Rapid determination of atrazine in apple juice using molecularly imprinted polymers coupled with gold nanoparticles-colorimetric/SERS dual chemosensor
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Molecularly imprinted polymer
Solid phase extraction
A molecularly imprinted polymer (MIP), prepared around a cotinine template, has been synthesized. The feasibility of using the polymer for solid-phase extraction (SPE) of cotinine from biological samples has been investigated. The results show that cotinine can be quantitatively retained and eluted from the polymer. Experiments with human urine samples indicate that clean target analyte is obtained for HPLC with UV detection using the protocol.
Molecularly imprinted polymer
Cotinine
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Molecular imprinting
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Molecularly imprinted polymer
Solid phase extraction
Molecular imprinting
Cartridge
Precipitation polymerization
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Solid phase extraction
Molecular imprinting
Molecularly imprinted polymer
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To prepare solid phase extraction(SPE) column of molecularly imprinted polymer(MIP) which can present a specific recognition to Nipagin A.Nipagin A MIP was synhesized by bulk polymerization,SPE capability was characterized through equilibrium adsorption experiment and SPE experiment.Eye drops was determined by UV method.The adsorption capability of Nipagin A MIP was stronger than that of Non-MIP.The extraction efficiency by MIP-SPE was 95.1%.The Nipagin A content in eye drops was 0.0265%.Nipagin A MIP presented a good specific recognition to Nipagin A and SPE column showed good selectivity.It can be applied to drug,food and cosmetics test fields.
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Solid phase extraction
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Molecularly imprinted polymer
Solid phase extraction
Molecular imprinting
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Abstract Polymers imprinted with cefathiamidine were synthesized using 4‐vinylpyridine as an interacting monomer, ethyleneglycol dimethacrylate as a cross‐linker, and methanol and toluene as a porogen. The polymer was used as solid‐phase extraction sorbent. One‐hundred percent of the cefathiamidine was bound to the polymer and the target can be eluted efficiently only by 1 ml eluant. Human plasma and serum samples were preconcentrated by the molecularly imprinted solid‐phase extraction prior to analysis by HPLC. Recoveries of up to 98% were achieved. The molecularly imprinted solid phase extraction column can be used repeatedly.
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Molecularly imprinted polymer
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An analytical method for determination of Atrazine in water by solid-phase extraction and liquid chromatography (SPE-HPLC) was developed, with linear range of 0.10~2.00mg/L and detection limit of 1.0μg/L for Atrazine. The recovery of Atrazine was 94% in tap water. Results showed that the proposed method is effective for the determination of Atrazine in water.
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Abstract In this paper we describe, for the first time, a molecularly imprinted polymer (MIP) for the antibiotic amoxicillin (AMX), synthesised by a noncovalent molecular imprinting approach and used to extract AMX selectively from urine samples. The MIP was applied as a molecularly selective sorbent in molecularly imprinted SPE (MISPE) in an off‐line mode, where it showed useful cross‐selectivity for a structurally related antibiotic, cephalexin (CPX). By using a MISPE protocol, the MIP was able to selectively extract both AMX and CFX from 5 mL of water spiked with 10 mg/L with recoveries of 75 and 78% for AMX and CFX, respectively. When applied to real samples (urine) at clinically relevant concentrations, recoveries from 2 mL of human urine spiked with 20 mg/L decreased slightly to 65 and 63% for AMX and CFX, respectively. To demonstrate further the selectivity of the MIP obtained, a comparison with commercially available SPE cartridges was performed. Improvements in the retention of both AMX and CFX on the MIP were obtained relative to the commercially available cartridges, and the MISPE extracts were considerably cleaner, due to molecularly selective analyte binding by the MIP.
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Solid-phase extraction (SPE) is a common sample preparation method that involves the interaction between an aqueous sample and a solid phase (or sorbent). An important variable in any SPE system is the choice of sorbent. Generally, SPE sorbents can be divided into two generic classes: silica-based sorbents and unmodified substrates. Irrespective of SPE format, the method of operation is the same and can be divided into several steps. Each step is characterized by the nature and type of solvent used, which in turn, is dependent upon the characteristics of the sorbent and the sample. The steps are explained in the context of a reversed-phase SPE system using a C18 sorbent, and with a vacuum manifold applied. The general methodology to be followed for off-line SPE is described using generic examples with emphasis on reversed phase, normal phase, ion exchange, and mixed mode systems.
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