Application of Modified Atmosphere Packaging on Quality of Selected Vegetables: A Review - Application of Modified Atmosphere Packaging on Quality of Selected Vegetables - page 25

Butterhead
lettuces
( Lactuca
sativa L .) cv.
Zendria

Active CA with
0-100 % O 2 and
0, 10, 20 % CO 2

1, 5 and
9 °C—10 days

Respiration
rate was
reduced in
moderate CO 2
storage
conditions
with increased
O 2 levels

Fermentation of
lettuce was avoided
in packages with
superatmospheric
conditions (80 kPa
O 2 and 10-20 CO 2 )

Escalona et al.
( 2006 )

Iceberg lettuce
cv.
Sharpshooter

PMAP Film bags (E-300, Cryovac)

with an OTR of
4,000 cm 3 /h/m 2

Lettuce was dipped in
either 5 or 47 °C water for
2 min, was packaged and
then exposed to 0, 0.5, 1,
or 2 kGy ʳ -radiation

3 °C—21 days Irradiated and

heat treated
samples had
better visual
quality
compared to
control

Texture was
better
preserved
on samples
irradiated
with low
doses
whereas
high doses
(2 kGy)
increased
cellular
leakage and
sogginess

Irradiation with low
doses (0.5 and
1 kGy) and warm
water treatment
preserved sensorial
characteristics
better than all the
other treatments
without any losses
in vitamin C or total
antioxidants

Samples
irradiated (0.5
and 1 kGy) heat
treated and
stored under
PMAP
remained
sensorially
acceptable for
21 days

Fan et al. ( 2003 )

Iceberg lettuce
( Lactuca
Sativa L ). var
Alladin

1. Passive MAP
2. Active MAP
after gas fl ush
with N 2 . The
resulting
atmosphere was
4 % O 2 -96 % N 2

35 ʼ m OPP Shredded lettuce was

dipped in chlorine
solution (100 ppm for
5 min) or citric acid (1 %,
5 min dip) solution. Then,
the leaves were inoculated
with L. Innocua and L.
monocytogenes strains

3 and
8 °C—14 days

Storage at 8 °C of
samples that
underwent the
antimicrobial dip
resulted in
signifi cant increase
of both L. innocua
and L.
monocytogenes
populations by 2 log
CFU/g. Mesophile
bacteria reduction
by the antimicrobial
dip was 0.5-1 log
CFU/g initially and
reached 1-2 log
CFU/g during the
storage period

Both N 2
fl ushing and the
use of
antimicrobial
dips favored
Listeria survival
at both storage
temperatures
while on
samples stored
at 8 °C the
strains
demonstrated a
signifi cant
growth

Francis and
O'Beirne ( 1997 )