Sodium Tripolyphosphate Use in Shrimp Raises Concerns Over Water Retention and Health Implications
Sodium tripolyphosphate (STPP), a highly processed phosphate salt, is commonly used in the seafood industry, particularly with shrimp, to enhance water-holding capacity, prevent protein denaturation, and maintain texture during freezing and thawing. This additive can significantly increase the amount of water shrimp retains, leading to a milky puddle when cooked instead of a proper sear. While a thin ice glaze is normal for frozen shrimp to prevent freezer burn, STPP treatment can result in substantial water retention, with some studies showing a 12.30% soaking gain and moisture content increasing from 73.4% to 80.6%. STPP is also found in other processed meats and seafood like scallops, ham, bacon, and processed cheese. The FDA recognizes STPP as a humectant, texturizer, stabilizer, emulsifier, and sequestrant. Consumers are advised to check ingredient labels for 'sodium tripolyphosphate,' 'STPP,' or similar phosphate terms, as untreated seafood typically lists only 'shrimp' or 'scallops' as ingredients.
