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Microwave-assisted extraction and high-throughput monolithic-polymer-based micro-solid-phase extraction of organophosphorus, triazole, and organochlorine residues in apple.

Journal of separation science (2015-11-29)
Habib Bagheri, Ali Es'haghi, Ali Es-Haghi, Fatemeh Basiripour
ABSTRACT

A high-throughput micro-solid-phase extraction device based on a 96-well plate was constructed and applied to the determination of pesticide residues in various apple samples. Butyl methacrylate and ethylene glycol dimethacrylate were copolymerized as a monolithic polymer and placed in the cylindrically shaped stainless-steel meshes of 96-micro-solid-phase extraction device and used as an extracting unit. Before the micro-solid-phase extraction, microwave-assisted extraction was employed to facilitate the transfer of the pesticide residues from the apple matrix to liquid media. Then, 1 mL of the aquatic samples was transferred into the 96-well plate and the 96-micro-solid-phase extraction device was applied for the extraction of the selected pesticides. Influential parameters, such as sorbent-to-sorbent reproducibility, microwave-assisted extraction time, ionic strength and micro-solid-phase extraction time, were optimized. The limits of quantitation were below 120 μg/kg, which are lower than the maximum residue limits. The developed method was successfully implemented for the extraction and determination of the selected pesticides from 20 different apple samples gathered from local markets. Phosalone was identified and quantified at the concentration level of 147 (±16.4) μg/kg in one of the samples.

MATERIALS
Product Number
Brand
Product Description

Supelco
SPME fiber assortment kit 5, needle size 23 ga, for use with autosampler
Supelco
SPME fiber assembly, Carbowax-Polyethylene Glycol (PEG) Coating, needle size 23 ga, df 60 μm (PEG), for use with autosampler
Supelco
SPME fiber assembly, Carbowax-Polyethylene Glycol (PEG) Coating, needle size 23 ga, df 60 μm (PEG), metal alloy fiber, for use with manual holder
Supelco
IonSense® PDMS/DVB SPE-it Tips, pkg of 96 ea
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SPME LC Tips, C18, tray of 96 ea
Supelco
SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), df 65 μm (PDMS/DVB), for use with autosampler, needle size 23 ga, metal alloy fiber
Supelco
SPME fiber assortment kit 1, for use with autosampler, needle size 23 ga
Supelco
SPME fiber assortment kit 4, for use with autosampler, needle size 23 ga
Supelco
SPME fiber assortment kit 2, for use with autosampler, size 24 ga
Supelco
SPME fiber assortment kit 4, for use with manual holder, size 24 ga
Supelco
SPME fiber assortment kit 1, for use with manual holder, needle size 24 ga
Supelco
SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), df 65 μm (PDMS/DVB), needle size 24 ga, for use with autosampler
Supelco
SPME StableFlex fiber assortment kit, for use with manual holder
Supelco
SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), df 65 μm (PDMS/DVB), needle size 24 ga, StableFlex, for use with autosampler
Supelco
SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), df 65 μm (PDMS/DVB), needle size 24 ga, for use with manual holder
Supelco
SPME fiber assortment kit 2, for use with manual holder, needle size 24 ga
Supelco
SPME fiber assortment kit 4, for use with autosampler, size 24 ga
Supelco
SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), df 65 μm (PDMS/DVB), needle size 24 ga, StableFlex, for use with manual holder
Supelco
SPME fiber assortment kit 1, for use with autosampler, needle size 24 ga
Supelco
SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), fused silica fiber, df 65 μm (PDMS/DVB), for use with manual holder, needle size 23 ga
Supelco
SPME StableFlex fiber assortment kit, for use with autosampler, needle size 24 ga
Supelco
SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), df 65 μm (PDMS/DVB), for use with autosampler, needle size 23 ga
Supelco
SPME StableFlex fiber assortment kit, needle size 23 ga, for use with autosampler
Supelco
SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), df 65 μm (PDMS/DVB), needle size 23 ga, PDMS/DVB StableFlex, for use with autosampler
Supelco
SPME fiber assortment kit 2, for use with autosampler, needle size 23 ga
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 7 μm (PDMS), needle size 24 ga, for use with autosampler
Supelco
SPME Portable Field Sampler, coating CAR/PDMS
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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), df 85 μm (CAR/PDMS), needle size 24 ga, StableFlex, for use with autosampler
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SPME fiber assembly Polydimethylsiloxane (PDMS), df 100 μm (PDMS), for use with manual holder, needle size 23 ga
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SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), needle size 23 ga, StableFlex, for use with manual holder or autosampler, fiber L 2 cm