Analytical Chemistry,
Год журнала:
2024,
Номер
96(36), С. 14706 - 14713
Опубликована: Авг. 29, 2024
Concerns
regarding
the
hazard
of
carcinogenic
ethyl
carbamate
(EC)
have
driven
attempts
to
exploit
efficient,
timely,
straightforward,
and
economic
assays
for
warning
early
food
safety.
Here,
we
proposed
a
novel
molecularly
imprinted
polymer
Co@MOF-MIP,
with
high
peroxidase
(POD)-like
activity
bright
blue
fluorescence
emission,
develop
versatile
visual
assay
colorimetric,
fluorescent,
photothermal
trimodal
detection
logic
gate
outputting
EC.
Briefly,
POD-like
Co@MOF-MIP
made
it
decompose
H2O2
into
·OH
oxidizing
colorless
3,3′,5,5′-tetramethylbenzidine
(TMB)
oxTMB,
resulting
in
660
nm
irradiated
effect
bursting
via
inner
filter
effect,
observing
decreased
signal
together
an
increased
colorimetric
signals.
However,
EC
could
specifically
fill
cavities
block
catalytic
substrates
TMB
out
further
reacting
inside
center
Co2+,
transformation
suppressing
yielding
concentration-dependent
responses
enhancement,
decreases.
Assisted
by
portable
devices
such
as
smartphones
hand-held
thermal
imagers,
onsite
analytical
platform
was
fast
accurate
low
limits
1.64,
1.24,
1.78
μg/L
modes,
respectively.
Interestingly,
these
reactive
events
be
programmed
classical
Boolean
analysis
offer
promising
avenue
big
data
Internet
Things
monitoring
residual
more
intelligent,
dynamical,
fast,
manner,
safeguarding
Analytical Chemistry,
Год журнала:
2023,
Номер
95(44), С. 16335 - 16342
Опубликована: Окт. 25, 2023
Cation
exchange
(CE)
is
a
burgeoning
method
for
controlled
crystal
synthesis;
however,
its
applications
in
bioanalysis
are
still
their
infancy.
Herein,
we
explored
the
transformation
of
ZnIn2S4
properties
after
CE
reaction
with
Cu2+
ions;
furthermore,
discrepancy
was
employed
to
design
dual-readout
detection
system
photothermal
and
polarity-switchable
photoelectrochemical
(PEC)
immunoassays
realize
reliable
carcinoembryonic
antigen
(CEA).
In
presence
CEA,
CuO
nanoparticles
(CuO
NPs)
as
dual-signal
response
probes
would
bond
microplates
be
acidolyzed
by
HCl
release
Cu2+,
which
could
replace
Zn2+
In3+
via
reaction.
After
completed,
photocurrent
switch
from
weak
anodic
cathode
one
using
635
nm
laser
signal
amplifier,
while
enhanced
808
illumination.
On
basis
PEC
strategy,
CEA
accurately
detected
0.1
50
ng
mL-1
limit
(LOD)
48
pg
(S/N
=
3).
Moreover,
assay
possesses
linear
range
0.5
100
LOD
0.21
mL-1.
addition,
designed
sensing
platform
only
relies
on
devices
portability
that
permitted
point-of-care
detection.
Journal of Agricultural and Food Chemistry,
Год журнала:
2023,
Номер
71(43), С. 16381 - 16390
Опубликована: Окт. 19, 2023
Considering
the
enormous
demand
for
meat
in
people's
daily
lives,
development
of
efficient
freshness
assays
is
great
significance
safeguarding
food
safety.
Here,
a
novel
bimetallic
nanozyme
Fe@CeO2
with
high
peroxidase-like
activity
was
first
synthesized
by
embedding
ferrocenecarboxylic
acid
(Fc)
into
hollow
CeO2
nanospheres,
which
combined
xanthine
oxidase
(XOD)
to
develop
self-supplying
H2O2-facilitated
enzymatic
cascade
catalytic
system
XOD
+
Fe@CeO2,
yielding
indicator
hypoxanthine
(Hx)-responsive
colorimetric
and
photothermal
dual-mode
analytical
platform
judging
upon
assistance
3,3',5,5'-tetramethylbenzidine
(TMB).
Owing
convert
Hx
H2O2,
rapidly
dissociated
it
•OH
via
peroxidase
activity-triggered
Fenton-like
reaction,
emerging
typical
reaction.
As
result,
colorless
TMB
oxidized
be
product
dark-blue
oxTMB
•OH,
chromogenic
reaction-driven
absorption
enhancement
at
652
nm,
endowed
significant
effect
under
660
nm
laser
irradiation.
On
this
basis,
an
concentration-dependent
signal
sensing
proposed
integrating
Color
Picker
App-installed
smartphone
laser-equipped
handheld
thermal
imager,
achieving
onsite
quantitative,
reliable,
visual
detection
real
samples
acceptable
results.
Notably,
improved
not
only
reliability
but
also
sensitivity
assay,
provided
new
insights
monitoring
safeguard
Environmental Science & Technology,
Год журнала:
2023,
Номер
57(36), С. 13397 - 13407
Опубликована: Авг. 29, 2023
Colorimetric
analysis
for
mercury
detection
has
great
application
potential
in
the
prevention
of
health
damage
caused
by
environment.
Sensitivity,
selectivity,
and
portability
are
core
competencies
sensors,
concentrating
these
properties
a
single
sensor
efficient
remains
challenge.
Herein,
hollow
structure
CuS@CuSe@PVP
(CCP)
was
prepared
which
enzyme-like
activities
could
be
activated
Hg2+
due
to
antagonism
between
Hg
Se,
inspiring
establishment
colorimetric
method
detection.
As
performance,
linear
range
(LR)
limit
(LOD)
were
1–900
0.81
nM
POD-like
activity
system,
respectively.
Also,
5–550
LR
2.34
LOD
achieved
OD-like
system.
Further,
smartphone-mediated
portable
RGB
nanosensor
fabricated,
with
down
6.65
system
7.97
Moreover,
excellent
self-calibration
satisfactory
recovery
94.77%–106.16%
shown
real
water
samples
analysis.
This
study
represented
advanced
progress
toward
emerging
applications
nanozymes
multiple
heavy
metal
will
accelerate
development
sensors.
