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Food allergies are a significant public health concern worldwide, affecting 5 to 10% of the population in developed nations. To increase customer confidence and provide more food options, it is crucial to enforce accurate labelling of food allergens. One efficient approach to achieve this is by detecting or confirming the presence of micro-, pico-, or even femtogram-level traces of food allergens in processed food products through the limit of detection (LOD). Nanomaterials (NMs) can enhance detection sensitivity and efficiency via electrical signal transduction by interfacing with bioreceptor molecules for biorecognition events, functioning as signalling molecules, and promoting signal amplification. This chapter focuses on prevalent food allergens and the importance of quick, inexpensive, and accurate analytical techniques for screening particular allergen levels in food products. NMs are characterised based on their various dimensions and qualities, with a particular emphasis on their costs. The chapter also explores the applications, limitations, and future prospects of low-cost platforms for NM-based detection of food allergy.

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