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- W2019979344 abstract "Human plasma and serum levels for 1 alpha,25-dihydroxyvitamin D were determined by a cytosol radioreceptor assay (RRA) and a radioimmunoassay (RIA). For both assays, 1.5 ml of human serum or plasma is used. Prior to RRA or RIA, extraction with benzene is performed followed by 'high-performance' liquid chromatography (HPLC) on a silica column (25 X 0.46 cm) with hexane/isopropanol (9/1 by vol), to isolate 1 alpha,25-dihydroxyvitamin D from the other vitamin D metabolites. The cytosol receptor was isolated from the intestine of healthy chickens. The antisera were raised in rabbits to 1 alpha,25-dihydroxyvitamin D3-3-hemisuccinate coupled to bovine serum albumin. The standard curves for RRA and RIA are prepared with 1 alpha,25-dihydroxyvitamin D3. 1 alpha,25-dihydroxy[3H]vitamin D3 of high spec act (158 kCi/mol) is used as tracer. The reactants are incubated for 16 h at 4 degrees C. Then, bound and free ligand are separated after the addition of dextran-coated charcoal. Both assays have a sensitivity of 2 pg/tube. The cytosol receptor and the antibodies have about the same absolute affinity for 1 alpha,25-dihydroxyvitamin D3 but the cytosol receptor has a higher relative affinity for 1 alpha,25-dihydroxyvitamin D3 (compared with other vitamin D metabolites). Reproducibility and precision are better for the RIA. The between- and within-assay CVs are 16.0% (mean = 58.7 ng/l, n = 16) and 11.2% (mean = 52.1 ng/l, n = 15), respectively, for RRA and 12.6% (mean = 61.8 ng/l, n = 27) and 7.4% (mean = 61.8 ng/l, n = 15), respectively using RIA. Reference values obtained by both assays on healthy males and healthy premenopausal females are the same for both sexes; 53.9 +/- 31.0 ng/l (n = 46) using RRA and 51.8 +/- 30.2 ng/l (n = 91) for RIA (mean +/- 2 SD)." @default.
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- W2019979344 date "1985-10-01" @default.
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- W2019979344 title "Comparison of a cytosol radioreceptor assay with a radioimmunoassay for 1,25-dihydroxyvitamin D in serum or plasma" @default.
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