Abstract
The conjugation of enzymes, fluorescent or radioactive labels, cross-linkers and other moieties to antibodies is a commonly performed procedure in biochemical research. Using reduced disulphides, conjugation can be an inconvenient, multistep, time- and material-consuming process. We have developed a reduction technique based on UV irradiation, which lacks these drawbacks. Antibodies are irradiated in a sealed vial for a few minutes by a common laboratory UV source in the presence of stannous ions, following the depletion of atmospheric oxygen. The preparation may subsequently be conjugated with thiol-reactive probes such as maleimide derivatives, with no need for any prior purification or concentration. This simple, rapid and effective reduction and conjugation process results in a fully functional immunoglobulin conjugate that can be used for a variety of biochemical applications.
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