Liquid Chromatographic Detection of Dowtherm A Contamination in Oleochemicals and Edible Oils

Autor:	Felix Mee Ho Moh, Thin Sue Tang
Rok vydání:	1999
Předmět:	Pharmacology Biphenyl Detection limit Chromatography Extraction (chemistry) Fatty alcohol Fluorescence spectroscopy Analytical Chemistry chemistry.chemical_compound chemistry Environmental Chemistry Methanol Phenols Agronomy and Crop Science Food Science Eutectic system
Zdroj:	Journal of AOAC INTERNATIONAL. 82:893-896
ISSN:	1944-7922 1060-3271
DOI:	10.1093/jaoac/82.4.893
Popis:	A rapid and direct liquid chromatographic (LC) technique is described for the determination of a eutectic mixture of diphenyl oxide and biphenyl such as Dowtherm A thermal heating fluid (THF) in oleochemicals and palm olein. Analysis is performed with an RP-18 column with fluorescence detection (excitation at 247 nm and emission at 310 nm). The isocratic mobile phase (1.0 mL/min) consists of methanol and water (90 + 10, v/v). A linear calibration model (correlation coefficient = 0.9999) was developed directly from used Dowtherm A THF with the biphenyl peak (4.70 min) as a marker. Average recoveries from spiked glycerin, fatty alcohol mixture, methyl ester mixture, fatty acids, and palm olein were 90.9–108.7%, with a detection limit of 0.1 μg/mL. The technique requires no prior sample cleanup nor extraction steps and is good for quality assurance purposes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::acbb3a664f5abd3221c16e8cee5311fa https://doi.org/10.1093/jaoac/82.4.893 Zobrazit plný text záznamu