Selective extraction of berberine from Cortex Phellodendri using polydopamine-coated magnetic nanoparticles

Area of Science:

• Materials Science
• Analytical Chemistry
• Pharmacognosy

Background:

• Berberine is a key bioactive compound in Cortex Phellodendri with significant medicinal properties.
• Efficient and selective extraction methods are crucial for isolating berberine from complex plant matrices.
• Traditional extraction techniques often lack selectivity and require extensive purification steps.

Purpose of the Study:

• To synthesize and characterize novel polydopamine-coated magnetic nanoparticles (Fe3O4@PDA).
• To evaluate the efficacy of these nanoparticles for solid-phase extraction (SPE) of berberine from Cortex Phellodendri.
• To optimize the SPE conditions for high-purity berberine isolation.

Main Methods:

• Synthesis of Fe3O4 nanoparticles and their subsequent coating with polydopamine.
• Characterization of the core-shell nanoparticles, including their super-paramagnetic properties.
• Optimization of SPE parameters: nanoparticle dosage, desorption solvent, desorption time, and equilibrium time.
• Analysis of berberine purity using the developed SPE method and comparison with the crude extract.

Main Results:

• The synthesized Fe3O4@PDA nanoparticles exhibited a core-shell structure and super-paramagnetism.
• These nanoparticles demonstrated strong and selective adsorption specifically for berberine.
• The optimized SPE method achieved a berberine purity of 91.3%, a significant increase from the initial 9.5% in the extract.
• High recoveries (85.4-111.2%) with low relative standard deviations (0.27-2.05%) were obtained across multiple C. Phellodendri samples.
• The nanoparticles were reusable for multiple extraction cycles, reducing operational costs.

Conclusions:

• Polydopamine-coated magnetic nanoparticles provide a facile, efficient, and highly selective method for berberine isolation.
• The developed SPE protocol offers advantages of easy magnetic separation and reusability of the adsorbent.
• This approach is reliable and applicable for the purification of berberine from different batches of Cortex Phellodendri extracts.