Biogenic amines are nitrogenous compounds formed by decarboxylation of amino acids through microbial enzymatic activity. The most significant from a food safety perspective is histamine, formed from histidine by bacterial histidine decarboxylase. Scombroid poisoning (histamine intoxication) is associated with fish of the Scombridae family (tuna, mackerel, bonito, skipjack) and occurs when fish are temperature-abused after catch, allowing Morganella morganii, Hafnia alvei, and other histamine-producing bacteria to proliferate. Symptoms include flushing, headache, palpitations, and gastrointestinal distress within minutes to hours of consumption.
Tyramine is formed from tyrosine and is primarily associated with aged cheeses, cured meats, fermented soybean products, and certain beers. In susceptible individuals, particularly those taking monoamine oxidase inhibitors (MAOIs), high tyramine intake can precipitate hypertensive crisis. Putrescine and cadaverine, formed from ornithine and lysine respectively, do not cause direct toxicity at normal levels but enhance histamine toxicity by inhibiting intestinal detoxification enzymes (diamine oxidase). They also serve as useful spoilage indicators for meat and seafood quality.
Detection of biogenic amines is performed primarily by HPLC with UV or fluorescence detection after derivatization with dansyl chloride, benzoyl chloride, or o-phthalaldehyde (OPA). HPLC-MS/MS methods offer higher specificity and lower detection limits. Enzyme-based biosensors provide rapid screening for histamine in fish. Regulatory limits vary: the FDA has set 50 ppm as the hazard action level for histamine in tuna, while the EU establishes limits of 100-200 ppm depending on fish species and sampling plan. The European Food Safety Authority (EFSA) has established no-observed-adverse-effect levels (NOAEL) for histamine and tyramine.
Prevention of biogenic amine formation centers on rigorous cold chain management. Histidine decarboxylase activity in fish is minimal below 4°C, but psychrotolerant bacteria can still produce amines in prolonged storage. Rapid chilling after catch, continuous temperature monitoring, and time-temperature indicators are essential control measures. In fermented products, use of selected starter cultures lacking amino acid decarboxylase activity and proper fermentation conditions minimize amine accumulation. Biogenic amine levels can be reduced through high-pressure processing, irradiation, or application of amine-degrading microorganisms. Biogenic amines are associated with spoilage of meat and seafood and can be detected by HPLC. Unlike food infection, biogenic amine poisoning is a form of chemical intoxication.
