Green synthesis of ionic liquid mediated neodymium oxide nanoparticles via Couroupita guianensis abul leaves extract with its biological applications

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Abstract
Bio-nanoparticles have created a new era of rapid, harmless and non-toxic drugs for various biomedical applications. The nanoparticles (NPs) of rare earth metal oxides attract researcher’s attention due to their excellent chemical and physical properties that exhibit potential activity against disease causing pathogens. Couroupita guianensis (C.guianensis) abul is a medicinal plant whose leaves are effectively used for the synthesis of neodymium oxide (Nd2O3) NPs. The 1-butyl 3-methyl imidazolium tetrafluoroborate (BMIM BF4) ionic liquid is used as a stabilizing agent to get better the morphology and biological properties of Nd2O3 NPs. 1-Butene, 4,4-diethoxy-2-methyl is the main compound in C.guianensis abul leaves extract was confirmed by GCMS analysis. The structure of synthesized Nd2O3 (without ionic liquid) and Nd2O3-IL (with ionic liquid) NPs is identified by powder X-ray diffraction (PXRD). The vibrations of the different functional groups were investigated by Fourier-transform infrared (FTIR) and Raman spectroscopy. In UV-Vis spectra, the optical absorption was identified to be 210 and 221 nm of Nd2O3 and Nd2O3-IL samples and the PL spectrum provides blue and green emission peaks at 386 and 554 nm. The X-ray photoelectron spectroscopy (XPS) and DLS spectra illustrate the electronic configuration and particle size of the synthesized Nd2O3-IL NPs. The morphology, surface nature and lattice spacing were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The purity and weight percentage of the compound presented can be identified by the energy-dispersive X-ray spectroscopy (EDX). The biomedical properties such as antibacterial, antioxidant, anti-diabetic, anti-inflammatory and anti-cancer activities were investigated. Finally, the overall biocompatible studies reveal that the ionic liquid assisted Nd2O3 NPs can be considered as a potential drug for pharmaceutical and biomedical applications. Graphical Abstract
Funding Information
  • MHRD, RUSA-Phase 2.0 (F.24-51/2014-U)
  • Dept.of Edn. Govt. of India

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