Gr/TiO₂ Films with Light-Controlled Positive/Negative Charge for Cell Harvesting Application

Area of Science:

• Biomaterials Science
• Cell Biology
• Nanotechnology

Background:

• Light-induced cell detachment is a promising technique for in vitro cell culture.
• Existing methods may lack efficiency or require specific wavelengths.
• Novel materials are needed to improve light-responsive cell harvesting.

Purpose of the Study:

• To design and evaluate a light-responsive graphene (Gr)/titanium dioxide nanodot (TN) film for efficient cell detachment.
• To investigate the mechanism behind light-induced cell harvesting using this film.
• To assess the film's effectiveness with different light sources (UV and visible).

Main Methods:

• Fabrication of a monolayer graphene (Gr)/titanium dioxide nanodot (TN) film.
• Illumination of the film with 365 nm UV light and 450 nm visible light.
• Assessment of cell detachment ratios for various cell types.
• Analysis of the mechanism involving charge accumulation and extracellular matrix protein conformation.

Main Results:

• The Gr/TN film demonstrated effective cell detachment after 20 minutes of light exposure.
• A maximum cell detachment ratio of approximately 95% was achieved.
• Both UV and visible light initiated the detachment process.
• Light-induced charge accumulation alters extracellular matrix protein conformation, leading to cell detachment.

Conclusions:

• The developed Gr/TiO2 film is a highly effective material for light-induced cell detachment.
• The film responds to both UV and visible light, offering versatility.
• This technology presents a valuable advancement for cell harvesting in in vitro applications.