of 55.4 μS/cm. Rhizobacteria loaded onto the nHA carrier maintained comparable viability to those without carriers. The highest viability of the rhizobacterial strains Pd and Tb loaded onto the nHA carrier was observed on the seventh day after inoculation, measuring at 2.480 × 10
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