Search

Biopolymer coated magnetic nanoparticles are becoming extremely popular in the fields of biomedical research because of their enormous applications potentials. In this work, first, CoFe 2 O 4 nanoparticles (CF NPs) of two distinct sizes have been prepared following co-precipitation method by varying the synthesis parameters and characterized. XRD, SAED and IFFT (Inverse Fast Fourier Transformed) assisted HRTEM analyses confirmed the successful formation of monodispersed spinel cubic CoFe 2 O 4 nanoparticles. Particles size of CF NPs was found to increase with increase in the amount of reducing agent. Synthesized CF NPs was coated with an egg albumen matrix by a facile and environmental friendly method to form biocompatible CoFe 2 O 4 @Albumen nanocomposite nanoparticle (CF@Alb NP). Prepared CoFe 2 O 4 and CoFe 2 O 4 @Albumen nanoparticles were examined for its structure, morphology, thermal stability and magnetic nature employing powder XRD, HRTEM, TGA, FTIR and VSM techniques. Low as well as high magnification TEM analyses have shown coating of amorphous albumen on crystalline CF NPs. It was observed that CF@Alb NP is composed of many smaller CF NPs engulfed in the albumen matrix forming a nano-aggregate of size ∼80–130 nm. IFFT analysis of HRTEM micrograph showed presence of crystalline CF NPs in amorphous albumen matrix. Further, TGA and FTIR results also suggested the successful coating of albumen on CF NPs. CF@Alb NP has shown a very good Dox loading ability with loading efficiency of ∼93%. A promising pH dependent Dox release behavior was observed. Dox release kinetics has also been studied using different mathematical models. Biocompatibility of the CF@Alb NP has been tested against the human monocytic cell line THP-1. This novel CF@Alb NP could have a great potential in biomedical applications, particularly in hyperthermia and targeted drug delivery. [ABSTRACT FROM AUTHOR]

Uses of biopolymers for the development of nanocarriers are receiving significant attention due to its biocompatible and biodegradable nature. Neem (Azadirachta indica) is a well known medicinal plant and it is reported that the polysaccharides and limonoids present in the neem extract prevent the growth and proliferation of cancer cells. In this work, we have synthesized neem gum (NG) coated Fe 3 O 4 nanoparticles (NPs) based novel nanobiocomposite (Fe 3 O 4 @NG NBC) by simple sonochemical method and characterized it for structural, microstructural and magnetic properties. The morphology, structure, and magnetic properties of the prepared Fe 3 O 4 NPs and Fe 3 O 4 @NG nanobiocomposite were investigated by X-ray diffractometer (XRD), Fourier-transform infrared (FTIR), Transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM) analysis. XRD pattern, TEM micrograph and FTIR spectra confirmed the successful coating of neem gum on Fe 3 O 4 nanoparticles. IR spectra of Fe 3 O 4 @NG nanobiocomposite revealed the presence of specific bands corresponding to both neem gum and Fe 3 O 4 NPs, which confirmed the formation of Fe 3 O 4 @NG NBC. The obtained size of Fe 3 O 4 @NG nanobiocomposite particles was ∼50–400 nm. VSM analysis confirmed the superparamagnetic nature of both Fe 3 O 4 NPs and Fe 3 O 4 @NG nanobiocomposite. Fe 3 O 4 @NG nanobiocomposite was loaded with anticancer drug doxorubicin (Dox) and its release behaviour was studied at pH 7.4 and 5. Faster release of Dox was observed in acidic environment. In vitro cytotoxicity of the prepared Fe 3 O 4 @NG NBC against human monocytic cell line THP‐1 was also studied by MTT assay. This novel Fe 3 O 4 @NG nanobiocomposite with low toxicity, biodegradability, water dispersability, excellent drug loading ability and good magnetic controllability could offer potential applications in biomedical field including targeted drug delivery for cancer diagnosis and treatment in near future. [ABSTRACT FROM AUTHOR]

A novel visible light active and magnetically separable nanophotocatalyst, Ni 0.5 Zn 0.5 Fe 2 O 4 /Zn 0.95 Ni 0.05 O (denoted as NZF@Z), with varying amount of Ni 0.5 Zn 0.5 Fe 2 O 4 , has been synthesized by egg albumen assisted sol gel technique. The structural, optical, magnetic, and photocatalytic properties have been studied by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), fourier transform infrared spectroscopy (FTIR), UV–visible (UV–Vis) spectroscopy, and vibrating sample magnetometry (VSM) techniques. Powder XRD, TEM, FTIR and energy dispersive spectroscopic (EDS) analyses confirm coexistence of Ni 0.5 Zn 0.5 Fe 2 O 4 and Zn 0.95 Ni 0.05 O phases in the catalyst. Crystallite sizes of Ni 0.5 Zn 0.5 Fe 2 O 4 and Zn 0.95 Ni 0.05 O in pure phases and nanocomposites, estimated from Debye–Scherrer equation, are found to be around 15–25 nm. The estimated particle sizes from TEM and FESEM data are ∼(22 ± 6) nm. The calculated energy band gaps, obtained by Tauc relation from UV–Vis absorption spectra, of Zn 0.95 Ni 0.05 O, 15%NZF@Z, 40%NZF@Z and 60%NZF@Z are 2.95, 2.72, 2.64, and 2.54 eV respectively. Magnetic measurements (field (H) dependent magnetization (M)) show all samples to be super-paramagnetic in nature and saturation magnetizations (M s ) decrease with decreasing ferrite content in the nanocomposites. These novel nanocomposites show excellent photocatalytic activities on Rhodamin Dye. [ABSTRACT FROM AUTHOR]

Highlights: [•] PANI/CoFe2O4 nanocomposites (PANI@CF-1:1 and 1:2) have been successfully synthesized. [•] Nanocomposites properties modified by the addition of varying amount of the CoFe2O4 NPs into the PANI. [•] Nanocomposite (PANI@CF-1:2) showed the photocatalysis of MO dye via production of ROS. [Copyright &y& Elsevier]