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Screening assays, for example, lateral flow assays (LFAs), can improve traceability, but often lack the required reliability. This paper gives an alternative approach for secure on-site compliance testing, using allergens as a case study. As a screening assay, a smartphone raw image analysis of the LFA gives an initial quantification of the proteins separated in the LFA . The proteins are then extracted from the LFA, and analysed by LC-MS (liquid chromatography-mass spectrometry) to quantify them more accurately. This approach was applied successfully to the allergenic proteins in peanuts and gluten.  

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