کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1198708 1493484 2016 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Three-step stacking by field-enhanced sample injection, sweeping, and micelle to solvent stacking in capillary electrophoresis: Anionic analytes
ترجمه فارسی عنوان
جمع کردن سه مرحله ای با تزریق نمونه های زمینه ای، جارو، و میسل به جمع آوری حلال در الکتروفورز مویرگی: آنالیز های آنیونی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• Three-step stacking of anionic analytes in cationic polymer coated CZE.
• Sequential stacking by field-enhanced sample injection (FESI), sweeping, and micelle to solvent stacking.
• Sensitivity enhancement factors (SEFs) of three-step stacking CZE was 146–954.
• SEFs of three-step stacking CZE were 6–32× better than the SEFs of FESI-CZE.
• LODs (S/N = 3) were from 6.6–13.2 ng/mL.

Three-step stacking by field-enhanced sample injection (FESI), sweeping, and micelle to solvent stacking (MSS) in co-EOF capillary zone electrophoresis (CZE) is presented for anionic analytes. Long FESI produced an overloaded stacked zone of analytes (four model penicillins). Sweeping of the FESI zone was by electrokinetic injection of cetyltrimethylammonium bromide (CTAB) micelles. MSS was by short injection of 60% methanol that released the swept analytes from CTAB micelles. The sensitivity enhancement factors were 146–279 and 519–954 for conductivity ratio of 10 and 100, respectively. The SEF enhancement factors (factor = SEF from three-step stacking/SEF from FESI) were 16–32 and 6–10, correspondingly. The LODs were between 6.6–13.2 ng/mL, repeatability (intraday and interday) was %RSD ≤ 5.4%, and linearity was R2 ≥ 0.998. Application to real sample was investigated using fortified plasma after liquid–liquid extraction.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1442, 15 April 2016, Pages 140–143
نویسندگان
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