Analytical Chemistry,
Journal Year:
2023,
Volume and Issue:
95(39), P. 14582 - 14591
Published: Sept. 18, 2023
Cyclodextrin
polymers
(CDPs)
are
promising
next-generation
adsorbents
in
water
purification
technologies.
The
selectivity
of
the
polymer
derivate
cross-linked
with
tetrafluoroterephthalonitrile
(TFN-CDP)
for
nonionic
and
cationic
micropollutants
(MPs)
over
dissolved
organic
matter
(DOM)
renders
adsorbent
also
attractive
many
analytical
applications.
molecular
drivers
observed
are,
nonetheless,
not
yet
fully
understood.
To
provide
new
insights
into
sorption
mechanism,
we
(i)
synthesized
TFN-CDPs
different
cavity
sizes
(α-,
β-,
γ-CDP);
(ii)
assessed
their
extraction
efficiencies
selected
MPs
competition
DOM
size
fractions
(<1,
1-3,
3-10,
>10
kDa)
to
test
size-selectivity;
(iii)
performed
nontargeted,
ultrahigh
resolution
Fourier
transform
ion
cyclotron
resonance
mass
spectrometry
analysis
on
CDP-extracted
compounds
(<1
probe
sorbate
properties
governing
selective
sorption.
First,
no
evidence
size-selectivity
was
obtained
through
either
CD
or
two
independent
approaches
(iii).
Second,
found
a
dominant
impact
oxygenation
polarity
MPs,
respectively,
relatively
oxygen-poor/nonpolar
molecules
favorably
retained
all
α-,
γ-CDP.
Third,
our
data
indicates
exclusion
an
anionic
matrix,
such
as
carboxylic
acids,
but
preferential
nitrogen-bearing
DOM,
pointing
at
repulsive
forces
negatively
charged
cross-linker
likely
reason.
Therefore,
ascribe
TFN-CDP's
nonpolar
electrostatic
interactions
between
MPs/DOM
building
blocks.
These
can
further
aid
optimization
efficient
sorbent
design
environmental
Current Pharmaceutical Analysis,
Journal Year:
2024,
Volume and Issue:
20(2), P. 152 - 159
Published: Feb. 1, 2024
Background:
α-phenylethanol
and
its
derivatives
are
important
intermediates
for
the
synthesis
of
a
variety
chiral
drugs.
Methods:
The
interaction
mechanism
two
enantiomers
with
β-cyclodextrin
(β-CD)
was
investigated
using
1H-NMR
ROESY.
loading
β-CD
as
host
drug
intermediate
guest
high-resolution
NMR
in
D2O
quantum
chemical
calculations.
Results:
results
showed
that
both
were
able
to
enter
into
hydrophobic
cavity
undergo
enantiospecific
interactions,
while
combination
2D
ROESY
calculations
benzene
ring
R
S
α-
phenylethanol
inserted
toward
small-port
end.
However,
most
stable
poses
different,
so
S-enantiomer
more
inclined
position
end
than
R-enantiomer,
which
reflected
differently
signals
Conclusion:
can
enantioselectively
recognize
enantiomers,
method
is
direct
powerful
tool
recognition
process
research.
Chemosphere,
Journal Year:
2024,
Volume and Issue:
370, P. 144010 - 144010
Published: Dec. 24, 2024
Many
processes
can
contribute
to
the
attenuation
of
frequently
detected
and
toxic
herbicides
atrazine
metolachlor
in
surface
water,
including
photodegradation.
Multi-element
compound-specific
isotope
analysis
has
potential
decipher
between
these
different
degradation
pathways
as
Cl
is
a
promising
tool
for
both
pathway
identification
sensitive
indicator
metolachlor.
In
this
study,
photodegradation
experiments
were
conducted
under
simulated
sunlight
buffered
solutions
(direct
photodegradation)
with
nitrate
(indirect
by
OH
radicals)
determine
kinetics,
transformation
products
fractionation
C,
N
first
time
Cl.
For
metolachlor,
C-Cl
dual
slope
(Λ
Analytical Chemistry,
Journal Year:
2023,
Volume and Issue:
95(39), P. 14582 - 14591
Published: Sept. 18, 2023
Cyclodextrin
polymers
(CDPs)
are
promising
next-generation
adsorbents
in
water
purification
technologies.
The
selectivity
of
the
polymer
derivate
cross-linked
with
tetrafluoroterephthalonitrile
(TFN-CDP)
for
nonionic
and
cationic
micropollutants
(MPs)
over
dissolved
organic
matter
(DOM)
renders
adsorbent
also
attractive
many
analytical
applications.
molecular
drivers
observed
are,
nonetheless,
not
yet
fully
understood.
To
provide
new
insights
into
sorption
mechanism,
we
(i)
synthesized
TFN-CDPs
different
cavity
sizes
(α-,
β-,
γ-CDP);
(ii)
assessed
their
extraction
efficiencies
selected
MPs
competition
DOM
size
fractions
(<1,
1-3,
3-10,
>10
kDa)
to
test
size-selectivity;
(iii)
performed
nontargeted,
ultrahigh
resolution
Fourier
transform
ion
cyclotron
resonance
mass
spectrometry
analysis
on
CDP-extracted
compounds
(<1
probe
sorbate
properties
governing
selective
sorption.
First,
no
evidence
size-selectivity
was
obtained
through
either
CD
or
two
independent
approaches
(iii).
Second,
found
a
dominant
impact
oxygenation
polarity
MPs,
respectively,
relatively
oxygen-poor/nonpolar
molecules
favorably
retained
all
α-,
γ-CDP.
Third,
our
data
indicates
exclusion
an
anionic
matrix,
such
as
carboxylic
acids,
but
preferential
nitrogen-bearing
DOM,
pointing
at
repulsive
forces
negatively
charged
cross-linker
likely
reason.
Therefore,
ascribe
TFN-CDP's
nonpolar
electrostatic
interactions
between
MPs/DOM
building
blocks.
These
can
further
aid
optimization
efficient
sorbent
design
environmental
