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Linear nonylphenol (4- n -NP), nonylphenol isomers (NP), and NP short chain ethoxylated derivates (NPEO 1  and NPEO 2 ) show a well-reported endocrine disrupting activity due to their ability to mimic natural estrogens of living organisms. In this work, two methodologies were developed for the simultaneous extraction and determination of NP, 4- n -NP, long and short chain nonylphenol ethoxylates in commercial powdered milk infant formula using high performance liquid chromatography with fluorescence detection (HPLC-FL). Separation was performed on an Eclipse XDB-C 8  column (3 µm and 4.6 × 150 mm) in isocratic mode at 1 mL/min using a mixture of ACN-H 2 O (65:35). In the first approach, milk powder was reconstituted according to the indications of the manufacturer. A saponification step was carried out to remove triacylglycerols and, subsequently, the obtained solution was solid-phase extracted. Following this procedure, quantitative recovery and high selectivity were achieved for 4- n -NP, whereas several interferences appeared at the retention times of NPEO x , thus increasing limits of detection for these compounds.

Determination of Nonylphenol and Nonylphenol Ethoxylates in Powdered Milk Infant Formula by HPLC-FL