NAD recycling in the collagen membrane

Area of Science:

• Biochemistry
• Biomaterials Engineering
• Enzyme Technology

Background:

• Nicotinamide adenine dinucleotide (NAD) is a crucial cofactor for many enzymatic redox reactions.
• Efficient NAD recycling is essential for the economic viability of biocatalytic processes.
• Collagen membranes offer a promising matrix for enzyme immobilization due to their biocompatibility and structural properties.

Purpose of the Study:

• To investigate NAD recycling within a collagen membrane matrix.
• To evaluate the impact of enzyme immobilization on NAD-dependent reaction rates.
• To explore the use of high molecular weight NAD derivatives for cofactor regeneration.

Main Methods:

• Co-immobilization of alcohol dehydrogenase and lactate dehydrogenase in a collagen membrane.
• Comparison of lactate production rates between immobilized and free enzymes using free NAD.
• Immobilization of dextran-NAD conjugates within the collagen membrane for cofactor recycling.
• Assessment of lactate production using immobilized dextran-NAD without external NAD addition.

Main Results:

• Immobilized enzymes in the collagen membrane exhibited an increased rate of lactate production compared to free enzymes.
• The collagen membrane successfully facilitated NAD recycling using immobilized dextran-NAD.
• Lactate production was achieved using the immobilized system without the need for external NAD addition.

Conclusions:

• Collagen membranes provide an effective matrix for co-immobilizing dehydrogenases and enabling NAD recycling.
• Immobilization enhances enzyme activity and allows for cofactor regeneration, reducing the need for exogenous NAD.
• This approach holds potential for developing sustainable and efficient biocatalytic systems.