Sulphating agents, sodium bisulphite and sodium metabisulphite, are used with shrimp, lobster and related crustaceans to prevent melanosis (a.k.a. "blackspot"). While sulphating agents are very beneficial to the seafood industry, some consumers are highly allergic to sulphite residues in food. For seafood, residual concentrations less than 100 ppm have been considered adequate to prevent melanosis on various shrimp, lobster and other kinds of seafood. Labelling is required if the edible portion exceeds 10 ppm. For this reason, FDA regulations state that seafood containing sulphite residues of 10 parts per million (ppm) or more must be labelled as containing sulphites. Monitoring and verification of sulphite residues are required as part of a Hazard Analysis and Critical Control Points (HACCP) program. Alert® for Sulphites is a very simple and rapid semi-quantitative test for detecting sulphite residues in shrimp.

Features and Benefits

  • Simple three step method
  • Rapid time to results
  • Visual interpretation, no equipment

Product Specifications

  • Sensitivity:
    • < 10 ppm
    • > 10 ppm to < 100 ppm
    • > 100 ppm
  • Testing time: 1 minute
  • Storage: Room temperature (18–30°C)
  • Tests per kit: 200


Order Details

Product # Product Description
9500 Alert for Sulphites

Reference Materials

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