Pulsed electric fields disaggregating chlorophyll aggregates and boosting its biological activity

Area of Science:

• Biophysical Chemistry
• Food Science and Technology
• Materials Science

Background:

• Chlorophyll in solution spontaneously forms aggregates via hydrophobic bonding and π-π stacking.
• These aggregates reduce the biological activity of chlorophyll solutions.
• Understanding factors influencing aggregate structure is crucial for enhancing bioactivity.

Purpose of the Study:

• To investigate the effect of pulsed electric fields (PEF) parameters on chlorophyll aggregate structure.
• To evaluate the impact of PEF treatment on the biological activity of chlorophyll aggregates.
• To elucidate the mechanism by which PEF influences chlorophyll aggregation and bioactivity.

Main Methods:

• Treatment of chlorophyll solutions with varying pulsed electric field (PEF) parameters.
• Scanning Electron Microscopy (SEM) to analyze changes in chlorophyll microstructure.
• Molecular Dynamics (MD) simulations to assess changes in aggregate properties (radius of gyration, SASA, density).

Main Results:

• PEF treatment modified chlorophyll aggregate microstructure, forming smaller particles.
• Smaller chlorophyll aggregates exhibited significantly enhanced antioxidant and anti-inflammatory activities in vitro.
• SEM confirmed PEF-induced alterations in chlorophyll microscopic state.
• MD simulations showed PEF increased aggregate radius of gyration and SASA, while decreasing density.

Conclusions:

• Pulsed electric fields effectively disrupt intermolecular interactions in chlorophyll aggregates.
• PEF treatment leads to chlorophyll disaggregation, resulting in smaller particles with enhanced bioactivity.
• This study demonstrates PEF as a promising method for improving the functional properties of chlorophyll.