Application of Modified Atmosphere Packaging on Quality of Selected Vegetables: A Review - Application of Modified Atmosphere Packaging on Quality of Selected Vegetables - page 27

Iceberg lettuce
( Lactuca
sativa ) var.
capitata L

Passive MAP Film with OTR: 3,529 mL

O 2 /m 2 24 h atm.

Intense light pulse (ILP)
treatment prior to
packaging

7 °C for 9 days Browning was

intense on day
3 and onwards
for treated
lettuce
samples

A 0.46 log CFU/g
reduction on
psychrotrophic
counts was achieved
by ILP. Yeasts
counts remained at
low levels with no
signifi cant
differences from the
control

Treated samples
were rejected on
day 3 due to poor
visual quality

Both samples,
treated and
control had a
shelf life of 3
days

Gomez-Lopez
et al. ( 2005 )

Iceberg lettuce
( Lactuca
sativa ) var.
capitata L.

2-4 % O 2 and
9 % CO 2

Film with OTR: 1,810 mL
O 2 /m 2 day atm.

Immersion for 1 min in a
solution of 0.5 %
HCl- L -cysteine
monohydrate and
treatment with ClO 2
(1.74 mg/L concentration)

7 °C for 9 days Tissue

browning was
prevented by
immersion in
the L -cysteine
solution

The reduction
achieved by ClO 2
treatment was 0.84,
0.88 and 0.64 log
CFU/g for APC,
psychrotrophs and
yeasts compared to
control

Even though
browning was
signifi cantly
reduced by cysteine
treatment, off odors
and bad fl avor were
the limiting factors
for treated samples

Shelf life of all
samples, treated
and untreated
was limited to 4
days due to
poor overall
sensory quality

Gomez-Lopez
et al. ( 2008 )

Iceberg lettuce
( Lactuca
Sativa L .) var.
Raleigh-
Patriot

PMAP PO laminate 44 ʼ m thick Lettuce was washed with

chlorinated water
(0.8-2.0 ppm of free
chlorine) and ʳ -irradiated
with 0.1-0.5 kGy 2 days
after packaging

2 ± 2 °C—10 days Combination of

both chlorine and
irradiation treatment
reduced both APC
and yeast
populations
(290 CFU/g and
60 CFU/g,
compared 220 000
and 1 400 CFU/g
for treated and
control samples,
respectively)

Shear force
of irradiated
samples was
signifi cantly
reduced
compared to
control

Shelf life of
irradiated and
control samples
did not differ
signifi cantly

Hagenmaier and
Baker ( 1997 )

with O 2 and CO 2
permeabilities of 3,800 and
13,000 mL m −2 day −1 atm. −1

(continued)