A semipermeable enzymatic nanoreactor as an efficient modulator for reversible pH regulation

Area of Science:

• Nanotechnology
• Biochemistry
• Materials Science

Background:

• Enzymatic nanoreactors offer precise control over biochemical reactions.
• Developing stable and controllable nanoreactors for pH modulation remains a challenge.
• Existing pH control methods often require complex instrumentation.

Purpose of the Study:

• To fabricate a novel semipermeable enzymatic nanoreactor for reversible pH switching.
• To utilize amino-functionalized, expanded mesoporous silica nanoparticles (EMSN) as enzyme nanocarriers.
• To protect encapsulated enzymes using polyelectrolyte multilayers (PEMs) for enhanced stability and function.

Main Methods:

• Layer-by-layer (LbL) assembly of PEMs onto EMSN to create semipermeable membranes.
• Encapsulation of enzymes within the PEM-coated EMSN nanoreactors.
• Demonstration of reversible pH switching by controlling enzyme and reactant concentrations.

Main Results:

• Successfully fabricated semipermeable enzymatic nanoreactors with protected enzymes.
• Achieved efficient and reversible pH modulation in aqueous environments.
• PEMs acted as semipermeable barriers, allowing small molecule diffusion while retaining enzymes.

Conclusions:

• The developed enzymatic nanoreactor platform provides a simple, instrument-free method for pH regulation.
• This strategy is versatile and can be adapted for various enzymes and nanocarriers.
• The tunable pH control has potential applications in nucleic acid conformational changes and drug delivery systems.