Overview
Hydroxyapatite nanoparticles (HA NPs) are synthetic or naturally derived nanoscale particles of hydroxyapatite, a calcium phosphate mineral that constitutes the inorganic component of bones and teeth. Their structural similarity to biological apatite makes them ideal for biomedical applications. HA NPs are typically synthesized via wet chemical methods, sol-gel processes, or mechanochemical techniques, with precise control over size (10–100 nm) and morphology (spherical, rod-shaped). In addition to biomedical uses, HA NPs are employed in environmental remediation (e.g., heavy metal adsorption) and as additives in cosmetics due to their gentle exfoliating properties. Their high surface area and reactivity enable functionalization with drugs, growth factors, or other biomolecules, expanding their utility in targeted therapies.
Physical and Chemical Properties
HA NPs exhibit a hexagonal crystal structure and a Ca/P molar ratio of 1.67, matching natural bone mineral. Their nano-scale dimensions confer exceptional mechanical strength and bioactivity, promoting cell adhesion and proliferation. Key properties include a high surface-area-to-volume ratio (50–200 m²/g) and tunable porosity, which enhance drug-loading capacity. Thermally, HA NPs are stable up to 1100°C but decompose into β-tricalcium phosphate at higher temperatures. They are insoluble in water but degrade slowly in acidic environments, a property exploited in controlled drug release. Surface modifications (e.g., with silanes or polymers) can alter their hydrophilicity and stability in colloidal suspensions.
Main Applications
In orthopedics and dentistry, HA NPs are used as coatings for implants to improve osseointegration or as fillers in bone cement and scaffolds for tissue engineering. Their ability to mimic bone matrix accelerates healing in critical-size defects. In drug delivery, they serve as carriers for antibiotics, anticancer agents, or proteins, leveraging pH-responsive release in target tissues. Non-medical applications include water purification (adsorbing lead/arsenic) and cosmetic formulations (e.g., toothpaste for enamel remineralization). Emerging uses span 3D printing of bioceramics and as contrast agents in medical imaging due to their X-ray opacity.
Safety and Storage
While HA NPs are generally biocompatible, inhalation of dry powders may cause respiratory irritation. Handling requires dust masks, gloves, and fume hoods. Long-term storage demands airtight containers with desiccants to prevent moisture absorption, which can lead to particle aggregation. Regulatory compliance varies by application; medical-grade HA NPs must meet ISO 13485 or USP standards. Sterilization (e.g., gamma irradiation) is critical for implantable materials but may affect nanoparticle stability. Disposal follows local guidelines for non-hazardous inorganic waste.
B2B Procurement Guide
Bulk buyers should prioritize suppliers offering certificates of analysis (CoA) detailing purity, crystallinity (XRD), and endotoxin levels (<0.25 EU/mg for implants). Customization options (e.g., surface functionalization, particle size ranges) often require MOQs of 100g–1kg. Pricing tiers depend on scale; kilogram orders may reduce costs by 20–30%. For research-grade HA NPs, academic pricing is typically lower, but industrial users should validate batch-to-batch consistency. Lead times vary from 2 weeks (stock items) to 8 weeks (custom synthesis). Key vendors include Sigma-Aldrich, Berkeley Advanced Biomaterials, and specialized nanomaterial manufacturers in China and Germany.
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