Before performing any kind of immobilization techniques, some factors should be in mind. It is necessary to understand the chemical and physical effects on an enzyme following immobilization. Enzyme stability and kinetic characteristics can be altered due to changes in the microenvironment conditions of the enzyme after entrapment, support material attachment, or products of enzymatic actions for instance. Additionally, it is important to consider maintaining the tertiary structure of an enzyme prior to immobilizing to have a functional enzyme. Similarly, another crucial site for the functionality of an enzyme is the active-site, which should also be maintained while enzyme is being attached to a surface for immobilization, it is a must to have a selective method for the attachment of surface/material to not end up with an immobilized, but dysfunctional enzyme. Consequently, there are three foundational factors to be thought of for the production of functional immobilized enzymes: immobilization supports selection, conditions and methods of immobilization.