{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,9]],"date-time":"2026-07-09T23:29:32Z","timestamp":1783639772018,"version":"3.55.0"},"reference-count":25,"publisher":"Wiley","license":[{"start":{"date-parts":[[2018,11,8]],"date-time":"2018-11-08T00:00:00Z","timestamp":1541635200000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["International Journal of Analytical Chemistry"],"published-print":{"date-parts":[[2018,11,8]]},"abstract":"<jats:p>Formaldehyde is one of the most dangerous chemical compounds affecting the human health; exposure to it from food may occur naturally or by intentional addition. In this study a high performance liquid chromatography method for determination of formaldehyde in dairy products was described. The dairy samples were reacted and extracted with a warmed organic solvent in the presence of derivatizing agent 2,4-dinitrophenylhydrazine (DNPH) and formaldehyde; the mixture was centrifuged and followed by diode array detection. The method is validated and gives average recovery of formaldehyde at the three different levels 0.1, 5.0, and 10.0\u2009mg\/kg varied between 89% and 96%. The method is linear from the limit of quantification 0.1\u2009mg\/kg up to 10\u2009mg\/kg levels. This method is intended for formaldehyde analyses in dairy products simply with stable derivatization, minimum residue loss, excellent recovery, and accurate results with a sensitive limit of detection 0.01\u2009mg\/kg. 90 dairy samples from milk, cheese, and yogurt were investigated from seven Egyptian governorates and all samples were free from formaldehyde.<\/jats:p>","DOI":"10.1155\/2018\/2757941","type":"journal-article","created":{"date-parts":[[2018,11,8]],"date-time":"2018-11-08T23:32:01Z","timestamp":1541719921000},"page":"1-5","source":"Crossref","is-referenced-by-count":23,"title":["Determination of Formaldehyde by HPLC with Stable Precolumn Derivatization in Egyptian Dairy Products"],"prefix":"10.1155","volume":"2018","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3633-8164","authenticated-orcid":true,"given":"Ahmed Salem","family":"Sebaei","sequence":"first","affiliation":[{"name":"QCAP Laboratory, Agricultural Research Center, Ministry of Agriculture, Giza, 12311, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ahmed M.","family":"Gomaa","sequence":"additional","affiliation":[{"name":"QCAP Laboratory, Agricultural Research Center, Ministry of Agriculture, Giza, 12311, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. 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