The concentration of a soluble substrate at the surface of an immobilized enzyme is generally lower than that at the surface of a soluble enzyme in the same bulk substrate solution.

Question

BlackTom AI · Accepted Answer

The statement is 'True'. The concentration of a soluble substrate at the surface of an immobilized enzyme is generally lower than that at the surface of a soluble enzyme in the same bulk substrate solution due to mass transfer limitations. In the case of immobilized enzymes, the substrate must diffuse through a boundary layer to reach the enzyme, which often results in a concentration gradient. This gradient is due to the resistance to mass transfer caused by the immobilization matrix or carrier material. The substrate concentration at the enzyme surface is reduced because the diffusion rate is slower than the reaction rate, leading to a lower concentration at the enzyme surface compared to the bulk solution.

In contrast, for soluble enzymes, the substrate and enzyme are both freely diffusing in the solution, which minimizes mass transfer resistance. The substrate can readily reach the enzyme without significant diffusion barriers, maintaining a higher concentration at the enzyme surface. This difference in substrate concentration at the enzyme surface is a key factor in the design and application of immobilized enzyme systems, as it can affect the overall reaction rate and efficiency.

Thus, the correct answer is 'True', as immobilized enzymes experience a lower substrate concentration at their surface compared to soluble enzymes due to the additional diffusion barrier imposed by the immobilization matrix.

The concentration of a soluble substrate at the surface of an immobilized enzyme is generally lower than that at the surface of a soluble enzyme in the same bulk substrate solution.判断题

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