کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7626609 | 1494580 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of cobalt species in nutritional supplements using ICP-OES after microwave-assisted extraction and solid-phase extraction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Determination of cobalt species in nutritional supplements using ICP-OES after microwave-assisted extraction and solid-phase extraction Determination of cobalt species in nutritional supplements using ICP-OES after microwave-assisted extraction and solid-phase extraction](/preview/png/7626609.png)
چکیده انگلیسی
Cobalt content (as vitamin B12 and inorganic cobalt) in two nutritional supplements, namely Spirulina platensis and Saccharomyces cerevisiae known as a “superfood”, has been determined using inductively coupled plasma optical emission spectrometry (ICP-OES). Several sample pre-treatment protocols have been applied and compared. Microwave-assisted acid digestion efficiently decomposed all cobalt-containing compounds, thus allowed obtaining total cobalt content in supplements examined. Vitamin B12 was extracted from the samples with acetate buffer and potassium cyanide solution exposed to mild microwave radiation for 30â¯min, and cyanocobalamin was separated from the extract by on-column solid phase extraction using C-18 modified silica bed. About 100% of cobalt species was extracted using the triple microwave-assisted extraction procedure. Total cobalt content was 20-fold greater in Spirulina tablets than the declared cobalamin content (as Co). The ICP-OES method precision was about 3% and detection limit was 1.9 and 2.7â¯ng Coâ¯mLâ1 for inorganic cobalt or cyanocobalamin, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Pharmaceutical and Biomedical Analysis - Volume 155, 5 June 2018, Pages 135-140
Journal: Journal of Pharmaceutical and Biomedical Analysis - Volume 155, 5 June 2018, Pages 135-140
نویسندگان
Magdalena Bartosiak, Krzysztof Jankowski, Jacek Giersz,