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For this purpose, we designed fluorescent probes for potassium cations that were suitable for displacement assays with cereulide from organic extracts. The fluorescence detection of natural cereulide in rice samples was achieved by using synthetic cereulide as a reference and a potassium fluorescent reporter, and this was found to be useful as a portable and fast method for the in\u2005situ detection of cereulide in food extracts. To study the fate of cereulide in live cells, we designed a procedure that was suitable for live\u2010cell microscopy imaging of HeLa cells by comparing the cellular location of the potassium fluorogenic probe, which stained intracellular endolysosomes, in the absence and presence of cereulide; we concluded that in the presence of cereulide, the fluorescence of the probe was decreased because of complexation of the potassium ions by cereulide.<\/jats:p>","DOI":"10.1002\/open.201700057","type":"journal-article","created":{"date-parts":[[2017,6,12]],"date-time":"2017-06-12T08:56:42Z","timestamp":1497257802000},"page":"562-570","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Potassium\u2010Ion\u2010Selective Fluorescent Sensors To Detect Cereulide, the Emetic Toxin of <i>B.\u2005cereus<\/i>, in Food Samples and HeLa Cells"],"prefix":"10.1002","volume":"6","author":[{"given":"Jos\u00e9","family":"Garc\u00eda\u2010Calvo","sequence":"first","affiliation":[{"name":"Department of Chemistry, Faculty of Science University of Burgos  09001 Burgos Spain"}]},{"given":"Saturnino","family":"Ibeas","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Faculty of Science University of Burgos  09001 Burgos Spain"}]},{"given":"Eva\u2010Clara","family":"Ant\u00f3n\u2010Garc\u00eda","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Faculty of Science University of Burgos  09001 Burgos Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5018-4173","authenticated-orcid":false,"given":"Tom\u00e1s","family":"Torroba","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Faculty of Science University of Burgos  09001 Burgos Spain"}]},{"given":"Gerardo","family":"Gonz\u00e1lez\u2010Aguilar","sequence":"additional","affiliation":[{"name":"Centre for Applied Photonics, INESC TEC  Rua do Campo Alegre, Dpto. 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