Definition of Pepsin
Pep´sin
Pronunciation:
pĕp´sĭn
n.
1.
(Physiol. Chem.)
A
proteolytic
enzyme
(
MW
34
,
500
)
contained
in
the
secretory
glands
of
the
stomach
.
In
the
gastric
juice
it
is
united
with
dilute
hydrochloric
acid
(
0
.
2
per
cent
,
approximately
)
and
the
two
together
constitute
the
active
portion
of
the
digestive
fluid
.
It
degrades
proteins
to
proteoses
and
peptides
,
and
is
notable
for
having
a
very
low
pH
optimum
for
its
activity
.
It
is
the
active
agent
in
the
gastric
juice
of
all
animals
.
Related Words
enzyme
,
gastric
juice
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