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What is the name of the method used to attach enzymes to stationary solids by weak physical forces?

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What is the name of the method used to attach enzymes to stationary solids by weak physical forces?

(a) Absorption

(b) Cross linking

(c) Adsorption

(d) Capillary action

This question was posed to me in exam.

Origin of the question is Methods of Immobilization topic in chapter Antibiotics & Enzyme Immobilization of Drug Biotechnology

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The correct option is (c) Adsorption

The best I can explain: Attachment of enzymes to stationary solids by weak physical forces such as Vander waals forces or dispersion forces. Active site is normally unaffected and nearly full activity is observed. Desorption of enzymes is a common problem.

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