Octopamine (OA) is one of the biogenic monoamines in the housefly, which acts as an important neurohormone in the physiological process of this pest. In this study, a new hapten of OA was synthesized via aldol condensation. With the hapten, monoclonal antibodies (MAb) were generated and their characterizations were investigated. An indirect competitive enzyme-linked immunosorbent assay (icELISA) based on MAb 3C11-E3 was established, which required simple sample pre-treatments and had low cross-reactivity with OA structural analogise. The half maximal inhibition concentration (IC50) and the detected range (IC20-IC80) of the icELISA were 128 ng/mL and 12-1438 ng/mL, respectively. Average recoveries of OA ranged from 73 to 129% in the housefly.
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