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A radioimmunoassay was developed for the determination of desmosine. Desmosine conjugated to albumin was injected into rabbits which developed useful titers of serum antibodies after six months. A radioactive probe was prepared with desmosine using [125I]-Bolton-Hunter reagent. Bound desmosine was separated from free desmosine by cellulose acetate filter binding. The sensitivity of the assay is 1-50 picomoles of desmosine. The antibody is highly selective for desmosine, reacting less than 1% with other known crosslinks. Some prepurification may be necessary with complex samples which contain trace amounts of elastin peptides.
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King et al. (1980) studied this question.
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