The
lack
of
handy
and
reliable
sensing
strategy
for
non-contact
freshness
assessment
is
a
problem
faced
by
food
industries.
This
work
presented
an
innovative
solution
monitoring
proteinous
foods:
halochromy-
fluorescence-based
dual-response
sensors
with
rapid
irreversible
readout.
Sensors
were
prepared
the
polycondensation
CdTe
quantum
dots
(QDs)-doped
silane
coupling
agents
onto
filter
papers
then
anchoring
pH-sensitive
halochromic
compounds
like
blueberry
anthocyanin
(BA)
electrostatic
interaction.
as-designed
showed
(within
1
min)
responsiveness
on
both
appearance
fluorescence
under
total
volatile
basic
nitrogen
(TVB-N)
atmosphere
through
structural
variations
BA
inner
effect
(IFE)-induced
quenching
QDs,
such
dual-signal
response
could
be
sustained
at
least
7
days
after
removal
TVB-N.
As
proof-of-concept,
spoilage
foods
was
experimentally
proved
to
highly
feasible
using
pork,
shrimps
shelled
eggs
as
representatives
real
samples.
Smartphone-based
digital
color
information
paper
before
furtherly
applied
reconstruct
digitized
binary
response,
reinforcing
credibility
this
strategy.
Trimethylamine
identified
UHPLC-HRMS
in
leachates
spoiled
also
double-checked
rationality
work.
Journal of Agricultural and Food Chemistry,
Journal Year:
2024,
Volume and Issue:
72(9), P. 4493 - 4517
Published: Feb. 21, 2024
With
the
global
limited
food
resources
receiving
grievous
damage
from
frequent
climate
changes
and
ascending
demand
resulting
increasing
population
growth,
perovskite
nanocrystals
with
distinctive
photoelectric
properties
have
emerged
as
attractive
prospective
luminogens
for
exploitation
of
rapid,
easy
operation,
low
cost,
highly
accurate,
excellently
sensitive,
good
selective
biosensors
to
detect
foodborne
hazards
in
practices.
Perovskite
demonstrated
supreme
advantages
luminescent
biosensing
products
due
their
high
photoluminescence
(PL)
quantum
yield,
narrow
full
width
at
half-maximum
PL,
tunable
PL
entire
visible
spectrum,
preparation,
various
modification
strategies
compared
conventional
semiconductors.
Herein,
we
carried
out
a
comprehensive
discussion
concerning
application
high-performance
products,
including
brief
introduction
nanocrystals,
nanocrystal-based
biosensors,
different
categories
products.
Finally,
challenges
opportunities
faced
by
superior
were
proposed
promote
practicality
future
supply.
Inorganic Chemistry,
Journal Year:
2024,
Volume and Issue:
63(35), P. 16274 - 16283
Published: Aug. 18, 2024
Different
types
of
electron
transfers
(ETs)
underlie
the
versatile
use
various
solid
viologen-derived
compounds,
which
is
still
insufficiently
understood
and
difficult
to
control.
Here,
we
demonstrate
an
effective
strategy
for
modulating
key
ET
process
in
crystalline
metalloviologen
compounds
(MVCs).
By
adjusting
coordinated
transition
metal
ions
bearing
different
electronic
structures
(e.g.,
d5,
d7,
d10),
three
MVCs
(i.e.,
Mn-1,
Co-2,
Cd-3)
with
highly
consistent
coordination
environments
have
been
synthesized
successfully.
Surprisingly,
whether
photochromism
(energy-induced
mechanism)
or
specific
analyte
recognition
(molecule-induced
mechanism),
compound
Cd-3
exhibits
obvious
photochromic
behavior
differential
dimethylamine
detection.
Combined
detailed
structural
analysis
theoretical
calculations,
such
unique
ion-dependent
properties,
were
correlated
fine
modulation
density
bipyridinium
cores
by
ions.
Additionally,
thanks
delicate
vapor,
a
convenient
test
strip
Cd-3-PAN
was
prepared
as
sensitive
biogenic
amine
sensor
evaluating
real-time
freshness
seafood.
