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The rapid nucleic acid extraction is essential, particularly the communicable diseases pandemic. In this work, aluminum modified Fe 3 O 4  (Fe 3 O 4 @Al 3+ ) particles were successfully synthesized by solvthermal method, epoxidation, covalent binding of iminodiacetic acid and Al 3+  ions coordination for DNA extraction. Fe 3 O 4 @Al 3+  particles could greatly improve the efficiency of DNA extraction and the extraction could be totally completed within 15 minutes at the optimum condition. The simple and rapid method is mainly based on the Fe 3 O 4 @Al 3+  particles, which have large specific surface area, superparamagnetism, and Al 3+  ions affinity to DNA. Additionally, several characterizations were carried out to further investigate the features of Fe 3 O 4 @Al 3+  particles. According to SEM image, the average dimension of monodispersed Fe 3 O 4 @Al 3+  spheres was around 200 nm. XPS results showed the existence of Al 3+  on the surface of Fe 3 O 4  particles, which further demonstrated the success of metal chelation in this material synthesis. The XRD patterns indicated that the Fe 3 O 4 @Al 3+  particles were the inverse spinel structure as the bare Fe 3 O 4  particles. Good magnetism of Fe 3 O 4 @Al 3+  particles determined by VSM indicated that this material could be easily separated from the reaction system. To summarize, Fe 3 O 4 @Al 3+  particles is expected to play an important role in future DNA extraction due to remarkable performance.HighlightsThe DNA separation media Fe 3 O 4 @Al 3+  particles were successfully synthesized.DNA adsorption was effectively achieved by Fe 3 O 4 @Al 3+  particles based on metal chelation.DNA extraction was significantly boosted by Fe 3 O 4 @Al 3+  particles. The DNA separation media Fe 3 O 4 @Al 3+  particles were successfully synthesized. DNA adsorption was effectively achieved by Fe 3 O 4 @Al 3+  particles based on metal chelation. DNA extraction was significantly boosted by Fe 3 O 4 @Al 3+  particles.

Synthesis of magnetic Fe 3 O 4 @Al 3+ particles and its application in DNA extraction