• Home
  • Search Results
  • Enhanced screening efficiency for endocrine-disrupting chemicals in milk and powdered milk using UPLC/QTOF-MS by the introduction of dansyl chloride derivatisation.

Enhanced screening efficiency for endocrine-disrupting chemicals in milk and powdered milk using UPLC/QTOF-MS by the introduction of dansyl chloride derivatisation.

Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment (2012-09-12)
He-Xing Wang, Ying Zhou, Qing-Wu Jiang
ABSTRACT

This study developed and validated a sensitive analytical method for simultaneous screening of four classes of endocrine-disrupting chemicals (i.e. progestogens, androgens, oestrogens and phenols) in milk and powdered milk using ultra-performance liquid chromatography (UPLC) coupled with electrospray ionisation quadrupole time-of-flight mass spectrometry (QTOF-MS). Dansylation of oestrogens and phenols enhanced the ionisation efficiency and shifted the ionisation mode from negative to positive, which allowed for the simultaneous analysis of four EDCs in one chromatographic run. An efficient sample pre-treatment minimised the matrix effects. The mass errors for the precursor and product ions for 26 target compounds varied between -2.8 and 2.3 mDa; and the limits of detection (signal-to-noise ratio = 3) for milk and powdered milk were less than 0.04 µg l(-1) and 0.10 µg kg(-1), respectively. The proposed method was successfully used to analyse multiple types of real samples, including normal temperature whole milk, infant formula and whole powdered milk. In 11 samples, two target compounds, progesterone and androstenedione, were detected. The progesterone concentrations ranged from 8.1 to 12.7 µg l(-1) in milk, and from 1.2 to 32.0 µg kg(-1) in infant formulas and whole powdered milks. The androstenedione concentrations varied from 0.39 to 0.79 µg l(-1) in milks, and from 0.29 to 1.2 µg kg(-1) in infant formulas and whole powdered milks. Two post-target compounds, one isomer of oestriol and 5α-dihydroprogesterone, were tentatively identified by post-target analysis in two of 11 real samples.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Dansyl chloride, BioReagent, suitable for amino acid labeling, powder and chunks, ≥99% (HPLC)
Sigma-Aldrich
Dansyl chloride, BioReagent, suitable for fluorescence, ≥99.0% (HPLC)

Social Media

LinkedIn icon
Twitter icon
Facebook Icon
Instagram Icon

MilliporeSigma

Research. Development. Production.

We are a leading supplier to the global Life Science industry with solutions and services for research, biotechnology development and production, and pharmaceutical drug therapy development and production.

© 2021 Merck KGaA, Darmstadt, Germany and/or its affiliates. All Rights Reserved.

Reproduction of any materials from the site is strictly forbidden without permission.