4. Discussion
The authentication of species substitution has become an important issue within the food industry and there is growing
requirement for rapid, reliable and reproducible tests to verify species in fishery products. In this study, a species-specific PCRbased assay for detection of N. albiflora was developed using self designed primer pair. The detection limits was found to be less than 0.5%(wt) in admixed surimi products of Yellow Drum and Large Yellow Croaker, even in chewed and vomited samples, N. albiflora could also be detected successfully. The PCR assay can be used to identify the origin of food poisoning accident from food sources (environmental pollution or illegal additives) to minimize the risks of food safety.
Fig. 1. Electrophoresis of genomic DNA extracted from commonly used species in fishballs [1% (w/v) agarose gel]. M: l HindIII marker; Lane 1: Yellow Drum; Lane 2: Large Yellow Croaker; Lane 3: Eel; Lane 4: Hairtail; Lane 5: Silver carp; Lane 6: Grass Carp;Lane 7: Bighead carp; Lane 8: Chicken; Lane 9: pork; Lane 10: Corn starch; Lane 11:
Wheat starch.
Fig. 2. Electrophoresis of genomic DNA isolated from Yellow Drum in different processing stages [1% (w/v) agarose gel]. M: l HindIII marker; Lane 1: Fresh Yellow Drum;Lane 2: Yellow Drum surimi; Lane 3: Yellow Drum surimi with salt; Lane 4: Yellow Drum balls; Lane 5: Boiled Yellow Drum balls; Lane 6: Fried Yellow Drum balls; Lane 7:Yellow Drum balls (chewed); Lane 8: Yellow Drum balls (vomited).Fig.