Electrophoretic
Fraction
|
Protein |
Principal
function |
|
| a1 |
1.
Transthyretin (Prealbumin) |
-
binds retinol-binding protein, T4 |
| 2.
Albumin |
-
nutrition
-
maintains plasma colloid osmotic pressure
- transport of Ca++, T4 , unconjugated
bilirubin, free fatty acids, drugs and steroids |
| 3.
Antitrypsin |
-
inhibits some proteolytic enzymes |
| 4.
HDL (High density lipoprotein) |
-
transport of cholesterol from peripheral tissue to liver |
| 5.
Retinol binding |
-
transport of retinol |
|
| a2 |
1.
Thyroid binding globulin |
-
transport of thyroxine |
| 2.
Haptoglobins |
-
transport of free hemoglobin from destroyed red blood cells |
| 3.
VLDL (Very low density lipoprotein) |
-
transport of cholesterol and triglyceride |
| 4.
Ceruloplasmin |
-
transport of copper |
| 5.
Prothrombin |
-
proenzyme of thrombin |
| 6.
Angiotensinogen |
-
precursor of angiotensin I |
| 7.
Erythropoietin |
-
erythropoietic hormone |
|
| b1 |
1.
LDL (Low density lipoprotein) |
-
transport of cholesterol and other lipids |
| 2.
Plasminogen |
-
profibrinolysin, precursor of fibrinolysin |
| 3.
Fibrinogen |
-
coagulation factor I |
|
| b1b2 |
1.
Complement (C4) |
-
lysis of foreign cells |
| 2.
Transferrin |
-
transport of iron |
|
| b2 |
Glycoproteins |
-
unknown |
|
| g |
Blood
group globulins and immunoglobulins |
-
contain various antibodies, blood globulins, complement C1,
C2 and so on |
|