Size Reduction of Bulk Alumina for Mass Production of Fluorescent Nanoalumina by Fungus Humicola sp.
In recent years, nanomaterials have made their way into hundreds of biomedical, life-sciences and technological applications. One such nanomaterial of extreme importance is nanoalumina (Al2O3 nanoparticles). This nanomaterial is an epitome of diversity with applications exhibited in the fields of catalysis, cosmetics, theranostics, energy generation, biosensors, drug-delivery, tumor-regression, etc. However, problems persist in terms of biocompatibility, cost-effectiveness, reproducibility and mass-production of nanoalumina by the presently existent physical, chemical and biological methodologies. Herein, we for the first time are presenting a top-down biofabrication method by which size reduction of commercial bulk alumina/aluminum oxide (5 µm) into nanoalumina (5–25 nm) is carried out by a thermophilic fungus Humicola sp. within 96 h of reaction at just 50 °C. The so-formed nanoalumina is highly stable, water dispersible, fluorescent and natural protein capped; characterization engaged standard techniques. These nanoparticles exhibit anti-bacterial properties against Gram-positive Bacillus subtilis strain and may serve as broad spectrum bactericidal agents. We believe that our novel top-down approach may be extensively used in the facile, inexpensive, eco-friendly and reliable fabrication of abundant quantities of nanomaterials of different chemical compositions, sizes and shapes with better control and predictability over the properties as derived from their substrates. The mechanistic aspect of said protocol is underway.
KeywordsAlumina Nanoalumina Biocompatibility Reproducibility Mass production Fluorescent Bactericidal
SM thanks the UGC, New Delhi for Maulana Azad National Fellowship (MANF) and AcSIR, New Delhi. AA thanks the Department of Biotechnology, Government of India (New Delhi) for the Tata Innovation Fellowship award and financial support through BSC0112 CSIR. The authors thank Centre for Materials Characterization (CSIR-NCL) for assistance regarding TEM and XRD measurements.
Compliance with Ethical Standards
Conflict of interest
The authors declare that there is no conflict of interest amongst them.
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