[Chemiluminescent detection of E. coli O157:H7 in food based on magnetic enzyme-linked immuno method].

Aim: To establish a new chemiluminescent assay with high sensitivity for detecting E. coli O157:H7 in food.

Methods: The assay was established based on the alkaline phosphatase (ALP) labeled anti-E. coli O157:H7 antibody, which reacted with an excellent chemiluminescent reagent, 3(2' spiroadamantane)4 methoxy 4(3''phosphoryloxy) phenyl 1,2 dioxetane (AMPPD) buffer solution and emitted the photons.

Results: The sensitivity of chemiluminescence assay was 850, and the linear range was 1000-50,000. The intra- and interassay CV values (CVs) were respectively below 15% and 20%. The correlation coefficient was 0.9807 by comparing with the conventional counting method.

Conclusion: The chemiluminescent immunoassay is more accurate than other methods in the detection of concentration of E. coli O157:H7 in samples.