Detection and Analysis on Staphylococcal Enterotoxins in Raw Cow Milk from Different Regions of Jinan,China

[Objective] This study was conducted to investigate the pollution caused by staphylococcal enterotoxins(SE) in raw milk and the safety of dairy products in Jinan, and to provide a scientific basis for food safety risk analysis. [Method] A total of 130 raw milk samples were collected from different regions of Jinan, and detected for Staphylococcus aureus by referring to GB4789.10-2010. Then, enzyme-linked immunosorbent assay was performed to detect whether the S.aureus strains produced enterotoxins, and the enterotoxin type was identified using colloidal gold-based immunochromatographic test strips. [Result] Fiftyseven of the raw milk samples were polluted by S.aureus, so the detection rate of S.aureus was 43.85%; and 11 of the strains produced enterotoxins. Among the 11 enterotoxin-producing strains, seven produced SEB, only one produced SEC, and the SE type of other three strains was not identified. [Conclusion] Enzyme-linked immunosorbent assay and colloidal gold-based immunochromatographic test strips can be used in combination to rapidly detect staphylococcal enterotoxins and identify enterotoxin type, although there are some limitations. SEB is the main type of staphylococcal enterotoxin causing pollution in milk of Shandong Province.