کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7609007 1493392 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of thyroid hormones in placenta using isotope-dilution liquid chromatography quadrupole time-of-flight mass spectrometry
ترجمه فارسی عنوان
تعیین هورمونهای تیروئید در جفت با استفاده از اسپکترومتر جرمی زمانی پرواز از طریق کروماتوگرافی مایع ایزوتوپ رقیق
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
The transplacental passage of thyroid hormones (THs) is of great significance since the maternal THs are vitally important in ensuring the normal fetal development. In this paper, we determined the concentrations of seven THs, viz. L-thyroxine (T4), 3,3′,5-triiodo-l-thyronine (T3), 3,3′,5′-triiodo-l-thyronine (rT3), 3,3′-diiodo-l-thyronine (T2), 3,5-diiodo-l-thyronine (rT2), 3-iodo-l-thyronine (T1) and 3-iodothyronamine (T1AM), in placenta using isotope dilution liquid chromatography quadrupole time-of-flight mass spectrometry. We optimized the method using isotopically labeled quantification standards (13C6-T4, 13C6-T3, 13C6-rT3 and 13C6-T2) and recovery standard (13C12-T4) in combination with solid-liquid extraction, liquid-liquid extraction and solid phase extraction. The linearity was obtained in the range of 0.5-150 pg uL−1 with R2 values >0.99. The method detection limits (MDLs) ranged from 0.01 ng g−1 to 0.2 ng g−1, while the method quantification limits (MQLs) were between 0.04 ng g−1 and 0.7 ng g−1. The spike-recoveries for THs (except for T1 and T1AM) were in the range of 81.0%-112%, with a coefficient of variation (CV) of 0.5-6.2%. The intra-day CVs and inter-day CVs were 0.5%-10.3% and 1.19%-8.88%, respectively. Concentrations of the THs were 22.9-35.0 ng g−1 T4, 0.32-0.46 ng g−1 T3, 2.86-3.69 ng g−1 rT3, 0.16-0.26 ng g−1 T2, and < MDL for other THs in five human placentas, and 2.05-3.51 ng g−1 T4, 0.37-0.62 ng g−1 T3, 0.96-1.3 ng g−1 rT3, 0.07-0.13 ng g−1 T2 and < MDL for other THs in five mouse placentas. The presence of T2 was tracked in placenta for the first time. This method with improved selectivity and sensitivity allows comprehensive evaluation of TH homeostasis in research of metabolism and effects of environmental contaminant exposures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1534, 26 January 2018, Pages 85-92
نویسندگان
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