期刊
JOURNAL OF SEPARATION SCIENCE
卷 34, 期 11, 页码 1317-1325出版社
WILEY-BLACKWELL
DOI: 10.1002/jssc.201100096
关键词
New polymeric phases; Pesticide residues; Stir bar sorptive extraction; Sugarcane juice
资金
- CAPES
- CNPq
- Fapesp [07/03844-4, 05/59360-0]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [05/59360-0, 07/03844-4] Funding Source: FAPESP
In this article, a novel polydimethylsiloxane/activated carbon (PDMS-ACB) material is proposed as a new polymeric phase for stir bar sorptive extraction (SBSE). The PDMS-ACB stir bar, assembled using a simple Teflon (R)/glass capillary mold, demonstrated remarkable stability and resistance to organic solvents for more than 150 extractions. The SBSE bar has a diameter of 2.36 mm and a length of 2.2 cm and is prepared to contain 92 mu L of polymer coating. This new PDMS-ACB bar was evaluated for its ability to determine the quantity of pesticides in sugarcane juice samples by performing liquid desorption (LD) in 200 mu L of ethyl acetate and analyzing the solvent through gas chromatography coupled with mass spectrometry (GC-MS). A fractional factorial design was used to evaluate the main parameters involved in the extraction procedure. Then, a central composite design with a star configuration was used to optimize the significant extraction parameters. The method used demonstrated a limit of quantification (LOQ) of 0.5-40 mu g/L, depending on the analyte detected; the amount of recovery varied from 0.18 to 49.50%, and the intraday precision ranged from 0.072 to 8.40%. The method was used in the analysis of real sugarcane juice samples commercially available in local markets.
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