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A grant was awarded to TNO-PML to develop immunochemical monitoring systems for the detection of DNA-HD and Protein-HD adducts in humans following exposure to HD. TNO-PML has been using 35S-HD to prepare adducts for their assays, which have inherent shortcomings that limit detection sensitivity. An experimental batch of 14C-HD-DNA adducts was prepared in an attempt to increase the assay sensitivity. Double - and single-stranded purified calf thymus DNA preparations were reacted with 142, 14.2 and 1.42 uM of 14C-HD under aqueousfree conditions. The 14C-HD-DNA adducts were isolated at -20C in 75% ethanol solution and freed of HD agent and organic solvents (i.e., acetone and alcohol). The 14C-HD-DNA adducts in aqueous buffer were analyzed for specific activity and purity. The ds-DNA-HD adducts were uncontaminated, but the ss-DNA-HD adducts were initially slightly contaminated with alcohol.