Aptamers are biomolecular ligands composed of nucleic acids. They can be developed to bind specifically to a range of target molecules and subsequently exploited in a fashion analogous to more traditional biomolecules such as antibodies. Methods for the production of aptamers and their potential applications to the food industry in the form of rapid assays and biosensors are discussed. In contrast to antibody-based diagnostics, aptamers can be produced in animal-free systems which have clear ethical and financial benefits. This review identifies a need for the development of new aptamers with specificity against micro-organisms and highlights their potential use for the detection of food-borne pathogens.

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We have characterized the 5'-end (3218 bp) of the rat phenylalanine hydroxylase (PAH) gene. Within this PAH promoter sequence, we have identified a number of putative regulatory sites analogous to those present in the human and murine PAH promoters. In particular, potential HNF 1 binding sites and a CRE have been identified. These sequences respectively bind HNF1 and CREB transcription factors present in rat nuclear extracts and may be significant in the tissue-specific and hormonal control of PAH expression.

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