SIMPLE PROTEINS
NAME OF PROTEIN
Albumin
Globulins
Glutelins
Prolamines
SOLUBILITY
COAGULABILITY
Soluble in water and Coagulated by heat and
dilute neutral salt solutions precipitated
by
full
saturation with (NH4)2
SO4 but not with NaCl
except in the presence of
acid
Soluble in neutral dilute Coagulated by heat and
salt solution but not in can be precipitated from
water
their solutions by half
saturation with (NH4) SO4
and complete saturation
with NaCl
Soluble in dilute acids and
alkalies but insoluble in
neutral solvents
Soluble in dilute acids and Not coagulated by heat
alkalies but insoluble in
neutral solvents
Insoluble
in
ordinary
solvents such as water
and dilute salt solutions
Soluble in 70% alcohol at
neutral point
EXAMPLES
Serum albumin (blood)
Lactalbumin (milk)
Ovalbumin (egg white)
Ovoglobulin (egg white)
Edestin (hempseed)
Legumin (pees)
Mysinogen (muscles and
serum globulin)
Glutelin (wheat)
Oryzenin (rice)
Gliadin (wheat)
Zein (corn)
Hordein (barley)
Histones
Soluble in water, dilute Readily coagulated
acids and alkalies, but not heat
in dulute ammonia
by Globin (hemoglobin)
Thymus histone
Scobrone (mackerel)
pH properties: They are
strongly basic and occur
in the tissues in the form of
salt combination with
acid substances
Protamines
Soluble in water and Not coagulated by heat
dilute acids and alkalies
pH properties: They are
strongly basic and form
soluble salts with strong
mineral acids
Scleroproteins
Insoluble in water and
neutral solvents
Salmin (salmon sperm)
Keratin
Elastin
Collagen
CONJUGATED PROTEINS
NAME OF PROTEIN
Nucleoproteins
Glycoproteins
Phosphoproteins
Chromoproteins
Lipoproteins
SOLUBILITY
COAGULABILITY
EXAMPLES
Soluble in dilute solutions They are precipitated by Chromatin
of NaCl and can be acidification
Germ of grains
extracted from the tissues
by use of this solvent
Mucin (saliva)
Tendons
Osseomucoid (bones)
Casein (milk)
Vitelline (egg yolk)
Hemoglobin
Cytochromes
Rhodopsin
Blood serum
Brain tissues
Cell nuclei
Egg yolk
Milk
PRIMARY PROTEIN DERIVATIVES
NAME OF PROTEIN
Proteans
Metaproteans
Coagulated proteins
Primary proteoses
SOLUBILITY
COAGULABILITY
Insoluble
substances
resulting
from
the
preliminary
action
of
water, dilute acids or
enzymes
Soluble in weak acids and
alkalies but insoluble in
neutral salt solution
Insoluble
products
resulting from either the
action of heat, alcohol or
UV rays
Soluble in water
Precipitated
by
concentrated HNO3 and
by half saturation with
(NH4)2 SO4 or ZnSO4
Secondary proteoses
Peptones
Soluble in water
Not coagulated by heat
Precipitated
only
by
complete saturation with
ammonium sulfate but
not with nitric acid or
picric acid
Not coagulated by heat
and not precipitated by
saturation
with
ammonium sulfate but by
EXAMPLES
Myosin
Edestin
Acid metaproteans
Alkali metaproteans
Cooked egg albumin
Cooked meat
Peptides
certain
alkaloidal
reagents
Same properties as peptones