کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1247100 | 969798 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of piceid by photochemically induced fluorescence and second-derivative
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
trans-Piceid itself is weakly fluorescent, but the fluorescence signal (λexc/em = 260/361 nm) is greatly enhanced by UV-irradiation of its hydroethanolic solutions. Employing the photoinduced emission signal at 361 nm or the amplitude of the second-derivative-photoinduced emission spectrum, between 353 and 361 nm, a linear relation is found in the assayed range 5.7-31.4 ng mLâ1 of trans-piceid and limits of detection of 1.7 and 2.1 ng mLâ1, respectively, are obtained. A previous liquid-liquid extraction is necessary for the determination of piceid in wine. Experimental design (Central Composite Design) together with the Response Surface Methodology have been used to find optimum conditions for the extraction procedure. For this purpose, the difference between the photoinduced-fluorescence signal (λexc/em = 260/361 nm) of the aqueous phase, before and after being extracted, has been considered as Response Function. A tartrate buffer (pH 5.0) concentration of 0.15 mol Lâ1 and a phase ratio of 1 are determined as optimum conditions. The amplitude of the second-derivative-emission spectrum, corresponding to the evaporated and re-dissolved organic phase, between 353 and 361 nm has been employed as analytical signal. Standard addition method has been applied to the analysis of piceid in different wine samples under optimum conditions. Results of wine analysis have been satisfactorily validated by HPLC.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Talanta - Volume 74, Issue 4, 15 January 2008, Pages 675-682
Journal: Talanta - Volume 74, Issue 4, 15 January 2008, Pages 675-682
نویسندگان
Isabel Durán Merás, Teresa Galeano DÃaz, Diego Airado RodrÃguez,