Analytical
instruments
used
for
scientific
research
and
education
are
often
expensive.
This
limitation
poses
a
challenge
schools
educators
in
low-income
countries
to
provide
practical
science
training
students.
To
address
this
problem,
the
improvisation
of
analytical
instructional
materials
has
emerged
as
viable
solution.
By
incorporating
experiments
into
education,
students
have
opportunity
engage
directly
with
instruments,
conduct
investigations,
collect
data.
hands-on
approach
fosters
deeper
understanding
principles,
enhances
critical
thinking
skills,
cultivates
mindsets
among
Herein,
we
review
discuss,
step-by-step,
using
smartphone
quantitative
analysis,
referred
digital
image
colorimetry
(SDIC).
SDIC,
its
practicality
accessibility,
utilizes
cameras
acquisition
freely
available
processing
programs,
such
ImageJ
Apps,
quantification.
Using
SDIC
can
enable
develop
essential
including
thinking,
data
interpretation,
an
evidence-based
research.
leveraging
ubiquity
affordability
technology,
offers
accessible
cost-effective
bridging
gap
between
theory
practice
resource-constrained
settings.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(26)
Опубликована: Фев. 26, 2024
Abstract
The
hue‐recognition
based
point‐of‐care
diagnosis
favorites
both
human
visual
perception
and
imaging
analysis
with
portable
terminals.
Semiconductor
nanoplatelets
(NPLs)
as
an
emerging
narrow‐emissive
fluorophore
particularly
suit
above
color‐purity
desired
diagnosis,
but
are
hindered
by
their
intrinsic
hydrophobicity
difficulty
in
controlled
assembly.
Here
the
host‐guest
assembling
of
hydrophobic
NPLs
developed
within
3D
porous
space
dendritic
templates,
stepwise
surface
silanization
to
fabricate
silica‐NPLs‐silica
structure
(SNS).
enables
high
fluorescence
single
assembly
reaching
246‐fold
4‐fold
brightness
NPL
commercial
europium‐doped
polystyrene
bead.
strategy
is
compatible
various
colored
(≈540–640
nm
emission)
provides
stable
aqueous
colloids
well‐preserved
emission.
narrow
emission
SNS
enable
signal
amplification
visual/image
color
discrimination.
hue‐recognizable
lateral
flow
immunoassay
for
Severe
Acute
Respiratory
Syndrome
Coronavirus
2
(SARS‐CoV‐2)
nucleocapsid
protein
reveals
average
naked‐eye
interpretation
accuracy
92.9%
over
six
concentration
levels
referring
standard
card,
accompanied
a
quantification
linear
range
0.13–200
ng
mL
−1
limit
detection
0.13
smartphone.
diagnostic
results
SARS‐CoV‐2
positive
clinical
samples
demonstrate
easily
distinguishable
antigen
on
hue‐gradients,
which
holds
significance
home‐based
self‐testing
pathogens.
Journal of Chemical Education,
Год журнала:
2023,
Номер
101(1), С. 187 - 196
Опубликована: Дек. 13, 2023
Acetaminophen
can
be
determined
colorimetrically
via
its
reduction
of
ferricyanide
to
give
ferrocyanide.
The
ferrocyanide
formed
then
converted
the
highly
colored
compound,
Prussian
Blue,
addition
iron(III).
Quantification
is
commonly
obtained
by
measurement
absorbance
Blue
at
700
nm
using
a
commercial
spectrophotometry
instrument.
In
this
present
investigation
we
show
possibility
camera
smartphone
record
blue
color
developed
and,
subsequent
use
downloadable
free
App,
undertake
analysis
red,
green,
and
(RGB)
components
quantitatively
determine
concentration
acetaminophen
present.
A
number
Apps
downloaded
used
measure
RGB
balance
solution
formed.
Based
on
these
values
calibration
curve
constructed.
This
undertaken
in
ways,
as
demonstrated
here,
from
red
value,
expressed
percentage
total
recorded
(%R).
From
simple
mathematical
normalization,
it
was
found
possible
obtain
linear
relationship
with
(R2
=
0.994)
over
range
5–40
μM
acetaminophen.
An
associated
limit
detection
(LOD)
3.3
recorded.
compare
well
that
UV–vis
spectroscopy
0.996;
LOD
2.7
μM).
Analytical Methods,
Год журнала:
2024,
Номер
16(7), С. 1043 - 1049
Опубликована: Янв. 1, 2024
We
developed
a
smartphone-assisted
microchemistry
analyzer
for
the
quantitative
detection
of
carbofuran
using
paper-based
colorimetric
sensor,
Photoshop
software,
and
smartphone
app.
Talanta,
Год журнала:
2024,
Номер
276, С. 126254 - 126254
Опубликована: Май 12, 2024
A
quantitative
method
for
acid-base
titrations
in
paper-based
devices
(PADs)
is
described
to
analyze
acetic
acid
vinegar
samples.
In
this
work,
two
different
types
of
PADs
were
developed:
a
device
individual
spot
testing
and
microfluidic
device.
Digital
colorimetry
was
used
as
the
detection
method,
images
acquired
using
smartphone
homemade
box
with
LED
lights
controlled
image
acquisition.
Titration
curves
built
just
eight
points,
R
channel
based
on
gradual
color
transition
from
red
blue
litmus,
natural
indicator.
The
endpoint
accurately
determined
by
second
derivative
calculations.
Both
systems
applied
fifteen
samples
types,
good
concentration
results
obtained
comparison
reference
method.
proposed
methodology
simple,
fast,
environmentally
friendly,
surpasses
need
calibration
curve
construction.
Moreover,
subjective
identification
eliminated,
automated
provide
high
throughput
workflow,
suitable
quality
control
processes
real-time
measurements.
