The reaction between an antibody and an antigen is a so specific process that it can always be observed under microscope for various reasons. This is made possible particularly given that the reaction take place only between an antigen and its corresponding group of antibodies. For this reason, antibody labeling is done to observe the reaction process for localization, quantification or even detection purpose.
The modern technology gives various options of antibody labeling. Some of the most common tracers used include enzymes, metallic substances like colloidal gold, radioactive biotin and even fluorochromes. An enzyme histochemical procedure under chromogenic reaction in particular works when the microscope used is a light microscope. When using fluorescent microscope however, the appropriate tracer to use id the fluorochromes. Colloidal gold works under electron miscoscope while biotin works under all the three visualization methods.
There are two major antibody labeling methods. These are covalent method which is highly technical and very expensive hence not common and an alternative method known as the non-covalent method. The later method is considered more economical and flexible and is now the most used method in the majority of laboratories.
Covalent method involves introduction of labels into the antibodies through chemical means. In order to achieve this process, a number of functional groups of antibodies are targeted using a group-specific reagent. This requires a large quantity of purified antibodies which is definitely expensive. In addition to this, the technicians involved must be knowledgeable in dialysis method of conjugate purification, how to use the desalting spectra and absorbance spectra taking.
In a covalent procedure, haptens such as biotin, enzymes, fluorophores, and DIG which are commercially available are added into a protein molecule. This is done via the process of reacting activated ester and the primary amino groups. Given that the majority of amino groups sold have BSA as a stabilizer which reduces efficiency during reaction, the LinkTM conjugation system (patented) is the technology that enables preparation of good quality conjugates even in the presence of high concentration of BSA.
When it comes to non-covalent method, the procedure is much simpler and more cost effective. It involves the use of fragments associated with bridge monovalent Fab. The labeling complex is obtained from a mixer of the unconjugated primary antibodies with the monovalent Fab fragments.
In both methods, localization, observation and measurement of both the antigen and the antibodies is possible with the effectiveness and efficiency highly depending on the method and substrate used. Some of the most commonly used agents when it comes to cross linking include maleimide derivatives, glutaraldehyde and m-periodate. All these are commercially available replacing many agents that were widely used in the past.
The labels to choose from are so many largely depending on the microscope to be used and the procedure to be adopted. For a success process of antibody labeling however, there are many other factors that greatly matters. These include the level of experience of the researchers, how well the laboratory is equipped, the reagents used among others. It is however important to understand that some methods allows multiple labeling of the targeted antibodies in a single incubation and sample.
The modern technology gives various options of antibody labeling. Some of the most common tracers used include enzymes, metallic substances like colloidal gold, radioactive biotin and even fluorochromes. An enzyme histochemical procedure under chromogenic reaction in particular works when the microscope used is a light microscope. When using fluorescent microscope however, the appropriate tracer to use id the fluorochromes. Colloidal gold works under electron miscoscope while biotin works under all the three visualization methods.
There are two major antibody labeling methods. These are covalent method which is highly technical and very expensive hence not common and an alternative method known as the non-covalent method. The later method is considered more economical and flexible and is now the most used method in the majority of laboratories.
Covalent method involves introduction of labels into the antibodies through chemical means. In order to achieve this process, a number of functional groups of antibodies are targeted using a group-specific reagent. This requires a large quantity of purified antibodies which is definitely expensive. In addition to this, the technicians involved must be knowledgeable in dialysis method of conjugate purification, how to use the desalting spectra and absorbance spectra taking.
In a covalent procedure, haptens such as biotin, enzymes, fluorophores, and DIG which are commercially available are added into a protein molecule. This is done via the process of reacting activated ester and the primary amino groups. Given that the majority of amino groups sold have BSA as a stabilizer which reduces efficiency during reaction, the LinkTM conjugation system (patented) is the technology that enables preparation of good quality conjugates even in the presence of high concentration of BSA.
When it comes to non-covalent method, the procedure is much simpler and more cost effective. It involves the use of fragments associated with bridge monovalent Fab. The labeling complex is obtained from a mixer of the unconjugated primary antibodies with the monovalent Fab fragments.
In both methods, localization, observation and measurement of both the antigen and the antibodies is possible with the effectiveness and efficiency highly depending on the method and substrate used. Some of the most commonly used agents when it comes to cross linking include maleimide derivatives, glutaraldehyde and m-periodate. All these are commercially available replacing many agents that were widely used in the past.
The labels to choose from are so many largely depending on the microscope to be used and the procedure to be adopted. For a success process of antibody labeling however, there are many other factors that greatly matters. These include the level of experience of the researchers, how well the laboratory is equipped, the reagents used among others. It is however important to understand that some methods allows multiple labeling of the targeted antibodies in a single incubation and sample.
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