کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1211168 | 1493754 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimization of a procedure for the selective isolation of some powerful aroma thiols
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This paper deals with the isolation properties of four relevant wine mercaptans in two different separation systems and with the subsequent development, optimization and validation of an analytical procedure for their quantitative determination. 4-Methyl-4-mercaptopentanone (4M4MP), 2-furanmethanethiol (FFT), 3-mercaptohexanol (3MH) and 3-mercaptohexyl acetate (AMH) can be quantitatively extracted from 200 ml of wine in a bed packed with 1 g of LiChrolut EN resins. Fatty acids and diverse interfering compounds are removed by rinsing with an aqueous solution with a 40% of methanol and buffered at pH 7.2 with α,α,α-tris-(hydroxymethyl)-aminomethane (TRIS) 0.2 M. Mercaptans can be further isolated by extraction with an aqueous solution of 1 mM p-hydroxymercury benzoate. Best results were achieved with an extraction with a solution at pH 10.7 with 0.2 M 4-(2-hydroxyethyl)piperazine-1-ethanesulfonic acid (HEPES), further acidification to pH 7.5, release of thiols by the addition of dithioerythritol and extraction with 2à0.75 ml dichloromethane. The extract is concentrated to 200 and 20 μl are finally injected in a gas chromatograph-ion trap mass spectrometric system. Method detection limits are 0.8, 6, 15 and 5 ng lâ1 for 4M4MP, FFT, MH and AMH, respectively. The recovery in the sample pre-treatment was 76, 45, 75 and 95%, respectively. Repeatability and linearity are also satisfactory. Different critical aspects, such as the effect of air or the evaporation of the extract were also studied.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1143, Issues 1â2, 2 March 2007, Pages 190-198
Journal: Journal of Chromatography A - Volume 1143, Issues 1â2, 2 March 2007, Pages 190-198
نویسندگان
Vicente Ferreira, Natalia OrtÃn, Juan F. Cacho,