Determination of pantothenic acid in foods by optical biosensor immunoassay |
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Authors: | Haughey Simon A O'Kane Anthony A Baxter G Andrew Kalman Andras Trisconi Marie-José Indyk Harvey E Watene Gaylene A |
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Affiliation: | Xenosense Ltd, Unit 18, The Innovation Centre, Northern Ireland Science Park, Queen's Rd, Queen's Island, Belfast, N. Ireland, BT3 9DT. simon.haughey@xenosense.co.uk |
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Abstract: | An optical biosensor inhibition immunoassay was developed using a specific pantothenic acid-binding protein for the quantitation of free pantothenic acid (vitamin B5) in foodstuffs. Samples were prepared by a simple extraction procedure in buffer, and vitamin content was estimated against authentic calibrants in the same buffer. Performance parameters included a working range of 10-5000 ng/mL, a limit of detection of 4.4 ng/mL, precision relative standard deviation of 5.4-7.1% over a range of concentrations, and recoveries > 95% in the matrixes tested. A wide range of foodstuffs, including National Institute of Standards and Technology reference samples, were tested in 3 independent laboratories and the results were compared with microbiological assay and liquid chromatography/mass spectrometry (LC/MS) methods. The results indicate that the biosensor technique is appropriate for the estimation of pantothenic acid in a wide range of foodstuffs. |
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