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Allergens are a major food safety concern and incidences of food allergy in industrialised populations has increased in recent times. One of the most common food allergies is that of peanuts. Food regulations for allergens exist in many countries and are being modified regularly as more is understood about allergens and the reactions they cause. This presentation describes the use of time-of-flight mass spectrometry to locate, identify and quantify an allergenic protein in both raw and roasted peanuts. Typical food processing (e.g. food processing) can alter the markers peptides present and amount that they are present in the samples which adds complexity to the analysis.