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Updated: Jun 13, 2026
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Calcium Medronate-Based Metal-Organic Frameworks as Multifunctional Biomaterials
Pablo Salcedo-Abraira1, María Fernández-Grajera2,3, Francisco A Guerrero-Román1
1Department of Inorganic Chemistry, University of Granada, Avda. Fuente nueva s/n, 18071 Granada, Spain.
Crystal Growth & Design
|June 12, 2025
Summary
Novel calcium-based metal-organic frameworks (MOFs) synthesized from medronic acid show potential for bone healing and infection treatment. These MOFs degrade into bone-like apatite and exhibit antibacterial properties against common pathogens.
Area of Science:
- Materials Science
- Biomedical Engineering
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) are increasingly explored for drug delivery due to their tunable properties.
- Bisphosphonates (BPs), such as medronic acid (MA), are crucial in treating bone diseases like osteoporosis.
- MOFs derived from bioactive molecules offer potential for localized drug release and therapeutic effects in bone regeneration.
Purpose of the Study:
- To synthesize and characterize novel calcium-based MOFs using medronic acid (MA).
- To evaluate the stability and degradation products of these MOFs under simulated physiological conditions.
- To assess the antibacterial activity of the synthesized MOFs against relevant bone infection pathogens.
Main Methods:
- Synthesis of two novel calcium-medronic acid MOFs, GR-MOF-23 and GR-MOF-24, in aqueous and methanolic solutions.
- Characterization of MOF structures and properties.
- Stability testing in phosphate-buffered saline (PBS) at 37 °C to monitor calcium ion release and identify degradation products.
- Antibacterial assays against Escherichia coli and Staphylococcus aureus.
Main Results:
- Successful synthesis and full characterization of GR-MOF-23 ([Ca-(CH4O6P2)·H2O]) and GR-MOF-24 ([Ca-(CH4O6P2)·CH3OH]).
- Progressive calcium ion (Ca2+) leaching observed from both MOFs in simulated physiological conditions (38.0 ± 2.8% and 35.8 ± 3.9% release after 1 week).
- Degradation products identified as apatite and calcium phosphate phases, potentially promoting bone apatite formation.
- Both MOFs demonstrated bacteria growth inhibition; GR-MOF-24 exhibited bactericidal action against E. coli and S. aureus, linked to sustained Ca2+ release.
Conclusions:
- The synthesized calcium-MA MOFs are stable under physiological conditions and degrade into bone-resembling mineral phases.
- GR-MOF-24 shows promising antibacterial activity, suggesting its potential for treating bone infections.
- These novel MOFs offer a dual therapeutic approach for bone fracture treatment and prosthetic applications, combining bone regeneration and antimicrobial properties.
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