Food Chemistry X,
Journal Year:
2024,
Volume and Issue:
23, P. 101547 - 101547
Published: June 11, 2024
Taiping
Houkui
(TPHK)
is
prevalent
green
tea
in
China,
its
flavor
quality
significantly
influenced
by
different
production
regions.
However,
the
key
compounds
responsible
for
these
discrepancies
remain
unclearly.
Here,
TPHK
samples
were
produced
from
fresh
leaves
of
'Shidacha
2'
cultivar
planted
14
distinct
In
samples,
a
total
33
non-volatile
identified
and
quantified.
Partial
least-squares
discriminant
analysis
(PLS-DA)
reveal
that
theanine
glutamate
main
umami
compounds,
caffeine
imparted
with
bitterness,
which
collectively
contributed
to
variation
taste
across
Furthermore,
profiles
51
volatile
determined,
integrated
PLS-DA
odor
activity
values
volatiles
indicated
linalool
(165.7–888.5)
geraniol
(11.9–141.4)
affecting
floral
aroma
among
Our
findings
revealed
critical
effect
regions
on
TPHK.
Food Chemistry X,
Journal Year:
2025,
Volume and Issue:
25, P. 102162 - 102162
Published: Jan. 1, 2025
To
overcome
the
time-consuming
off-site
limitations
in
conventional
pesticide
detection,
this
contribution
presents
an
situ
quantitative
analysis
detection
strategy
for
pesticides
on
leaf
surfaces
using
matrix-assisted
laser
desorption/ionization
time-of-flight
mass
spectrometry
imaging
technology.
Taking
fungicide
metrafenone
as
a
representative,
we
initially
screened
seven
commonly
used
matrices,
and
identifying
α-cyano-4-hydroxycinnamic
acid
most
effective
one
positive
mode.
Subsequently,
coating
matrix
sublimation
spraying
method
resulted
highest
intensity.
The
optimal
combination
of
operation
parameters
were
established
with
step
size
30
μm
×
μm,
diameter
75
energy
4.01
μJ/pulse.
Under
these
conditions,
lowest
limit
0.6
ng/mm2
was
reached
metrafenone,
demonstrating
extremely
high
sensitivity
strong
repeatability.
This
exhibits
great
potential
various
pesticides,
including
triadimefon
tebuconazole,
thereby
offering
innovative
approaches
to
residues.
