AITC residue analysis was carried out on ‘Tecla’ strawberries
treated
by
GL-derived
AITC,
0.1
mg
L−1,
for
4
and
6
h,
in
order
to
investigate
the
influence
of
treatment
length
on
residue
level.
Residue determination was performed on fruit 1 h after the treat-
ment and at the end of storage (2 days at 0 ◦C and 3 days at
20 ◦C), corresponding to consumption time. Solid phase micro-
extraction (SPME) coupled with GC-FID analysis was used. Treated
fruit randomly chosen from the trays (two per basket) were cut
into
small
pieces
and
samples
of
5
g
were
introduced
in
a
20
mL
vial.
Sample
pre-incubation,
extraction
and
injection
on
GC
were
performed through an automatic auto-sampler CombiPAL (CTC
Analytics) under the following conditions: 10 min pre-incubation
in the heated agitator block at the constant temperature of 80 ◦C
and agitation speed of 250 rpm; insertion of the SPME needle in the
sample
vial
and
exposure
of
the
fibre
for
10
min
extraction;
inser-
tion of SPME needle in the injector port and exposure of the fibre for
2 min at 260 ◦C, for compound thermal desorption. The extraction
fibre used was coated with 75 m Carboxen-polydimethylsiloxane
film (CAR-PDMS) (Supelco, Bellefonte, USA). GC analysis was car-
ried
out
on
a
Varian
GL-3800
equipped
with
a
J&W
DB23
column
(30 m, 0.25 mm, 0.25 m) and FID detector. The analytical con-
ditions
were:
injector
temperature
260 ◦C;
detector
temperature
280 ◦C; flow 1 mL min−1 of the carrier gas (nitrogen); column oven
temperature initially maintained at 50 ◦C for 6 min, followed by
a gradient to 220 ◦C, with a rate of 40 ◦C/min, finally held for
2 min. The splitless mode was used for injection. Blank samples
of untreated fruit were analyzed following the same protocol.
AITC quantification was performed plotting a calibration curve
by spiking blank samples of non-treated fruit with 10 L AITC
standard solutions in hexane, at different concentrations, in order
to minimize the matrix effect of fruit on AITC determination. Mea-
surements were replicated 8 times for treated fruit and 5 times for
calibration samples.
AITC residue analysis was carried out on ‘Tecla’ strawberries
treated
by
GL-derived
AITC,
0.1
mg
L−1,
for
4
and
6
h,
in
order
to
investigate
the
influence
of
treatment
length
on
residue
level.
Residue determination was performed on fruit 1 h after the treat-
ment and at the end of storage (2 days at 0 ◦C and 3 days at
20 ◦C), corresponding to consumption time. Solid phase micro-
extraction (SPME) coupled with GC-FID analysis was used. Treated
fruit randomly chosen from the trays (two per basket) were cut
into
small
pieces
and
samples
of
5
g
were
introduced
in
a
20
mL
vial.
Sample
pre-incubation,
extraction
and
injection
on
GC
were
performed through an automatic auto-sampler CombiPAL (CTC
Analytics) under the following conditions: 10 min pre-incubation
in the heated agitator block at the constant temperature of 80 ◦C
and agitation speed of 250 rpm; insertion of the SPME needle in the
sample
vial
and
exposure
of
the
fibre
for
10
min
extraction;
inser-
tion of SPME needle in the injector port and exposure of the fibre for
2 min at 260 ◦C, for compound thermal desorption. The extraction
fibre used was coated with 75 m Carboxen-polydimethylsiloxane
film (CAR-PDMS) (Supelco, Bellefonte, USA). GC analysis was car-
ried
out
on
a
Varian
GL-3800
equipped
with
a
J&W
DB23
column
(30 m, 0.25 mm, 0.25 m) and FID detector. The analytical con-
ditions
were:
injector
temperature
260 ◦C;
detector
temperature
280 ◦C; flow 1 mL min−1 of the carrier gas (nitrogen); column oven
temperature initially maintained at 50 ◦C for 6 min, followed by
a gradient to 220 ◦C, with a rate of 40 ◦C/min, finally held for
2 min. The splitless mode was used for injection. Blank samples
of untreated fruit were analyzed following the same protocol.
AITC quantification was performed plotting a calibration curve
by spiking blank samples of non-treated fruit with 10 L AITC
standard solutions in hexane, at different concentrations, in order
to minimize the matrix effect of fruit on AITC determination. Mea-
surements were replicated 8 times for treated fruit and 5 times for
calibration samples.
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