Development of a new stir bar sorptive extraction coating and its application for the determination of six pesticides in sugarcane juice

Author(s)

Barletta, Juliana Y. ^[1] ; de Lima Gomes, Paulo C. F. ^[1] ; dos Santos-Neto, Alvaro J. ^[1] ; Lancas, Fernando M. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF SEPARATION SCIENCE; v. 34, n. 11, p. 1317-1325, JUN 2011.
• Web of Science Citations: 20

Abstract

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. (AU)

• FAPESP's process: 05/59360-0 - Miniaturization of analytical instrumentation for separation techniques: sample preparation and printing of result
• Grantee: Fernando Mauro Lanças
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 07/03844-4 - Simultaneous analysis of multi-residue antibiotics in water and sediments by headspace bar sorptive extraction with in situ derivatization coupled to GC / MS
• Grantee: Paulo Clairmont Feitosa de Lima Gomes
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)