Roughened graphite biointerfaced with P450 liver microsomes: Surface and electrochemical characterizations

Area of Science:

• Biochemistry
• Electrochemistry
• Biosensing

Background:

• Drug metabolism assays, toxicity screening, and pollutant biosensing are crucial for pharmaceutical, biomedical, and environmental applications.
• Developing low-cost, efficient biocatalytic systems is a key challenge in these fields.

Purpose of the Study:

• To design and characterize novel biointerfaces for voltage-driven biocatalysis.
• To investigate the electrochemical and electrocatalytic properties of human liver microsomes immobilized on graphite electrodes.
• To demonstrate the utility of these biointerfaces for drug metabolism studies.

Main Methods:

• Human liver microsomes were immobilized onto various roughened, high-purity graphite disk electrodes.
• Electrochemical techniques were employed to study bioelectronic communication and electron-transfer rates.
• Spectral and microscopic characterizations were performed.
• Diclofenac hydroxylation was used as a probe reaction to assess enzyme activity.

Main Results:

• Successful bioelectronic communication and direct electron transfer between the electrode and liver microsomal enzymes were established.
• Specific oxygen reduction currents attributed to microsomal heme enzymes were observed.
• Voltage-driven diclofenac hydroxylation was successfully demonstrated, confirming the biocatalytic activity.

Conclusions:

• The designed biointerfaces offer a promising platform for low-cost, voltage-driven biocatalytic applications.
• These systems facilitate rapid drug metabolism assays and toxicity screening.
• The study highlights the potential for advanced biosensing in environmental and biomedical fields.