Cross-correlated relaxation rates โซ are commonly obtained from constant time experiments by measuring the effect of the desired cross-correlated relaxation on an appropriate coherence during the constant time T. These measurements are affected by systematic errors, which derive from undesired cross-
Matrix effects in the radioimmunoassay of estradiol and testosterone in plasma of veal calves and how to avoid them
โ Scribed by L. Hendriks; B. Gielen; G. Pottie; V. Haesen; S. Bagyary; J. Raus
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 587 KB
- Volume
- 275
- Category
- Article
- ISSN
- 0003-2670
No coin nor oath required. For personal study only.
โฆ Synopsis
W~thm the scope of the control of the dIegal use of naturab occurrmg steroids m veal calves, an evaluation was made of two commercmlly avadable luts for the determmafion of estrad~ol-17/3 and testosterone m plasma Four rahonnmunoassay (RIA) luts, two mth and two mthout extra&on, used m human medicme were evaluated and eventually adapted for the assay of bovme plasma samples On measurmg estrad~ol-17/I lower values were obtained when the plasma samples were assayed without extration (*%RIA)
This difference was due to a plasma matnx effect which could be avolded by usmg either the extraction method t3H-RL4) or by dlssohmg estradlol standards m bovme plasma mstead of human serum T~s plasma matnx effect did not mterfere as much when testosterone levels were measured However, the best method for thi determmatlon of both steroids m bovme plasma was RIA wnth extrar%on (3H-RL4) &ywor& Immunoassay, Radmchemlcal methods, Anabohc stends, Estradlol, Plasma, Testosterone, Veal calves After the illegal use of stdbenes as growth promoters and their ehmmatlon by rlgd law enforcement, the use of anabohc steroids as growth Correspondnce to J Raus, Dr Wdlems Instituut, Umvew-
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