ดวงกมล ปรุงวิทยา. Production of Antibody (IgY) from Egg for Feed Additive and Enhance Pork Quality. Master's Degree(Biotechnology). King Mongkut's University of Technology Thonburi. KMUTT Library. : King Mongkut's University of Technology Thonburi, 2009.
Production of Antibody (IgY) from Egg for Feed Additive and Enhance Pork Quality
Abstract:
Reduction of fat content in meat-producing animals is highly desirable for both
consumers and producers. Control of fat storage in porcine adipose tissue by
immunological methods using an antibody specific to adipocyte plasma membrane is
one of many approaches. Thus, production and characterization of immunoglobulin Y
(IgY) specific to porcine adipocyte plasma membrane from chicken egg was carried out
in this study for further used in fat reduction. Porcine adipocytes were first isolated from
adipose tissues and then the membrane was extracted, fractionated by centrifugation and
partial purified by ultracentrifugation using sucrose gradient. The partial purified
adipocyte membrane was subsequently used to immunize laying hens (Hisex). Eggs laid
by immunized hens were collected throughout the antibody production phase. The IgY
was then extracted from egg yolk in which its presence was determined by EnzymeLink
Inununosorbent Assay (ELISA). Inununocytochemistry and immunohistochemistry
were performed in order to determine the specificity of the IgY to isolated adipocytes
and adipocytes in adipose tissue, respectively. It was found that the IgY specifically
bound to the membranes of both the isolated adipocytes and adipocytes in adipose
tissue. This IgY was also found weakly bind to muscle tissue but not muscle fiber. It
also weakly bound to spleen tissues. This is due probably to the presence of some small
numbers of adipocytes surrounded or infiltrated muscle or spleen tissues with no direct
effect on the tissues. Since the IgY will be used by oral application, its pH stability was
therefore determined. The IgY was stable at pH 6 and 7. However, the activity was
reduced after incubation in acid condition. IgY activity remained approximately at
74 and 57 percent after 1 hr incubation at pH 3 and pH 2, respectively. Since more than
half of IgY activities remained after the IgY was exposed to these acid conditions for
1 hr, the duration to be in stomach, it could be supplied together with swine feed for
reduce fat contained in the tissues.