Stir bar sorptive dispersive microextraction mediated by magnetic nanoparticles
We
all are familiar with stir bar sorptive extraction (SBSE) and dispersive
methodologies in this context. The advantages of both techniques are also well
known and a deep research is being carried out to characterize new sorbent
phases which improve the efficiency and open up the application field of these
microextraction techniques.
Research
teams from the University of Valencia at Spain and Ioannina at Greece have
joined their deep knowledge in dispersive techniques to bring us a very elegant
combination of stir bar sorptive dispersive microextraction mediated by
magnetic nanoparticles (SBSEDµE) (1). The main advantage of the proposed
methodology is clear as it permits the use of a wider variety of sorbent phases
while maintaining the advantages of agitation and simplicity of sorbent
recovery provided by the magnetic element.
The
sorbent is either coated on the stir bar or dispersed in the
sample matrix depending on the stirring speed. The general procedure is shown in Figure 1. In a first step, the bar containing the attached magnetic nanoparticles (MNPs) is introduced
into the sample. Then, the bar is stirred at high velocities inducing the detachment
of the MNPs from the bar into the sample, the extraction of the analytes taking
place. The continuous reduction of the stirring velocity induces again the
attachment of the MNPs on the bar simplifying the final elution step.
The
analytical problem selected for the evaluation of this novel approach is the
determination of organic UV filters in seawaters. For this aim, oleic
acid-coated cobalt ferrite MNPs was selected as sorbent material. They have
carried out a rigorous study to properly characterize and evaluate the potential
of SBSEDµE.
From
this blog, we congratulate our colleagues for being the first in envisage the
potential of the direct combination of these two microextraction concepts. As usual,
the simplicity of the approach is its key strength.
Enjoy
the reading!!
Reference:
(1)
Development of stir bar sorptive-dispersive microextraction mediated by
magnetic nanoparticles and its analytical application to the determination of
hydrophobic organic compounds in aqueous media. Link to the article
I wonder what's the advantages of the proposed SBSEDµE, when compared with magnetic solid phase extraction(MSPE).
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