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Use of graphene coated with ZnO nanocomposites for microextraction in packed syringe of carbamate pesticides from juice samples.

08:00 EDT 12th April 2019 | BioPortfolio

Summary of "Use of graphene coated with ZnO nanocomposites for microextraction in packed syringe of carbamate pesticides from juice samples."

In this work, nanocomposites of reduced graphene oxide coated with ZnO were synthesized using a hydrothermal reduction strategy. It was then used as a sorbent for microextraction in a packed syringe and its application to the extraction of carbamate pesticides from juice samples prior to HPLC detection was demonstrated. Factors affecting the enrichment efficiency of the microextraction in a packed syringe procedure were optimized, including desorption conditions, sample pH, salting-out effect, washing solution, and sample cycles. Under optimal conditions, the prepared materias exhibited excellent enrichment efficiency for carbamate pesticides. Good linearity existed in the concentration range of 0.5-200 ng mL , with correlation coefficients of 0.9991-0.9997. The limits of detection of these carbamate pesticides were in the range of 0.23-1.21 ng mL , and the average recoveries of the analytes at two spiked levels for real-sample analysis ranged from 90.5% to 104.2% with relative standard deviations of 3.6%-5.9%. This article is protected by copyright. All rights reserved.

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This article was published in the following journal.

Name: Journal of separation science
ISSN: 1615-9314
Pages:

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Medical and Biotech [MESH] Definitions

A solventless sample preparation method, invented in 1989, that uses a fused silica fiber which is coated with a stationary phase. It is used for sample cleanup before using other analytical methods.

A carbamate insecticide and parasiticide. It is a potent anticholinesterase agent belonging to the carbamate group of reversible cholinesterase inhibitors. It has a particularly low toxicity from dermal absorption and is used for control of head lice in some countries.

Specialized regions of the cell membrane composed of pits coated with a bristle covering made of the protein CLATHRIN. These pits are the entry route for macromolecules bound by cell surface receptors. The pits are then internalized into the cytoplasm to form the COATED VESICLES.

TRANSPORT VESICLES formed when cell-membrane coated pits (COATED PITS, CELL-MEMBRANE) invaginate and pinch off. The outer surface of these vesicles is covered with a lattice-like network of COP (coat protein complex) proteins, either COPI or COPII. COPI coated vesicles transport backwards from the cisternae of the GOLGI APPARATUS to the rough endoplasmic reticulum (ENDOPLASMIC RETICULUM, ROUGH), while COPII coated vesicles transport forward from the rough endoplasmic reticulum to the Golgi apparatus.

Vesicles formed when cell-membrane coated pits (COATED PITS, CELL-MEMBRANE) invaginate and pinch off. The outer surface of these vesicles is covered with a lattice-like network of the protein CLATHRIN. Shortly after formation, however, the clathrin coat is removed and the vesicles are referred to as ENDOSOMES.

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