Nano-hydroxyapatite was synthesized by means of the hydrothermal treatment. The effects of nano-hydroxyapatite material on the behaviour of G2 liver cancer cells were explored. About 50% of cell viability was lost in nHAp material treated cells at 200 degrees C @ 5 h, followed by -30% in nHAp treated cells at 100 degrees C @ 5 h. Compared with control, nHAp material treated cells at 200 degrees C @ 5 h showed 60% and nHAp material treated cells at 100 degrees C @ 5 h showed 15% morphological change. Moreover, 50% of cell death was observed at 24 h incubation with nHAp material treated at 200 degrees C @ 5 h cells and 56% cell death at 48 h incubation and hence alters and disturbs the growth of cancer cells. In contrast, the nHAp material treated at 100 degrees C @ 5 h protects the cells and could be used for liver cancer cell treatment.

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Recently, multifunctional magnetic nanostructures have been found to have potential applications in biomedical and tissue engineering. Iron oxide nanoparticles are biocompatible and have distinctive magnetic properties that allow their use in vivo for drug delivery and hyperthermia, and as T2 contrast agents for magnetic resonance imaging. Hydroxyapatite is used frequently due to its well-known biocompatibility, bioactivity, and lack of toxicity, so a combination of iron oxide and hydroxyapatite materials could be useful because hydroxyapatite has better bone-bonding ability. In this study, we prepared nanocomposites of iron oxide and hydroxyapatite and analyzed their physicochemical properties. The results suggest that these composites have superparamagnetic as well as biocompatible properties. This type of material architecture would be well suited for bone cancer therapy and other biomedical applications.

Introduction In recent years there has been a steep increase in the number of orthopedic patients for many reasons. One major reason is osteomyelitis, caused by pyrogenic bacteria, with progressive infection of the bone or bone marrow and surrounding tissues. So antibiotics must be introduced during bone implantation to avoid prolonged infection. Aim The objective of the study reported here was to prepare a composite film of nanocrystalline hydroxyapatite (HAp) and polycaprolactone (PCL) polymer loaded with ciprofloxacin, a frequently used antibiotic agent for bone infections. Methods Nanocrystalline HAp was synthesized by precipitation method using the precursor obtained from eggshell. The nanocomposite film (HAp-PCL-ciprofloxacin) was prepared by solvent evaporation. Drug-release and biodegradation studies were undertaken by immersing the composite film in phosphate-buffered saline solution, while a cytotoxicity test was performed using the fibroblast cell line NIH-3T3 and osteoblast cell line MG-63. Results The pure PCL film had quite a low dissolution rate after an initial sharp weight loss, whereas the ciprofloxacin-loaded HAp-PCL nanocomposite film had a large weight loss due to its fast drug release. The composite film had higher water absorption than the pure PCL, and increasing the concentration of the HAp increased the water absorption. The in vitro cell-line study showed a good biocompatibility and bioactivity of the developed nanocomposite film. Conclusion The prepared film will act as a sustainable bone implant in addition to controlled drug delivery.

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