Trace determination of bisphenol A and phytoestrogens in infant formula powders by gas chromatography-mass spectrometry

Han Wen Kuo, Wang Hsien Ding

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121 Scopus citations

Abstract

This investigation describes a reliable and sensitive method for simultaneously determining bisphenol A (BPA) and two major phytoestrogens, daidzein and genistein, in powdered milks and infant formulas by gas chromatography-mass spectrometric analysis after trimethylsilylation. To reduce the matrix interference associated with the constituents of the formulas, the dissolved formula solutions were firstly ultra-centrifuged and the analytes in the supernatant were then extracted using a C18 solid-phase extraction column. The accuracy and precision of the method were determined and the technique was successfully employed to measure trace concentrations of BPA, daidzein and genistein in powdered formulas. The results show that BPA, daidzein and genistein were detected in all the testing samples (n=6) at concentrations from 45 to 113ng/g (except one infant formula), 20 to 2050ng/g and 21 to 6510ng/g, respectively. The highest concentrations of daidzein and genistein (i.e., 2050 and 6510ng/g) were detected in a soy-based powdered infant formula. The quantitation limits were 1.0ng/g for BPA, and 10ng/g for daidzein and genistein using 0.5g powdered milk samples.

Original languageEnglish
Pages (from-to)67-74
Number of pages8
JournalJournal of Chromatography A
Volume1027
Issue number1-2
DOIs
StatePublished - 20 Feb 2004

Keywords

  • Bisphenol A
  • Endocrine disrupters
  • Food analysis
  • Infant formulas
  • Phenols
  • Phytoestrogens

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