Applicability of PCR methods for detection of shrimp and crab in processed food
2014
: According to Japanese food allergen labeling regulations, an ELISA screening test is used for detection of crustacean proteins in food and a shrimp/crab-PCR confirmation test is used to confirm a positive ELISA screening test and to exclude false positives. Forty-six kinds of processed foods labeled as containing shrimp/crab were subjected to ELISA screening test and PCR confirmation test and the usefulness of the shrimp/crab-PCR was evaluated. Twenty-seven of the 46 samples contained total crustacean protein levels of 10 ppm or more in the ELISA screening test. All of the samples were positive in the shrimp/crab-PCR confirmation test. The results of the confirmation test were consistent with the declaration in the list of ingredients and with the results of the ELISA screening test. The shrimp/crab-PCR confirmation test was demonstrated to be applicable to various kinds of foods, including powder, extract, seasoning paste, prepared frozen food, snack food, retort food and canned food.
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