.
Introduction
Mushrooms
are
highly
transpiring
and
respiring
fresh
com-
modities.
They
are
sensitive
to
surrounding
humidity
levels;
low
relative
humidity
(RH)
results
in
excessive
loss
of
weight
and
fi
rmness,
while
very
high
RH
favours
water
vapour
condensation
on
mushroom
surface,
which
accelerates
microbial
growth
and
discolouration
(
Mahajan
et
al.,
2008a
).
Thus,
their
postharvest
life
is
shortened
as
consequence
of
these
processes.
Appropriate
packaging
is
one
of
the
essential
methods
for
protecting
and
maintaining
the
quality,
and
prolonging
the
shelf
life
of
produce
from
growers
to
consumers.
It
is
well
established
that
package
gas
composition
in
modi
fi
ed
atmosphere
packaging
(MAP)
is
in
fl
uenced
by
respiration
rate
of
the
product
and
the
gas
permeability
of
the
packaging
fi
lm
(
Song
et
al.,
2002;
Caleb
et
al.,
2013a
).
Current
MAP
design
considers
the
respiration
rate
of
product
as
the
only
important
parameter
for
deciding
target
gas
barrier
properties
required
to
achieve
an
equilibrium
modi
fi
ed
atmospheres.
However,
besides
in-package
gas
composition
it
is
also
important
to
control
the
in-package
level
of
relative
humidity,
.
Introduction
Mushrooms
are
highly
transpiring
and
respiring
fresh
com-
modities.
They
are
sensitive
to
surrounding
humidity
levels;
low
relative
humidity
(RH)
results
in
excessive
loss
of
weight
and
fi
rmness,
while
very
high
RH
favours
water
vapour
condensation
on
mushroom
surface,
which
accelerates
microbial
growth
and
discolouration
(
Mahajan
et
al.,
2008a
).
Thus,
their
postharvest
life
is
shortened
as
consequence
of
these
processes.
Appropriate
packaging
is
one
of
the
essential
methods
for
protecting
and
maintaining
the
quality,
and
prolonging
the
shelf
life
of
produce
from
growers
to
consumers.
It
is
well
established
that
package
gas
composition
in
modi
fi
ed
atmosphere
packaging
(MAP)
is
in
fl
uenced
by
respiration
rate
of
the
product
and
the
gas
permeability
of
the
packaging
fi
lm
(
Song
et
al.,
2002;
Caleb
et
al.,
2013a
).
Current
MAP
design
considers
the
respiration
rate
of
product
as
the
only
important
parameter
for
deciding
target
gas
barrier
properties
required
to
achieve
an
equilibrium
modi
fi
ed
atmospheres.
However,
besides
in-package
gas
composition
it
is
also
important
to
control
the
in-package
level
of
relative
humidity,
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