Magnetic “one-step” quick, easy, cheap, effective, rugged and safe method for the fast determination of pesticide residues in freshly squeezed juice

Zheng, Hao-Bo; Ding, Jun; Zheng, Shu-Jian; Yu, Quan; Yuan, Bi-Feng; Feng, Yun

doi:10.1016/j.chroma.2015.04.021

Cited by 31 publications

(10 citation statements)

References 25 publications

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“…The magnetic materials are known to have a tendency to aggregate and form large entities in solutions based on the mechanism of “aggregate warp” . When MIP was dispersed evenly in DMF, along with the aggregation, it can be magnetically separated in the presence of the MNPs, MNPs should be wrapped into MIP.…”

Section: Resultsmentioning

confidence: 99%

Magnetic molecularly imprinted polymers for the determination of β‐agonist residues in milk by ultra high performance liquid chromatography with tandem mass spectrometry

Liu¹,

Xin²,

Lin³

et al. 2016

J of Separation Science

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A simple, accurate, and highly sensitive analytical method was developed in this study for the determination of nine β-agonists in milk. In this method, a new magnetic adsorbent of molecularly imprinted polymers/magnetic nanoparticles prepared by simple physical blending was adopted, which enabled magnetic solid-phase extraction. Thus, the resultant material can be separated from the solvent rapidly and conveniently by a magnet. Two kinds of molecularly imprinted polymer/magnetic nanoparticles materials were fabricated, and the characteristics of materials such as the ratio, pH, amount, desorption, and regeneration were investigated. The analytes were quantified by ultra high performance liquid chromatography coupled to an electrospray ionization tandem mass spectrometer operating in multiple reaction monitoring modes. The detection limit of the method was 0.003-0.3 μg/L, and the detection capability was 0.01-0.3 μg/L. The recoveries of these compounds were 65.7-114% at three spiked levels. Reproducibility represented by relative standard deviation was 11.2% or less. The method was successfully applied to the screening of real samples obtained from local markets and confirmation of the suspected target analytes.

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Section: Resultsmentioning

confidence: 99%

Magnetic molecularly imprinted polymers for the determination of β‐agonist residues in milk by ultra high performance liquid chromatography with tandem mass spectrometry

Liu¹,

Xin²,

Lin³

et al. 2016

J of Separation Science

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“…In order to improve the QuECh-ERS method, a variety of effective adsorbents mustbe imperatively developed. It was reported that modified graphene adsorbents, functionalized carbon nanotubes, and magnetic adsorbents were used in the QuEChERS method [27,28]. Furthermore, some companies (Agilent, United Chemical) introduced commercialized novel materials for interference removal from food, environment, and Chinese medicine [29].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous quantification of three tropane alkaloids in goji berries by cleanup of the graphene/hexagonal boron nitride hybrids and ultra‐high‐performance liquid chromatography tandem mass spectrometry

Zhao

Shi

2020

J of Separation Science

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A modified quick, easy, cheap, effective, rugged and safe method was established for simultaneous determination of atropine, anisodamine, and scopolamine in goji berries by using ultra‐high‐performance liquid chromatography with tandem mass spectrometry. The graphene/hexagonal boron nitride hybrids were prepared and first applied as a cleanup adsorbent. Compared to classical cleanup adsorbent (C18), the graphene/hexagonal boron nitride hybrids as adsorbent had better extraction efficiency for the detection of analytes. Under the optimal conditions, the proposed analytical method achieved satisfactory linearity (R2 > 0.995), and obtained desirable recoveries ranged from 77.4 to 94.0% with the relative standard deviation of 1.2–6.1% at the concentration levels of 3.2–13.4 µg/kg. The limits of quantitation of atropine, anisodamine, and scopolamine were, respectively, 3.2, 4.6, and 4.5 µg/kg with linearity ranged from 3.2 to 25.4 µg/kg. The modified quick, easy, cheap, effective, rugged, and safe sample preparation with ultra‐high‐performance liquid chromatography and tandem mass spectrometry method was successfully applied to evaluate the safety of goji berries collected from 30 plant areas in China, suggesting its applicability and suitability for the routine analysis of three tropane alkaloids in goji berries.

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“…Many variations and improvements of the original method have taken place through the years such as use of buffers [7]; substitution of NH 4 HCO 2 instead of MgSO 4 /NaCl for initial phase separation [8]; addition or substitution of other d-SPE (such as chitin [9], CaCl 2 [10], zirconium oxide [8,11], C18/zirconium oxide [8–11], or carbons [8,12,13]); testing or use of other extraction solvents such as ethyl acetate [14]; evaporative concentration into toluene [15,16]; shortening the method to a single step [17]; use of in-vial filtration [8,18]; use of low pressure GC–MS [18,19]; automated mini-column SPE [20]; and detection by LC–MS methods [1]. …”

Section: Introductionmentioning

confidence: 99%

Cold-induced aqueous acetonitrile phase separation: A salt-free way to begin quick, easy, cheap, effective, rugged, safe

Shao

Agar

Giese

2017

Journal of Chromatography A

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Cooling a 1:1 (v/v) solution of acetonitrile and water at −16° C is known to result in two clear phases. We will refer to this event as “cold-induced aqueous acetonitrile phase separation (CIPS)”. On a molar basis, acetonitrile is 71.7% and 13.6% in the upper and lower phases, respectively, in our study. The phase separation proceeds as a descending cloud of microdroplets. At the convenient temperature (typical freezer) employed here the lower phase is rather resistant to solidification, although it emerges from the freezer as a solid if various insoluble matter is present at the outset. In a preliminary way, we replaced the initial (salting-out) step of a representative QuEChERS procedure with CIPS, applying this modified procedure (“CIPS-QuEChERS”) to a homogenate of salmon (and partly to beef). Three phases resulted, where only the upper, acetonitrile-rich phase is a liquid (that is completely clear). The middle phase comprises ice and precipitated lipids, while the lower phase is the residual matrix of undissolved salmon or meat. Treating the upper phase from salmon, after isolation, with anhydrous MgSO4 and C18-Si (typical QuEChERS dispersive solid phase extraction sorbents), and injecting into a GC–MS in a nontargeted mode, gives two-fold more preliminary hits for chemicals, and also number of spiked pesticides recovered, relative to that from a comparable QuEChERS method. In part, this is because of much higher background signals in the latter case. Further study of CIPS-QuEChERS is encouraged, including taking advantage of other QuERChERS conditions.

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Magnetic “one-step” quick, easy, cheap, effective, rugged and safe method for the fast determination of pesticide residues in freshly squeezed juice

Cited by 31 publications

References 25 publications

Magnetic molecularly imprinted polymers for the determination of β‐agonist residues in milk by ultra high performance liquid chromatography with tandem mass spectrometry

Magnetic molecularly imprinted polymers for the determination of β‐agonist residues in milk by ultra high performance liquid chromatography with tandem mass spectrometry

Simultaneous quantification of three tropane alkaloids in goji berries by cleanup of the graphene/hexagonal boron nitride hybrids and ultra‐high‐performance liquid chromatography tandem mass spectrometry

Cold-induced aqueous acetonitrile phase separation: A salt-free way to begin quick, easy, cheap, effective, rugged, safe

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