کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2801630 1156169 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Application of sensitive enzymeimmunoassay for determination of testosterone in blood plasma of yaks (Poephagus grunniens L.)
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی علوم غدد
پیش نمایش صفحه اول مقاله
Application of sensitive enzymeimmunoassay for determination of testosterone in blood plasma of yaks (Poephagus grunniens L.)
چکیده انگلیسی

As an alternative to radioimmunoassays, a simple, highly sensitive and quick enzymeimmunoassay (EIA) for determination of testosterone in blood plasma of yaks on microtitreplates using second antibody coating technique and testosterone–horseradish peroxidase as a label has been developed for the first time. The wells of the microtitreplate were coated with affinity-purified goat immunoglobulin (antirabbit IgG) that binds the hormone specific antibody. The EIA was carried out directly in 20 μl of plasma after 1:10 dilution with assay buffer. The testosterone standard curve ranged from 0.2 to 200 pg/well. The sensitivity of the assay was 0.20 pg/well. Testosterone standard curve in buffer showed parallelism with serially diluted yak plasma containing high endogenous testosterone. Intra- and inter-assay coefficients of variation (CV) determined using pooled plasma was found 5.24 and 8.54%, respectively.Recovery of known concentrations of added testosterone in charcoal stripped plasma was linear (r = 0.98). For biological validation of testosterone enzymeimmunoassay, the blood samples were collected from yak cows at −2 h before and thereafter at 2 h interval until 24 h. after gonadotropin releasing hormone (GnRH) administration. There was a rapid increase (p < 0.01) of luteinizing hormone (LH) and testosterone 2 and 6 h after GnRH administration. Plasma testosterone concentration in normal adult yak bulls was found to be 0.52 ± 0.09 ng/ml. In conclusion, the EIA developed in this study is simple, highly sensitive, valid and sufficiently reliable method for estimation of testosterone directly in yak plasma.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: General and Comparative Endocrinology - Volume 158, Issue 3, 15 September 2008, Pages 240–244
نویسندگان
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