Synthesis and identification of antigenic conjugates of podophyllotoxin.
OBJECTIVE
To synthesize and identify artificial antigen of podophyllotoxin for the production of podophyllotoxin polyclonal antibody.


METHODS
The hapten was synthesized by two different chemical approaches and characterized by TLC, IR, NMR, and MS. Mixed anhydride reaction (MAR) and active ester method (AEM) were used to couple the podophyllotoxin to carrier proteins (BSA and OVA). Characterization of artificial antigens was done by using spectroscopy and electrophoresis. The anti-podophyllotoxin polyclonal antibodies were obtained through immunizing rabbits.


RESULTS
The results from IR, NMR and MS showed that 4-O-succinoyl podophyllotoxin (hapten) was successfully synthesized. The coupling molar ratios of the hapten and carrier proteins were 88.6 for Hapten-BSA1, 40.3 for Hapten-BSA2, 17.8 for Hapten-OVA1, and 54.2 for Hapten-OVA2. Hapten conjugates coupled with BSA yielded two sets of the specific and affinitive polyclonal antibodies. One set of antibodies showed an IC50 value of 2.21 microg.mL(-1) with a detection limit of 0.12 microg.mL(-1).


CONCLUSIONS
Antigenic conjugates were artificially synthesized, and based on these artificial antigens, polyclonal antibodies against podophyllotoxin were raised from rabbits immunized with two different immunogens and characterized with an indirect ELISA format.
Xu
Dun-Ming
DM
R&D Center of Biorational Pesticides, Northwest A & F University, Yangling 712100, China.
Yu
Xiang-Yang
XY
Liu
Ying-Qian
YQ
Feng
Jun-Tao
JT
Ma
Jung-Qing
JQ
Liu
Xian-Jin
XJ
Zhang
Xing
X
D000818:Animals; D000906:Antibodies / Q000032:analysis*; D000915:Antibody Affinity; D000917:Antibody Formation; D000972:Antineoplastic Agents, Phytogenic / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D006241:Haptens / Q000737:chemistry / Q000276:immunology*; D007106:Immune Sera / Q000737:chemistry; D008297:Male; D010047:Ovalbumin / Q000276:immunology; D011034:Podophyllotoxin / Q000276:immunology*; D011506:Proteins / Q000276:immunology*; D011817:Rabbits; D012710:Serum Albumin, Bovine / Q000276:immunology
D000906:Antibodies; D000972:Antineoplastic Agents, Phytogenic; D006241:Haptens; D007106:Immune Sera; D011506:Proteins; D012710:Serum Albumin, Bovine; D010047:Ovalbumin; D011034:Podophyllotoxin