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. 2019 May 23;11(5):292. doi: 10.3390/toxins11050292

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Calibration curve showing the 440/330 nm ratios of the fluorescence intensity at different concentrations of OTA in coffee. The error bars indicate the standard deviation from three independent experiments. LOD: limit of detection.