Ultrasensitive and rapid detection of β-conglutin combining aptamers and isothermal recombinase polymerase amplification.
Anal Bioanal Chem 2016;
409:143-149. [PMID:
27766362 DOI:
10.1007/s00216-016-9973-2]
[Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 09/14/2016] [Accepted: 09/23/2016] [Indexed: 02/07/2023]
Abstract
Lupin is increasingly being used in a variety of food products due to its nutritional, functional and nutraceutical properties. However, several examples of severe and even fatal food-associated anaphylaxis due to lupin inhalation or ingestion have been reported, resulting in the lupin subunit β-conglutin, being defined as the Lup an 1 allergen by the International Union of Immunological Societies (IUIS) in 2008. Here, we report an innovative method termed aptamer-recombinase polymerase amplification (Apta-RPA) exploiting the affinity and specificity of a DNA aptamer selected against the anaphylactic β-conglutin allergen termed β-conglutin binding aptamer II (β-CBA II), facilitating ultrasensitive detection via isothermal amplification. Combining magnetic beads as the solid phase with Apta-RPA detection, the total assay time was reduced from 210 min to just 25 min, with a limit of detection of 3.5 × 10-11 M, demonstrating a rapid and ultrasensitive generic methodology that can be used with any aptamer. Future work will focus on further simplification of the assay to a lateral flow format. Graphical Abstract Schematic representation of the rapid and novel bead-based Apta-RPA assay.
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