Development of selective preconcentration/clean-up method for imidazolinone herbicides determination in natural water and rice samples by HPLC-PAD using an imazethapyr imprinted poly(vinylimidazole-TRIM)

Author(s)

Teixeira Tarley, Cesar Ricardo ^{[1, 2]} ; Cajamarca Suquila, Fabio Antonio ^[2] ; Casarin, Juliana ^[3] ; Goncalves Junior, Affonso Celso ^[3] ; Segatelli, Mariana Gava ^[2]

Affiliation

^[1] Univ Estadual Campinas Unicamp, Inst Nacl Ciencia & Tecnol INCT Bioanalit, Inst Quim, Dept Quim Analit, BR-13083970 Campinas, SP - Brazil

^[2] Univ Estadual Londrina UEL, Dept Quim, Rod Celso Garcia Cid, PR 445 Km 380, Campus Univ, BR-86051990 Londrina, PR - Brazil

^[3] Univ Estadual Oeste Parana, Ctr Ciencias Agr, BR-85960000 Marechal Candido Rodondo, PR - Brazil

• Document type: Journal article
• Source: Food Chemistry; v. 334, JAN 1 2021.
• Web of Science Citations: 6

Abstract

The development of a novel molecularly imprinted solid-phase extraction (MISPE) method for simultaneous preconcentration of imazapyr (IMP), imazapic (IMZ) and imazethapyr (IMT) with determination by HPLC-PAD (High performance liquid chromatography - photodiode-array detector) is proposed. The polymer synthesis was performed using imazethapyr as template molecule and 1-vinylimidazole as functional monomer. The method is based on preconcentration of 100.0 mL of sample through 200.0 mg of molecularly imprinted poly(vinylimidazole-TRIM) (MIP-1VN) at pH 4.0, followed by elution with 2.0 mL of MeOH:CH2Cl2:HAc (34:62:4, v/v). The range of analytical curve (0.29-200.0, 0.21-200.0 and 0.15-200.0 mu g L-1), limits of detection (0.09, 0.06 and 0.04 mu g L-1) and preconcentration factors (92, 96 and 98) determined for the herbicides, IMP, IMZ and IMT, respectively, were greatly superior when compared with those ones obtained with commercial adsorbents. The analytical method was successfully applied to spiked surface water and rice samples with good results of recovery values (86-107%). (AU)

• FAPESP's process: 14/50867-3 - INCT 2014: National Institute of Science and Technology in Bioanalysis
• Grantee: Marco Aurelio Zezzi Arruda
• Support Opportunities: Research Projects - Thematic Grants